Troubleshooting Refrigerator Problems:

Warm Refrigerator: If your refrigerator isn’t cooling adequately, check the temperature settings and ensure the vents aren’t blocked. Regularly cleaning the condenser coils is crucial for enhancing efficiency and overall performance.
Strange Noises: Unusual noises can be due to a faulty fan or a malfunctioning compressor. Inspect and replace these components if necessary, or seek professional help.
Water Leakage: Check the water supply line and the drain pan for clogs or leaks. Clear the drainpipe and ensure proper alignment of the water line.

Troubleshooting Freezer Problems:

Frost Buildup: Check the door gasket for damage or debris if frost accumulates rapidly. Replace the gasket if needed to maintain a proper seal.
Freezer not Freezing: Check the thermostat settings and ensure the door closes securely. Also, verify that the evaporator coils are free of frost or ice buildup.
Inadequate Ice Production: Inspect the ice maker for any blockages or malfunctions. Replace the water filter regularly to ensure optimal ice production.

Troubleshooting Wine Cooler Problems:

Fluctuating Temperatures: Verify that the wine cooler is level and away from heat sources. Inspect the door seal thoroughly for any gaps or signs of damage.
Vibration or Noise: Wine coolers should operate quietly. Ensure that it’s on a stable surface and away from vibrating appliances.
Humidity Issues: Maintain proper humidity levels by not overcrowding the wine cooler and storing corkscrews horizontally.

Prioritize safety above all else! Remember to always unplug your appliance before attempting any troubleshooting or repairs. Suppose the issue appears too intricate or hazardous to tackle on your own. In that case, it’s best to seek assistance from a qualified Sub Zero repair technician.

Following these troubleshooting tips, you can often independently resolve common appliance issues, saving time and money. Wishing you a seamless troubleshooting experience, and may your Sub Zero appliances continue to bring convenience and joy to your everyday life!

SUB-ZERO ERROR CODES EXPLAINED

Error codes can be frustratingly vague, providing a general idea of the issue and where to investigate. With hundreds of codes for various models, you can delve deep into diagnostic mode, but time constraints often prevent thorough exploration.

Vacuum Condenser Error

Around the late 1990s, sub-zero came out with the 600 series unit. It had one or two general error codes. One of which, most common, was the “Vacuum Condenser” error code or a general “service” error code. As the years progressed, the error codes got more specific and detailed. The machines even began storing historical temperature data. It can get quite complicated, but the error codes can give a good idea of what is wrong with your machine or what to check for. At best, error codes act as a starting point for a proper diagnosis.

Vacuum Condenser:

From 1998 to 2002, 600 series units occasionally displayed a general error code. The theory behind this was that the control board would track the run times of the compressors; if they exceeded the desired limit or operated inefficiently, the control board would flash the message “Vacuum Condenser.” This error code is general because a machine can run inefficiently for countless reasons. To begin troubleshooting, your first step should be to clean the dust from your condenser. In some cases, this simple action can resolve the machine’s inefficiency. However, it should be noted that this is a relatively rare occurrence, happening less than 10% of the time.

Suppose the solution does not resolve your issue. In that case, it signifies that the machine is inefficiently operating due to another underlying cause. Rest assured; we have encountered and resolved many challenges and complications.

A few reasons we commonly see units triggering this message are as follows:

Refrigerant Leaks
Bad Fans
Rotten Door Seals & Gaskets
Defrost Issues & Frost Ups
Old Compressors & Clogged Heat exchangers
Severely Clogged Condensers with grease or bent fins.

In conclusion, contacting your service provider regarding an unclear vacuum condenser light and ineffective general vacuuming is best if temperature loss persists. If you’re located in the Houston area, we are your trusted experts to handle this matter.

Besides the Vacuum Condenser light, the early 600 series units often had the “service” light illuminated. The service light would typically turn on if there were a communication issue between the board and one of its thermistor sensors or if the ice maker solenoid had been energized for too long. To reset the code, toggle the on/off button. However, suppose the code reappears or you notice any irregularities in the ice maker system. In that case, calling a service technician for diagnosis is best. Otherwise, go ahead and reset it and observe how it behaves (it usually comes back).

Moving On: EC (ERROR CODES)

Although the Vacuum Condenser light was helpful, it’s now 2023, and the appliance industry has embraced new computer technology. To take it further, they introduced “EC Codes” to provide insights into fridge malfunctions. These error codes were implemented across various product lines, including the 600 series, 700 series, Pro48, and 400 series wine coolers. When a unit flashed “service,” it would transition to the “EC” code. However, finding accurate explanations online for these codes proved challenging. In light of this, I will share some official error code explanations and offer my approach. Starting from serial number 181, most sub-zero fridges have a more advanced diagnostic mode. To access it, Press and hold the “colder” and “unit on/off” buttons simultaneously, then release them. This will grant you access to the diagnostic mode.

Standard Sub-Zero Error Codes: Meanings & Fixes

Sub-Zero refrigerators stand out as top-of-the-line appliances in the market, renowned for their exceptional food preservation and cutting-edge technology. Yet, encountering Sub-Zero error codes can be exasperating.

These error codes span from prolonged compressor run times to defrost cycles that are not adequately warming up. Fortunately, many of these codes can be resolved swiftly through simple troubleshooting steps, such as ensuring proper door closure or cleaning the condenser.

We have compiled a comprehensive list of the most common Sub-Zero error codes and their respective meanings and troubleshooting guidelines for your convenience.

The digital control panel on the top edge of the refrigerator houses the Sub-Zero error codes, as illustrated in the image above. These codes serve as indicators for any malfunctions or issues that may arise.

Share This Tip

Although Sub-Zero refrigerators rarely experience malfunctions, their error codes prove invaluable when troubleshooting occasional issues. One frequently encountered error code is EC24, which signifies a defrost system problem. To restore optimal functionality, consider cleaning the condenser coils. Delve into a comprehensive list of standard error codes and their corresponding meanings to effectively decode and resolve Sub-Zero refrigerator complications.

Making Sense of Sub-Zero Refrigerator Error Codes

Every error code on a Sub-Zero refrigerator is associated with a distinct issue. Understanding the meaning of each code helps pinpoint the problem and decide whether a simple adjustment or professional repair is required.

Error Code Guide for SUB-ZERO 400 Series Refrigerators

SUB-ZERO 400 series refrigerators are renowned for their performance and reliability. However, like any complex appliance, they occasionally experience issues that manifest as error codes. These error codes serve as valuable diagnostic tools to help identify and address potential problems. Below is a comprehensive guide to the error codes you may encounter on your SUB-ZERO 400 series refrigerator and their corresponding meanings.

05 – Upper Cabinet Thermistor Issue
This error code indicates that the Upper Cabinet Thermistor has detected an open or short circuit that persists for over 10 seconds. Alternatively, it may be reporting consistently fluctuating temperatures. A malfunction in this component can affect the accuracy of temperature control in the upper cabinet.

06 – Upper Evaporator Thermistor Issue
Similar to the previous code, error code 06 points to a problem with the Upper Evaporator Thermistor. It signals an open or short circuit lasting more than 10 seconds, or it may detect erratic temperature fluctuations. Addressing this issue promptly is crucial to maintaining optimal cooling performance.

07 – Lower Cabinet Thermistor Issue
Error code 07 indicates a potential problem with the Lower Cabinet Thermistor. It identifies an open or short circuit lasting more than 10 seconds or may provide inconsistent temperature readings. The proper functioning of this thermistor is essential for accurate temperature regulation in the lower cabinet.

08 – Evaporator Thermistor Issue
Error code 08 relates to the Evaporator Thermistor. It alerts you to a situation where the thermistor reading is either constantly open or short for more than 10 seconds or if it is exhibiting repeated erratic temperature fluctuations. Ensuring the proper operation of the evaporator thermistor is crucial for efficient cooling.

10 – Elevated Temperature in Upper Cabinet
This error code serves as an alarm, notifying you of elevated temperatures in the upper cabinet. It is crucial to promptly address this issue to prevent potential spoilage of perishable items stored in this section. Ensuring timely attention will safeguard the quality and freshness of the stored items.

11 – Cold Temperature in Upper Cabinet
On the opposite end of the spectrum, error code 11 alerts you to frigid temperatures in the upper cabinet. This could impact the quality of stored items and may require temperature adjustment.

12 – Warm Temperature in the Lower Cabinet
Error code 12 indicates that the lower cabinet detects warmer temperatures than desired. Prompt attention is needed to prevent food safety concerns and ensure proper cooling performance.

13 – Low Temperature in the Lower Cabinet
Conversely, error code 13 signals abnormally low temperatures in the lower cabinet. This could affect the freshness and quality of stored items, necessitating corrective action.

15 – Sealed System Fault Detected
This error code points to a potential issue with the sealed system. It detects a situation where the evaporation temperature cannot decrease by 5° within 5 minutes, accompanied by three consecutive valve activations. Addressing sealed system faults is crucial to maintaining the refrigerator’s cooling efficiency.

30 – Temperature Data (Illuminated)
This code provides temperature data for a 2-hour average recorded by a thermistor on the left and its respective index number. The index numbers allow you to monitor temperature trends over time.

50 – Excessive Refrigerator Compressor Operation
Error code 50 indicates that the refrigerator compressor is running excessively. This could be due to various factors, including improper temperature settings or a malfunctioning component.

60 – Average Temperature Display
Code 60 displays the average temperature over 4 hours, with corresponding index numbers. It allows you to track temperature trends and identify any fluctuations.

66 – Power Failure or Interruption
This code illuminates the BELL ON sign and indicates a power failure or interruption. It serves as a notification that the refrigerator has experienced a loss of power.

68 – SERVICE Light Illuminated
When the SERVICE light is illuminated, it indicates that the unit was turned off using the UNIT ON/OFF key. This may be done during maintenance or servicing.

SUB-ZERO 600 Series Error Codes and Troubleshooting

INTRODUCTION
This 600 Series Technical Service/Training Manual supplement is designed to provide up-to-date information and guidance on safety, installation, set-up, design, operation, features, troubleshooting, wiring diagrams, and repair procedures for 600 Series units starting with serial #1810000. With these insights, service technicians can efficiently identify malfunctions, perform necessary repairs, and restore optimal functionality.

Service technicians must familiarize themselves with the complete instructions in this appendix before initiating any repairs on a 600 Series unit starting with serial #1810000. The SUB-ZERO 600 Series is renowned for its exceptional quality; however, even the most advanced refrigerators can experience issues. By referring to these error codes, technicians can gain valuable insights and effectively troubleshoot potential problems. Explore the exceptional performance and reliability of the SUB-ZERO 600 Series!

IMPORTANT SAFETY INFORMATION
Below are the Product Safety Labels used in this manual. The “Signal Words” used are WARNING or CAUTION. When reviewing this manual, please note these different Product Safety Labels at the beginning of certain sections. You must follow the instructions in the boxes below the Product Safety Labels to avoid personal injury and product damage.

The sample Product Safety Labels below illustrate the precautions when the signal word is observed.

WARNING (RED)
INDICATES THAT HAZARDOUS OR UNSAFE PRACTICES COULD RESULT IN SEVERE PERSONAL INJURY OR DEATH

WARNING (YELLOW)
Indicates that hazardous or unsafe practices could result in minor personal injury or product and/or property damage

In addition, please pay attention to the signal word“NOTE,” which highlights information that is especially important for the topic being covered

Error Code 05: Refrigerator Cabinet Thermistor Issue
This code indicates that the refrigerator cabinet’s thermistor has been detected as open or shorted for over 10 seconds. It may also suggest consistently erratic temperature readings. This could affect cooling performance and needs prompt attention.

Error Code 06: Evaporator Thermistor Problem
When the evaporator thermistor exhibits prolonged open or short readings for over 10 seconds or displays repeated erratic temperature readings, Error Code 06 will be triggered. Addressing this is essential to maintain proper cooling in the refrigerator.

Error Code 07: Freezer Cabinet Thermistor Issue
Similar to Code 05, Error Code 07 indicates that the freezer cabinet’s thermistor has read open or shorted for more than 10 seconds or has consistently displayed erratic temperature readings. Ensuring the freezer’s cooling efficiency requires addressing this error.

Error Code 08: Freezer Evaporator Thermistor Problem
Code 08 arises when the freezer evaporator thermistor reads open or shorted for more than 10 seconds or displays repeated erratic temperature readings. This can affect freezing capabilities and should be resolved promptly.

Error Code 20: Defrost Underheat with No Voltage Feedback
This error points to defrost underheating with no voltage feedback through the gray/white wire at defrost start. It signifies an issue with the defrost cycle, potentially leading to frost buildup on the evaporator coils.

Error Code 21: Defrost Overheat
Error Code 21 indicates that the defrost cycle has experienced overheating. This could be due to various factors and might cause inefficient cooling if not resolved.

Error Code 22: No Voltage Feedback Through Gray / White Wire
This error indicates a lack of voltage feedback through the gray/white wire at the defrost start. It could disrupt the defrost cycle and lead to problems with temperature regulation.

Error Code 23: Defrost Overheat with No Voltage Feedback
Similar to Code 21, Error Code 23 signifies a defrost overheat situation. However, it adds the issue of no voltage feedback through the gray/white wire, requiring thorough inspection and corrective action.

Error Code 24: Defrost Underheat
When the defrost cycle underheats, Error Code 24 will appear. This could result in frost buildup on the evaporator coils, leading to cooling inefficiency.

Error Code 30: Excess Ice Maker Water Valve Solenoid Activation
Error Code 30 indicates excessive ice maker water valve solenoid activation lasting more than 15 seconds. This could lead to overfilling the ice maker, causing leaks or ice clumping.

Error Code 40: Excessive Freezer Compressor Run
When the freezer compressor runs excessively, it triggers Error Code 40. This could suggest issues with temperature regulation, potentially affecting both freezer and refrigerator compartments.

Error Code 50: Excessive Refrigerator Compressor Run
Error Code 50 points to the excessive operation of the refrigerator compressor. This could indicate cooling inefficiency and requires attention to ensure proper temperature maintenance.

SUB-ZERO 700 Series Error Codes and Troubleshooting

The SUB-ZERO 700 Series is renowned for its advanced features and exceptional performance. However, like any complex appliance, it may encounter occasional errors. Understanding the error codes and their meanings is crucial for diagnosing and resolving issues effectively. Here’s a comprehensive list of error codes, along with their explanations and troubleshooting steps:

Error Code 05 – Refrigerator Cabinet Thermistor Issue
Description: Refrigerator cabinet thermistor read open, short, or erratic temperature for 10+ seconds.
Troubleshooting: Check the refrigerator cabinet thermistor wiring and connections. Replace the thermistor if necessary.

Error Code 06 – Refrigerator Evaporator Thermistor Issue
Description: Refrigerator evaporator thermistor read open, short, or erratic temperature for 10+ seconds.
Troubleshooting: Inspect the refrigerator evaporator thermistor wiring and connections. Replace the thermistor if needed.

Error Code 07 – Freezer Cabinet Thermistor Issue
Description: Freezer cabinet thermistor read open, short, or erratic temperature for 10+ seconds.
Troubleshooting: Examine the freezer cabinet thermistor wiring and connections. Consider replacing the thermistor if required.

Error Code 08 – Freezer Evaporator Thermistor Issue
Description: Freezer evaporator thermistor read open, short, or erratic temperature for 10+ seconds.
Troubleshooting: Check the freezer evaporator thermistor wiring and connections. Replace the thermistor if warranted.

Error Code 20 – Defrost Underheat and No Feedback
Description: Defrost underheat detected, and no feedback through the Green/White wire at defrost start.
Troubleshooting: Inspect the Green/White wire connections at defrost start. Ensure proper communication and connection.

Error Code 21 – Defrost Overheat
Description: Defrost overheating detected.
Troubleshooting: Verify the defrost heater and sensor. Ensure that they are functioning correctly and, if needed, replace them.

Error Code 22 – No Feedback at Defrost Start
Description: No feedback was detected through the Green/White wire at the defrost start.
Troubleshooting: Check the Green/White wire connections at defrost start. Ensure proper communication and connection.

Error Code 23 – Defrost Overheat and No Feedback
Description: Defrost overheating detected, and no feedback through the Green/White wire at defrost start.
Troubleshooting: Verify the defrost heater and sensor functionality. Examine the Green/White wire connections.

Error Code 24 – Defrost Underheat
Description: Defrost underheat detected.
Troubleshooting: Inspect the defrost heater and sensor. Ensure they are operating as expected and replace them if necessary.

Error Code 80 – High Compressor Differential Pressure or Low Voltage
Description: High variable speed (VS) compressor differential pressures or low voltage supplied to VS compressor.
Troubleshooting: Check for any pressure or voltage irregularities. Address the issue and ensure proper compressor operation.

Error Code 81 – High Amperage Draw at VS Compressor
Description: High amperage draw observed at the VS compressor.
Troubleshooting: Inspect the compressor and associated components for any anomalies. Consider replacing components if needed.

Error Code 82 – VS Compressor Couldn’t Maintain Minimum Speed
Description: VS compressor couldn’t maintain minimum speed at the highest current draw.
Troubleshooting: Verify the compressor’s performance and functionality. Please address any issues affecting its speed regulation.

Error Code 83 – Locked VS Compressor Rotor
Description: The Rotor of the VS compressor is locked.
Troubleshooting: Address the rotor lock issue, which could involve mechanical or electrical factors.

Error Code 84 – Short Circuit at VS Compressor Controller Output Circuit
Description: Short circuit detected at the VS compressor controller output circuit.
Troubleshooting: Inspect the circuit for any short-circuiting. Repair or replace components as needed.

Error Code 85 – VS Compressor Inverter Overheating
Description: VS compressor inverter overheated, leading to VS compressor shutdown.
Troubleshooting: Address the overheating issue, which may involve improving ventilation or checking for component malfunctions.

Error Code 86 – Serial Communication Failure between VS Compressor Controller and Electronic Control Board
Description: Serial communication failure between the VS compressor controller and electronic control board.
Troubleshooting: Examine the communication link and connections between the components. Ensure proper communication.

Error Code 87 – Out-of-Spec Speed Information
Description: Speed information from the electronic control board is out of specification.
Troubleshooting: Address any speed-related discrepancies or malfunctions in the control board.

Error Code 88 – Electronic Control Board Not Receiving Status Data
Description: Electronic control board not receiving status data in response to speed commands.
Troubleshooting: Check the communication between the control board and other components. Address any communication issues.

SUB-ZERO 648 PRO & ICB648 PRO Error Codes and Troubleshooting Guide

Welcome to our comprehensive SUB-ZERO 648 PRO and ICB648 PRO error codes guide. This guide will provide a detailed list of error codes and troubleshooting instructions to help you address these issues effectively.

Error Codes and Troubleshooting

01 X Zone “X” Cabinet Thermistor Failure (Device or Wiring)
If you encounter error code 01, it indicates a potential issue with the cabinet thermistor in a specific zone. Start by inspecting the thermistor device and Wiring for any signs of damage. Replace or repair as needed to resolve the problem.

02 X Zone “X” Evaporator Thermistor Failure (Device or Wiring)
Error code 02 indicates a possible evaporator thermistor problem in a particular zone. Examine the thermistor device and Wiring for any faults. Address any issues with replacement or repairs.

03 X Zone “X” Condenser Thermistor Failure (Device or Wiring)
Error code 03 suggests a condenser thermistor concern in a specific zone. Carefully assess the thermistor device and Wiring for any issues. Replace or repair to rectify the error.

04 0 Ambient Thermistor Failure (Device or Wiring)
If you see error code 04, it indicates a potential problem with the ambient thermistor. Inspect the thermistor device and Wiring for any issues. Make sure to address any faults accordingly.

20 X Check Zone “X” Defrost Bi-metal for Proper Operation
For error code 20, checking the defrost bi-metal for proper operation in the specified zone is advisable. Ensure that the bi-metal is functioning as intended to avoid further complications.

21 X Check Zone “X” Defrost Bi-metal for Proper Operation
Similarly, error code 21 prompts you to assess the defrost bimetal’s proper operation in the indicated zone. Verify its functionality to prevent potential issues.

22 X Check Zone “X” Defrost Wiring
Error code 22 points to a potential concern with the defrost Wiring in a specific zone. Thoroughly examine the Wiring for any faults or damage. Address any issues promptly.

23 X Check Zone “X” Defrost Wiring
Likewise, error code 23 highlights a potential problem with the defrost Wiring in the specified zone. Take the time to inspect and address any wiring issues accordingly.

24 X Check Zone “X” Defrost Heater Ohms
If you encounter error code 24, checking the defrost heater’s ohms in the indicated zone is crucial. Ensure the heater is functioning within the expected parameters.

30 0 Check for Stuck Icemaker or Water Valve Failure
Error code 30 indicates the need to check for a stuck icemaker or potential water valve failure. Examine the icemaker and water valve components for any obstructions or malfunctions.

35 X Check Zone “X” Fan, Fan Speed Error
For error code 35, assess the fan and fan speed in the specified zone. Verify that the fan is operating correctly and adjust the speed as needed.

40 X Zone “X” Excessive Run
Error code 40 suggests excessive run time in a specific zone. Ensure proper cooling and investigate the cause of extended operation.

41 X Check Zone “X” Compressor and Wiring
When encountering error code 41, inspecting the compressor and associated Wiring in the indicated zone is essential. Address any compressor or wiring issues promptly.

42 0 Check Condenser Fan and Wiring
Error code 42 prompts you to check the condenser fan and Wiring. Ensure the fan is functioning correctly and examine the Wiring for any faults.

43 X Check Left Refrigerant Valve and Wiring
For error code 43, assess the left refrigerant valve and its Wiring. Ensure proper operation and address any wiring concerns.

44 X Check Zone “X” Glass Door Heater and Wiring
If you see error code 44, it indicates the need to check the glass door heater and associated Wiring in the specified zone. Verify proper functionality and address any wiring issues.

45 X Errors Detectable with Red Door Switches-Disabled Now. Check Overhead Lighting
Error code 45 suggests checking overhead lighting due to the disabled red door switches. Ensure proper lighting functionality for accurate error detection.

46 0 Check Ice Accessory Wiring for Open Circuit
For error code 46, inspect the ice accessory wiring for open circuits. Address any open circuits to prevent potential issues.

47 3 Check Accent Lighting Wiring for Short Circuit
Error code 47 prompts you to check accent lighting wiring for potential short circuits. Sift through the Wiring and address any short circuits.

80 X Check Power to Compressor Controller for Zone “X,” Troubleshoot with Manual Activation Mode
Error code 80 requires checking the power to the compressor controller in the specified zone. Troubleshoot using manual activation mode to identify and address any power-related issues.

83 X Replace Zone “X” VS Compressor and Filter-Drier
When encountering error code 83, replace the variable-speed (VS) compressor and filter-drier in the indicated zone to ensure proper functionality.

84 X Check Zone “X” VS Compressor Wiring
Error code 84 indicates the need to check the variable-speed (VS) compressor wiring in the specified zone. Examine the Wiring for any faults and address them accordingly.

85 X Zone “X” VS Compressor Control Overheat
For error code 85, promptly address zone-specific variable-speed (VS) compressor control overheat issues. Ensure proper cooling and functionality.

86 X Check Communication Wiring, Replace Zone “X” VS Controller
Error code 86 requires checking communication wiring and potentially replacing the variable-speed (VS) controller in the indicated zone. Address any communication or controller concerns.

87 X Check for Broken Wiring or Open Defrost Heater
If you encounter error code 87, inspect for broken Wiring or open defrost heater issues. Address any wiring or heater concerns promptly.

89 X Check Icemaker Solenoid Valve and Wiring
Error code 89 prompts you to check the icemaker solenoid valve and its Wiring. Ensure proper operation and address any wiring issues.

90 X Change Main Control Board
For error code 90, replace the main control board to address potential control-related issues and restore proper functionality.

92 0 Check Keypad Wiring
Error code 92 requires checking keypad wiring for any faults or issues. Thoroughly examine the Wiring to ensure proper connection.

93 0 Replace Keypad
If you see error code 93, replace the keypad to address potential control interface problems and restore accurate input functionality.

94 1 Check Wiring / Replace User Display #1
Error code 94 indicates the need to check Wiring or replace user display #1. Inspect the wiring and display components for any issues.

94 3 Check Wiring / Replace User Display #2
Similarly, error code 94 (3) suggests checking Wiring or replacing user display #2. Address any wiring or display concerns accordingly.

96 0 Datalogger Malfunction
Error code 96 indicates a datalogger malfunction. Address the malfunction to ensure accurate data recording and analysis.

97 0 Check Communications Cables / Connectors
For error code 97, check communications cables and connectors for proper connection and functionality.

98 0 Brownout Check Input Power Supply
Error code 98 prompts you to perform a brownout check on the input power supply. Ensure a stable power supply for optimal performance.

Sub-Zero Refrigerator And Freezer Error Codes

If your Sub-Zero refrigerator is showing an error code, worry not! Sub-Zero refrigerators have advanced diagnostic systems that detect and display faults or error codes. These codes can be found inside the refrigerator near the temperature controls or on the display screen where the usual numbers reside.

When an error code appears, your refrigerator specifically indicates a fault. However, suppose you’re unable to fix the error yourself. In that case, it’s time to call a repair technician who can resolve the issue. Rest assured, your refrigerator will be up and running smoothly again soon!

To reset your refrigerator and clear the error code, Press and hold the door-ajar alarm key for 15 seconds. If the error persists, it indicates a problem with the refrigerator.

Sub-Zero Refrigerator 400-2 and 427r-2 Error Codes: Decoding and Troubleshooting

Sub-Zero Refrigerator 400-2 and 427r-2 are renowned for their performance and reliability. However, like any complex appliance, they may encounter errors that warrant attention. Understanding these error codes and their causes is crucial for maintaining optimal functionality. Below, we delve into the error codes you might encounter, their causes, and recommended troubleshooting steps.

Error Code: EE Service (Flashing)
Cause: This error code indicates a fault with the refrigerator compartment thermistor. The thermistor is crucial in monitoring and regulating the temperature within the refrigerator compartment.
Solution: To resolve this error, it’s essential to address the thermistor fault. Inspect the thermistor for any visible damage or connection issues. If necessary, replace the faulty thermistor. After fixing the component, turn the unit OFF and back ON to clear the error code. Additionally, pressing the bell ON/OFF key for 15 seconds can help clear the error.

Error Code: 38 Service (Flashing)
Cause: Error code 38 can be triggered by several excessive compressor run times or a fault in the Sub-Zero Refrigerator’s evaporator thermistor. The compressor run times refer to how often the compressor operates to maintain the desired temperature.
Solution: If this error is due to excessive compressor run times, assessing the unit’s cooling efficiency is essential. Check the refrigerator’s temperature settings and ensure they are appropriate for the contents. If a faulty evaporator thermistor causes the error, inspect the thermistor for damage or connectivity issues. Replace the thermistor if needed. After addressing the cause, turn the unit OFF and ON to clear the error.

Error Code: 38 Service (Steady, not Flashing)
Cause: Similar to the flashing error code 38, a steady error code 38 can result from several excessive compressor run times or a fault in the Sub-Zero Refrigerator’s evaporator thermistor.
Solution: Follow the above steps for error code 38 flashing to resolve this issue. Begin by assessing compressor run times and adjusting temperature settings if necessary. Inspect the evaporator thermistor for faults and replace it if required. To the error code, power off the unit, then power it back on. Additionally, try pressing the bell ON/OFF key for 15 seconds.

Sub Zero Refrigerator 600 Series (Pre Serial #1810000) Error Codes

EE Service (Flashing) 38: Indicates a fault with the SubZero Freezer compartment thermistor.

00 Service (Flashing) EE: Points to a SubZero Refrigerator compartment thermistor fault.

00 ICE (Flashing) 38: When the water valve energizer remains active for over 15 seconds, the Sub-Zero icemaker system is disabled. A 45-minute halt time follows each ice maker cycle, during which no power is supplied to the ice maker. To bypass the 45-minute dwell switch, turn the unit OFF and back ON.

Sub Zero Refrigerator Freezer 600 Series (Starts With Serial #1810000)

EE Service (Flashing) 38: Indicates an issue with the SubZero Freezer compartment thermistor.

00 Service (Flashing) EE: Points to a problem with the SubZero Refrigerator compartment thermistor.

00 Service (Flashing) 38: Signifies excessive compressor run periods or a SubZero refrigerator evaporator thermistor fault.

00 Ice (Flashing) 38: Indicates that the water valve has been energized for more than 15 seconds, leading to the disabling of the Sub-Zero icemaker system.

Sub-Zero Refrigerator Freezer 600-2 SERIES

Error Code: EE Service (Flashing) 38
Cause: Faulty thermistor in the SubZero Freezer compartment.

Error Code: 00 Service (Flashing) EE
Cause: Faulty thermistor in the SubZero Refrigerator compartment.

Error Code: 00 Service (Flashing) 38
Cause: Excessive compressor run periods or SubZero Refrigerator evaporator fault.

Error Code: 00 Ice (Flashing) 38
Cause: The water valve energized for over 15 seconds, turning off the Sub-Zero icemaker system for 24 hours.

Error Code: 00 Service (Steady, not Flashing) 38
Solution: Press the bell ON/OFF key for 15 seconds to clear the error code.

Sub Zero Refrigerator Freezer 700 SERIES

If Control is Shut Off:
Press the COLDER key to restart the unit.

Error Code: -20
Meaning: Zone/Compartment thermistor fault.
Solution: Repair the wiring or replace the thermistor.

Error Code: 55
Meaning: Zone/Compartment thermistor shorted.
Solution: Repair the wiring or replace the thermistor.

Error Code: Su
Meaning: Blue wire of display cable unhooked or faulty.
Solution: Check and repair Wiring.

Error Code: -88
Meaning: Red wire of the display cable is unhooked or faulty, the top lights are off, and the keys are inoperative.
Solution: Examine and repair the wiring.

Sub-Zero Refrigerator Freezer 700-2 SERIES (Tall Units)

EE Service (Flashing) 38
Cause: Freezer compartment thermistor fault.
Solution: Check and replace the faulty thermistor in the freezer compartment.

00 Service (Flashing) EE
Cause: Refrigerator compartment thermistor fault.
Solution: Replace the defective thermistor in the refrigerator compartment.

00 Service (Flashing) 38
Cause: Excessive compressor run periods or Refrigerator evaporator fault.
Solution: Ensure the compressor runs within regular periods or inspect the refrigerator evaporator for issues

00 Ice (Flashing) 38
Cause: The water valve energized for over 15 seconds, turning off the Icemaker system.
Solution: Allow a 45-minute halt time for each ice maker cycle. To bypass, switch the unit OFF and then back ON.

SubZero Refrigerator Freezer 700-3 SERIES (TALL UNITS)

EE Service (Flashing) 38:
Cause: Faulty Thermistor in Freezer Compartment

00 Service (Flashing) EE:
Cause: Faulty Thermistor in Refrigerator Compartment

00 Service (Flashing) 38:
Cause: Excessive Compressor Run or Faulty Refrigerator Evaporator Thermistor

00 Ice (Flashing) 38:
Cause: Prolonged Water Valve Activation – Icemaker Disabled for 24 Hours

00 Service (Steady, not Flashing) 38:
Solution: Clear the Error by Pressing Bell ON/OFF Key for 15 Seconds

Are there any Sub-Zero refrigerator error codes that we haven’t still need to cover? Or are you facing difficulties with your Sub Zero fridge? Feel free to leave a question or comment below, and we’ll be glad to assist you.

SubZero Under Counter Series (SWS #3603000)

TROUBLESHOOTING GUIDES

This section of the manual contains:

The Error Code Table and the Error Code Troubleshooting Guide.
The General Troubleshooting Guide which covers all problems that a UC-24 Series unit may experience.
The Membrane Switch/Ribbon Cable Test Procedures are used to determine if a control panel assembly is defective.

EC 05 – If “EE” for the refrigerator compartment was displayed and “SERVICE” flashing, check the following:

Thermistor electrical connections and continuity from the thermistor to J5 on the control board. Reconnect/repair.
Resistance of thermistor – 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective

EC 06 – Initiate Diagnostic Mode. If “EE” is displayed for the refrigerator evaporator thermistor, check the following:

Thermistor electrical connections and continuity from the thermistor to J5 on the control board. Reconnect/repair.
Resistance of thermistor – 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.

EC 07 – If “EE” for the freezer compartment was NOT displayed, the problem is intermittent thermistor error or caused by over-heating (above 116°F), check the following:

The door is not closing correctly. Correct door closing problem.
Check light switch, wiring & electrical connections. Repair wiring/connections or replace the switch.
Check for proper mounting and location of the freezer compartment thermistor. Remount correctly.
Check electrical connections and operation of defrost terminator – Cut-in 30°F (-1°C) /Cut-out 55°F (13°C).
Reconnect/repair or replace the terminator.
Check thermistor electrical connections and continuity at J5 on the control board. Reconnect/repair.
Check thermistor resistance – 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.

EC 08 – Initiate Diagnostic Mode. If “EE” is displayed for the freezer evaporator thermistor, check the following:

Thermistor electrical connections and continuity from the thermistor to J5 on the control board. Reconnect/repair.
Resistance of thermistor – 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.

EC 20 – To maintain optimum performance in low temperatures (below 10°F / -12°C), it is recommended to defrost the system manually. After initiating Manual Defrost, enter Diagnostic Mode by pressing the POWER key every 20 seconds. Observe the evaporator temperature during this diagnostic process. An error code will be displayed if the temperature exceeds 45°F (7°C) and the defrost runs longer than 5 minutes. Clear the error code if it is determined to be false. If the error code persists, further troubleshooting is required.

Check the continuity of Grey/White wire from the defrost heater to J2 on the control board. Reconnect/repair Grey/White wire.
While in defrost, check for AC power at P2 on the control board. If there is no voltage, replace the board.
Please verify the continuity of the Blue wire extending from the defrost terminator to P2 on the control board. Proceed with the necessary steps to reconnect or repair the Blue wire.
Check the resistance of the defrost heater (see wire diagram for proper resistance). Replace the heater if defective.
Check electrical connections and operation of defrost terminator – Cut-in 30°F (-1°C) /Cut-out 55°F (13°C).
Reconnect/repair or replace the terminator.
Reference the wiring diagram to identify components in the same White wire circuit as defrost heater. Check all White wire electrical connections and continuity from the defrost heater to P4 on the control board.

EC 21 – To initiate a manual defrost with cold evaporator temperatures below 10°F (-12°C), follow these steps: start by entering diagnostic mode. Press the POWER key every 20 seconds to remain in diagnostic mode and monitor the evaporator temperature. If the temperature stays below 105°F (40.5°C), the error code is determined to be false, and it can be cleared. However, further troubleshooting may be required if the error code is false.

Check the Blue wire connection at the control board (P2). If connected to wrong pin, connect correctly.
Check the Grey/White wire connection at the control board (J2-3). if connected wrong or lousy connection, reconnect / repair.
Check for proper mounting & location of evap. thermistor, defrost heater & terminator. Remount correctly.
Check for an electrical short of Blue wire to another circuit. Repair Blue wire &/or electrical connections.
Check operation of defrost terminator – Cut-in 30°F (-1°C) /Cut-out 55°F (13°C). Replace if defective.

EC 22 – Torost your appliance in cold temperatures (less than 10°F / -12°C), follow these steps:

Initiate Manual Defrost.
Wait for 5 minutes after initiating the defrost to check the continuity from the defrost heater to J2-3 on the control board.
If the compressor starts, inspect and repair the Grey/White wire connection if necessary.

Ensure optimal performance by performing these maintenance procedures as needed.

EC 23 – To perform a manual defrost with cold evaporation (temperature below 10°F / -12°C), follow these steps:

Initiate manual defrost.
After 5 minutes, check the wire connections and continuity from the defrost heater to J2-3 on the control board.
If needed, reconnect or repair the grey/white wire.

This procedure will help optimize the performance and efficiency of your system. Make sure to perform regular maintenance to keep it running smoothly. #defrost #maintenance #HVAC

EC 24 -To initiate manual defrost with cold evaporation (below 10°F / -12°C), enter diagnostic mode by pressing the POWER key every 20 seconds. Monitor the evaporation temperature. If the temperature exceeds 45°F, the error code is incorrect. Clear the error code. If the error code is not incorrect:

Check the Blue wire connection at the control board (P2). If connected to the wrong pin, connect correctly.
Verify the proper location of the Grey/White wire at the control board (J2-3). if connected wrong or lousy connection, reconnect / repair.
Check for proper mounting & location of evap. thermistor, defrost heater & terminator. Remount correctly.

Conclusion

Sub-Zero refrigerators are designed to deliver exceptional performance, but occasional issues like the EC50 error code may arise. To promptly address excessive compressor running caused by ajar doors or dirty condenser coils, take corrective action to restore optimal functionality. However, if temperatures remain excessively high or if you encounter complex issues, it’s advisable to seek the expertise of professional Sub Zero repair services. Remember, regular maintenance and swift attention to error codes will ensure your Sub-Zero refrigerator preserves the freshness of your food and keeps your kitchen running smoothly.

Don’t hesitate to contact Appliance Cowboys for exceptional assistance! Whether you prefer to message us or conveniently schedule an appointment online, we’ve got you covered!