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Sub-Zero appliance repair tips

How To Diagnose Your Undercounter Sub-Zero Refrigerator?

How To Diagnose Your Undercounter Sub-Zero Refrigerator?

Because of their ability to be seamlessly integrated into virtually any kitchen layout without occupying additional space, under-counter refrigerators have consistently been a preferred option for homeowners looking to optimize their kitchen space.

However, as time goes by and your appliance ages, it is not uncommon to encounter occasional issues, even with the renowned reliability of Sub-Zero refrigerators. Therefore, it is essential to stay vigilant and ensure proper maintenance to prolong its lifespan and performance. Doing so allows you to continue enjoying the convenience and functionality of under-counter refrigerators in your kitchen.

With that in mind, below, we’ll go over a few simple troubleshooting steps to help you diagnose your problem and get your unit back up and running!

Temperature Issues

It’s equally frustrating whether we’re talking about a refrigerator that’s either too warm or too cold. However, temperature issues are typically quickly resolved.

Evaportator Fan Motor

If your refrigerator isn’t cooling as efficiently as it once did, it could be attributed to a faulty or malfunctioning evaporator fan motor. An evaporator fan motor is responsible for circulating cool air throughout the unit, ensuring optimal temperature distribution. To check if the fan motor is the culprit, open your fridge door and listen attentively for any signs of the fan running. With regular use and the passage of time, the fan motor undergoes wear and tear, eventually succumbing to failure and causing a decline in cooling effectiveness.

Temperature Control Thermostat

Next, a refrigerator that isn’t cooling correctly may result from a faulty compressor start relay. The start relay, a vital refrigerator component, is essential to signal the compressor when to start and stop its operations. If the start relay malfunctions, you may notice a distinct clicking or ticking noise while the compressor runs. However, diagnosing and resolving this issue requires disassembling specific components within your unit. If you are unsure about this procedure or lack the necessary expertise, we strongly recommend contacting a professional appliance technician without hesitation. Their knowledge and experience will ensure a proper and efficient resolution to the problem. So why wait? Contact a trusted technician today to address your refrigerator’s cooling performance concerns.

Start Relay

Next, if your refrigerator is not cooling correctly, it might be due to a faulty compressor start relay. The start relay plays a crucial role in instructing the compressor when it should start functioning and when it should stop. One standard indicator of a faulty relay is the presence of a clicking or ticking sound while the compressor is running. However, diagnosing and resolving this issue may require disassembling some of the components of your unit. If you are unsure how to proceed, it is highly recommended to seek assistance from a professional appliance technician who can provide expert guidance and ensure efficient resolution. Don’t wait; reach out to a trained professional today to address this concern comprehensively.

Noisy Refrigerator

They’re worse than when you hear your appliance making loud noises. It can be a real headache, especially when unsure of what’s causing it. The good news is that there are a few common culprits regarding these annoying sounds. One possibility is damaged or broken fan blades, which can create a lot of rackets. Another potential issue is a malfunctioning compressor, which can cause the appliance to make unpleasant noises. By understanding these prevalent issues, you can take proactive measures to resolve them, reinstating tranquility and calmness within your home.

Damaged Fan Blade

Begin by unplugging your unit. If possible, locate the evaporator fan and check for any visible signs of damage. You can also manually turn the fan blades by hand. Even if the blades turn, if you feel significant resistance, it is likely due to a broken bearing. In such cases, replacing the bearing becomes necessary to restore proper functionality to the unit.

Malfunctioning Compressor

Your unit’s compressor is responsible for pumping coolant through the condenser coils. When the compressor starts to malfunction or break, it’ll often result in a loud or unfamiliar noise you hear.

Refrigerator Won’t Defrost

Improper defrosting of your unit can lead to ice buildup and condensation on the condenser coils. Both of these issues can cause headaches you’d surely want to avoid. Ensure smooth operation by addressing defrosting concerns promptly.

Defrost Timer

If your appliance is not functioning as it should, don’t fret – our expert appliance repair services are here to save the day. Before contacting us, you can perform a few preliminary checks to assess the issue.

To begin, ensure your safety by unplugging the unit. Once that’s done, try locating the evaporator fan. Carefully inspect it for any evident indications of damage. You can also manually turn the fan blades to assess their smoothness. It likely indicates a broken bearing if you encounter considerable resistance or notice irregularities. This issue must be promptly addressed and replaced to restore your appliance’s optimal performance.

Sensor With Fuse

Your unit’s compressor is responsible for pumping coolant through the condenser coils. When the compressor starts to malfunction or break, it’ll often result in a loud or unusual noise you hear.


If you’re struggling to ignite the burner on your gas stovetop, the burner cap may have been dislodged during cleaning. This common occurrence can disrupt the gas flow, resulting in an uneven flame or preventing ignition altogether.

To avoid minor inconveniences while preparing your holiday feast, consistently and adequately reposition the burner caps after cleaning. This simple step will ensure a smooth cooking experience without any hiccups.

If you’re not feeling confident in your diagnostic skills, worry not! Book a schedule with us, and we’ll professionally diagnose and repair any issue with your appliance. Let us take care of the problem while you sit back and relax!


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