Viking Wine Cellar Not Cooling: Troubleshooting and... | appliancefaults.com

Technical Background:

The MCU (Microcontroller Unit) monitors the thermistor reading and controls the compressor, evaporator fan, and defrost cycle. A faulty thermistor, compressor relay, or fan motor will disrupt the cooling process. Voltage paths typically include 120V AC to the power supply board, which then provides DC voltage (usually 12V or 24V) to the fan motor and control circuits.

Symptoms:

The wine cellar is running, but the internal temperature is significantly higher than the set point. Wine is not being stored at the proper temperature and there might be condensation forming inside the unit.

Possible Causes:

Dirty Condenser Coils
Faulty Evaporator Fan Motor
Defective Thermistor
Compressor Relay Malfunction
Refrigerant Leak
Airflow Obstruction

Solution:

1

Unplug the wine cellar or disconnect power at the breaker panel.
2

Clean the condenser coils located at the rear or bottom of the unit using a vacuum cleaner with a brush attachment. Ensure proper ventilation around the unit.
3

Access the evaporator fan (usually behind an interior panel). Check for obstructions and ensure the fan spins freely. If not, replace the evaporator fan motor.
4

Locate the thermistor (temperature sensor). Use a multimeter to check its resistance at room temperature (approximately 70 degrees Fahrenheit). Compare the reading to the manufacturer's specifications. A significant deviation indicates a faulty thermistor needing replacement.
5

Check the compressor relay. Use a multimeter to test for continuity. If the relay is open or shows high resistance, replace it.
6

If all other components check out, suspect a refrigerant leak. A qualified technician will need to locate and repair the leak, then recharge the system. Use appropriate recovery tools.
7

After repairs, plug the unit back in or turn the breaker back on and monitor the temperature. Verify proper cooling within the first 24 hours.

Safety Warning:

Disconnect power before performing any repairs. Lock Out / Tag Out (LOTO) procedures must be followed. Some components may carry 120V AC even when the unit is off. If you are uncomfortable working with electricity, contact a qualified technician.

Prevention:

Clean the condenser coils every six months. Avoid overloading the wine cellar, ensuring proper airflow. Check the door seal regularly for leaks. Ensure the unit is level.

Expert Tip:

Some Viking wine cellars have a service mode. To access it, simultaneously press and hold the up and down temperature buttons for 5 seconds. This will display diagnostic codes and allow for component testing. This may not be available on all models.

Frequently Asked Questions

•Where is the thermistor located in my Viking wine cellar?

The thermistor is typically located near the evaporator coil inside the wine cellar. It is often clipped to the fins of the evaporator or secured in a small housing. Consult your unit's service manual for the exact location.

•How do I check the door seal for leaks?

Close the door on a dollar bill. If you can easily pull the dollar bill out, the seal is not tight and needs to be replaced. Inspect the seal for cracks or damage.

•What type of refrigerant does my Viking wine cellar use?

The refrigerant type is usually indicated on a sticker located on the back of the unit near the compressor. Common refrigerants include R134a and R600a. This information is critical for recharging the system if there is a leak.

Viking Wine Cellar Not Cooling: Troubleshooting and Repair Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the thermistor located in my Viking wine cellar?

•How do I check the door seal for leaks?

•What type of refrigerant does my Viking wine cellar use?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: