Viking Freezer Not Freezing: Troubleshooting Guide -... | appliancefaults.com

Technical Background:

The Main Control Unit (MCU) relies on thermistor readings to regulate compressor operation and maintain the set temperature. Voltage signals from the thermistor are interpreted by the MCU, which then modulates power to the compressor and fans via relay circuits. A failure in any component can disrupt the cooling cycle.

Symptoms:

The homeowner reports the Viking freezer is not reaching 0 degrees Fahrenheit, leading to food spoilage. The internal temperature is significantly warmer than the setpoint. An ice cream test reveals soft ice cream.

Possible Causes:

Dirty Condenser Coils
Faulty Start Relay/Overload
Defective Compressor
Door Seal Leak
Inefficient Evaporator Fan Motor
Thermistor Malfunction

Solution:

1

Unplug the freezer or turn off the breaker to the unit.
2

Inspect the condenser coils at the back or bottom of the unit. Clean thoroughly with a coil brush and vacuum.
3

Using a multimeter, check the start relay/overload for continuity. Replace if defective.
4

Test the compressor windings for continuity and shorts to ground. A faulty compressor requires licensed technician replacement.
5

Check the door seal for air leaks. Replace if torn or damaged.
6

Verify the evaporator fan motor is running smoothly. If not, replace the fan motor.
7

Use a multimeter to test the thermistor resistance. Replace if the resistance is out of the specified range for the given temperature.

Safety Warning:

Disconnect power before performing any repairs. Lock Out/Tag Out (LOTO) procedures must be followed. Some components operate at 120V AC. Handle with care.

Prevention:

Clean the condenser coils every 6 months to ensure proper heat exchange. Inspect the door seal regularly for damage. Avoid overpacking the freezer to ensure proper air circulation.

Expert Tip:

Viking freezers often have a service mode. Holding the 'Up' and 'Down' temperature adjustment buttons simultaneously for 5 seconds may access diagnostic codes and advanced settings.

Frequently Asked Questions

•What is the correct thermistor resistance at 32 degrees Fahrenheit?

Refer to the Viking service manual for the specific model. Typically, thermistor resistance ranges from 5k to 10k ohms at 32 degrees Fahrenheit.

•How do I properly test the compressor windings?

Using a multimeter set to ohms, test each winding for continuity. Then, test each winding to the compressor body for shorts to ground. High resistance or a short to ground indicates a faulty compressor.

•Where can I purchase replacement parts for my Viking freezer?

Authorized Viking appliance parts distributors or reputable online appliance parts retailers are the best sources for genuine replacement parts.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct thermistor resistance at 32 degrees Fahrenheit?

•How do I properly test the compressor windings?

•Where can I purchase replacement parts for my Viking freezer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: