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- Bi-Metal Defrost Thermostat
Level of DifficultyReally easy
Time to do repair:15 - 30 mins
CustomerDennis from White Bear Lake MN
Fault in defrost circuit caused ice buid-up, decreased air flow, and elevated temp. Led to a thaw.
After observing defrost timer go into (and out of), defrost cycle, I checked continuity of heating element. Since heater coil was intact (79 Ohms of resistance), I figured the defrost thermostat (aka bi-metal therm.), had to be at fault. The new part ($17.00), proved my suspicions correct. As I sought to determine if everything worked, I had to wait for the temp. to drop below the defrost therm. set point before I would see the heater coil get hot.
To avoid the costly failure in future, I bought a Chaney wireless therometer with two remote sensors. Sensors require lithium batteries. $30.00 for both are a cheap insurance system.