This defrost thermostat monitors evaporator temperature and controls power to the defrost heater, helping prevent frost buildup and overheating. Replacing a failed thermostat restores proper automatic defrosting and more consistent refrigerator temperatures. What it does:
- Monitors evaporator-coil temperature to control the defrost heater circuit
- Terminates the defrost cycle when the coil warms to a safe temperature
- Failure can cause heavy frost behind the freezer panel and poor cooling
- May lead to longer-than-normal run times or a heater that won't energize
What's included:
Install notes:
- Disconnect power before servicing; access is typically behind the freezer's rear panel
- Note wiring; transfer any existing mounting clip and clamp firmly to the same evaporator tube location
- Avoid damaging fins or refrigerant tubing; route wires clear of the fan and heater
- Thermostat must be cold to read closed continuity during testing
Also known as: defrost limit, defrost terminator, bi-metal thermostat.
Do-It-Yourself Stories from Customers like You
Freezer was very cold but the fridge wasn't David P. • Rising Sun , MD • July 11, 2015
Replaced the thermostat. Watched the video and it made it easy.
Read more