Checking a defrost thermostat is a crucial step in maintaining the proper functioning of refrigeration systems. A defrost thermostat is a device that controls the defrost cycle of a refrigerator or freezer. When the temperature in the evaporator coil rises above a certain level, the defrost thermostat will activate the defrost heater, which will melt any ice that has formed on the coil. This process ensures that the evaporator coil remains clear of ice, allowing the refrigerator or freezer to operate efficiently.
There are a few different ways to check a defrost thermostat. One way is to use a multimeter to measure the resistance across the thermostat’s terminals. If the resistance is zero, then the thermostat is closed and is functioning properly. If the resistance is infinite, then the thermostat is open and needs to be replaced.