Question about Refrigerators
Testing the Thermostat for Electrical Problems
Again using the wiring diagrams, determine which of the wires coming from the thermostat supply the power to the compressor motor's start relay switch. To check the thermostat, you will need to take a continuity reading through the thermostat's main contacts. To do this, set the function on your DMM to the R X 1 function, insert the test probes into the holes on the harness plug associated with those wires and rotate the knob on the thermostat through its full range. In the thermostat's "OFF" position, the meter's LCD should display an "O.L." and then, as you rotate the knob clockwise, the LCD should display a "0.000" if the thermostat is functioning properly, electrically. If you get a "0.000" reading even in the "OFF" position, the thermostats internal contacts are stuck in the closed position, and you need to replace the thermostat.
Defective Temperature Sensing Tube If the thermostatic control checks out electrically, the problem lies with its temperature sensing tube or bulb. This tube contains a gas which condenses as it get cold. As the gas volume decreases, the spring loaded contacts open, shutting the compressor off. There is no way to recharge the sensing tube once it has lost its charge, so you will have to replace the complete thermostat control.
Posted on Apr 03, 2015
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Posted on Jan 02, 2017
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