How To Test the Thermostat
Caution:
Please read our safety information before attempting any testing or repairs.
Before testing the thermostat, unplug the refrigerator to avoid an electrical shock hazard.
There are two types of ice makers: modular and component models. Both allow you to test and replace the thermostat individually.
Determine the Type of Ice Maker:
- Remove the Outer Face Plate:
- If there is a knob, pull it off first.
- Pry off the face plate with a small screwdriver.
- Identify the Model:
- Modular Unit: The module’s face plate will have several holes, each marked with a letter. These holes are for test probes.
- Component Unit: Usually has exposed gears and no testing holes.
Modular Ice Maker:
For modular instructions, follow the steps specific to your model’s manual or refer to the manufacturer’s guidelines.
Component Ice Maker:
- Remove the Ice Maker:
- It is easier to work on this type of unit by first removing the entire ice maker from the freezer compartment.
- The unit is usually mounted to the freezer case by two or more screws.
- Remove the bottom screws first. While supporting the ice maker, remove the remaining top screws.
- Unplug the ice maker from the freezer cabinet if you have not already done so.
- Remove the Inner Mounting Plate:
- The inner mounting plate is held in place by two or more screws.
- Near the edge where the shutoff arm is located, a pin (labeled “A” below) protrudes through the plate.
- This pin has a spring under the mounting plate. Reduce the tension on the spring by moving the shutoff arm down and next to the ice maker.
- Remove the mounting plate.
- Test the Thermostat:
- Use a multitester set to the ohms setting X1.
- Locate the thermostat within the ice maker assembly.
- The thermostat is connected by two wires. The wires are connected with slip-on connectors. Firmly pull the connectors off of the terminals (do not pull on the wire). You may need to use a pair of needle-nose pliers to remove the connectors.
- Inspect the connectors and the terminals for corrosion. If the connectors are corroded, they should be replaced.
- Place a probe on each terminal of the thermostat. The multitester should display a reading of zero when the thermostat is cold and a reading of infinity when it is warm (40 to 90 degrees F, depending on the model).
- Evaluate the Results:
- If the thermostat does not pass this test, it should be replaced.
- If the thermostat passes the test, reassemble the ice maker, ensuring all connections are secure and properly aligned.
By following these steps, you can accurately test the thermostat in your component ice maker to ensure it is functioning correctly. If the thermostat is faulty, it will need to be replaced to restore proper ice maker operation.
