Frigidaire Defrost Thermostat Replacement Guide

What the 5303918214 does

The defrost thermostat monitors the evaporator coil temperature. It signals the defrost heater to activate when the coil is too cold and deactivates it once the ice melts, preventing excessive frost buildup.

Symptoms when this part fails

• Excessive frost buildup on evaporator coils
• Refrigerator or freezer not cooling properly
• Food spoilage due to inconsistent temperatures
• Defrost heater not activating or running too long
• Water pooling inside or outside the refrigerator

Compatibility

Fits the Frigidaire family. Specifically:

• Any unit originally equipped with OEM part number(s): 5303917954, AP4374171, 216872200, 1483781, 216731000, 218673001, 218673008.
• Check the model/rating plate inside your appliance and compare it against the fitment table on the product listing before ordering — this guide does not list specific compatible models because Amazon does not provide verified fitment data through this pipeline.

Also replaces: 5303917954, AP4374171, 216872200, 1483781, 216731000, 218673001, 218673008

Tools you'll need

• Phillips screwdriver
• Nut driver set
• Wire strippers/cutters
• Multimeter

Difficulty: Moderate · Time: 45-90 minutes

How to install the 5303918214, step by step

1. Unplug the refrigerator from the power outlet.
2. Remove freezer shelves and the back panel to access the evaporator coil.
3. Locate the defrost thermostat clipped to the evaporator coil tubing.
4. Disconnect the wires leading to the old thermostat.
5. Remove the old thermostat and clip the new one onto the tubing.
6. Connect the wires to the new thermostat.
7. Reassemble the freezer panel and shelves.
8. Plug the refrigerator back in and test its operation.

Related troubleshooting

If swapping this part doesn't fix the issue, check these next:

• How to change a refrigerator water filter: Whirlpool, Samsung, LG, GE, Frigidaire
• What is Refrigerator Defrost Mode and How it Works