Can I keep running the equipment with this fault active?

Generally no. Faults on Appliance units are emitted when a sensor, safety, or control circuit is outside its operating envelope. Running through an active fault risks compressor, heater, or control-board damage. Diagnose and clear the fault first.

What part is most commonly replaced for Frigidaire Refrigerator Defrost Thermostat Replacement Guide?

The most frequently replaced parts for Frigidaire Refrigerator Defrost Thermostat Replacement Guide are listed in the Parts Reference section of this guide with OEM part numbers and typical price ranges. Check the table for direct replacements.

Is Frigidaire Refrigerator Defrost Thermostat Replacement Guide a DIY repair or do I need a technician?

Sensor swaps, fan motor replacements, and condenser cleaning are typical DIY-level repairs. Anything involving refrigerant, gas, or high-voltage (>240V) work requires a licensed technician for both safety and code-compliance reasons.

Frigidaire Refrigerator Defrost Thermostat Replacement Guide

Q: What does Frigidaire Refrigerator Defrost Thermostat Replacement Guide mean?

Ice buildup on evaporator, poor cooling, and freezer frost point to a failed defrost thermostat. Replacing the bi-metal switch restores defrost cycles.

Q: How do I fix Frigidaire Refrigerator Defrost Thermostat Replacement Guide?

Follow the step-by-step diagnosis below. The most likely fix is identified by checking power, sensor resistance, and control-board signals in order — using a multimeter and the part numbers documented in the parts reference table.

Frigidaire Refrigerator Defrost Thermostat Replacement Guide — What This Part Does

The defrost thermostat, also called a bi-metal or termination thermostat, is a safety switch clipped to the evaporator coil tubing. When the coil is cold (around 25°F on many Frigidaire units), the switch closes and allows the defrost heater circuit to complete. Once the coil warms during defrost, the thermostat opens to cut power to the heater and prevent overheating. This automatic on-off cycle keeps ice from building up on the evaporator.

The bi-metal switch inside the thermostat can fail open, meaning it won’t close even when cold. When that happens, the defrost heater never runs, ice accumulates on the evaporator coil, and airflow drops. You’ll see frost on the rear freezer panel and reduced cooling. Sometimes a bad connector or wiring harness can mimic a thermostat failure, so always test for continuity before ordering a new part.

Jump to Replacement Steps

Signs It Needs Replacing

Thick frost or ice on the rear freezer panel Ice buildup on the evaporator cover inside the freezer means the defrost cycle is not completing.
Refrigerator not cooling properly Blocked airflow from ice-covered coils reduces cooling performance in both compartments.
Freezer temperature rising The evaporator can’t transfer heat when it’s insulated by ice, so the freezer gets warmer.
Defrost thermostat shows no continuity when cold Testing the thermostat with a multimeter at 25°F or below should show a closed circuit, not open or OL.
Constant compressor run without defrost The compressor runs longer and longer because the iced-up coil can’t reject heat efficiently.
Frost inside fresh-food compartment When the evaporator freezes solid, warm humid air can reach the fridge side and condense as frost.

How to Replace It

Unplug the refrigerator or switch off the circuit breaker to kill all power.
Remove all freezer shelves, bins, and mounting rails so you can access the rear evaporator panel.
Unscrew and lift off the evaporator cover panel to expose the evaporator coil and defrost components.
Locate the defrost thermostat clipped to one of the evaporator tubes or coil lines.
Disconnect the wire connector or individual spade terminals from the thermostat, then test for continuity with a multimeter if the part is cold (around 25°F), an open reading means the thermostat is bad.
Unclip or slide the old thermostat off the evaporator tubing.
Clip the new defrost thermostat onto the same tube in the same position so it reads coil temperature accurately.
Reconnect the wire harness or spade terminals to the new thermostat.
Reinstall the evaporator cover panel and all freezer shelves, then restore power and monitor for proper defrost cycling over the next 24 hours.

The Part You Need

Part	Notes
Frigidaire defrost thermostat (bi-metal termination thermostat)	Amazon \| Common part numbers include 5304521781, 808062701, and 4931265. Check the model and serial plate inside the refrigerator door or on the rear wall for your exact model number, then cross-reference on the Frigidaire parts site or an aftermarket supplier to confirm fitment.

If this part is failing you may also see one of these codes:

When to Call a Pro

If you test the defrost thermostat cold and it shows continuity, the problem is elsewhere in the defrost system. The defrost heater, timer, control board, or evaporator thermistor can all cause the same ice-buildup symptoms. A technician can run a forced-defrost cycle from the control or timer to pinpoint which component has failed. Also call a pro if you’re not comfortable working behind live evaporator coils or if your Frigidaire uses a sealed wiring harness that requires soldering or crimping new connectors.