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 Whirlpool Refrigerator Defrost Thermostat Replacement Guide?

The most frequently replaced parts for Whirlpool 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 Whirlpool 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.

Whirlpool Refrigerator Defrost Thermostat Replacement Guide

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

Frost buildup on the evaporator, freezer not cooling, or long freeze cycles mean your defrost thermostat may have failed. Replacing it restores proper defrost timing.

Q: How do I fix Whirlpool 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.

Whirlpool Refrigerator Defrost Thermostat Replacement Guide — What This Part Does

The defrost thermostat is a temperature-operated switch clipped to the evaporator coil. When the coil is cold enough during a defrost cycle, the thermostat closes to allow current to the defrost heater. As the coil warms up, the thermostat opens to stop the heater and end the defrost. This prevents frost from building up on the evaporator.

The part fails when the bi-metal contacts stick open or closed. If it stays open when cold, the heater circuit never completes and frost piles up. If it fails closed, the heater may run too long or the control board misreads the circuit. Heavy ice on the evaporator is the most common result.

Jump to Replacement Steps

Signs It Needs Replacing

Heavy frost or ice buildup on the evaporator coil The defrost heater isn’t running because the thermostat is stuck open and won’t complete the circuit.
Freezer stops cooling or temperature rises Ice blocking the evaporator airflow causes warm spots and poor refrigeration.
Defrost cycles run too long or not at all A failed-closed thermostat may let the heater overrun, or a failed-open stat prevents any defrost from starting.
Freezer fan sounds labored or stops Ice buildup around the fan blades restricts rotation when defrost isn’t clearing the coil.
Water pooling under crisper drawers or on floor Excess meltwater from prolonged heater operation or blocked drains shows up as leaks.
No continuity through thermostat at 20°F Testing the part in a cold ice bath shows it stays open instead of closing, confirming the failure.

How to Replace It

Unplug the refrigerator and move it away from the wall if needed for access.
Empty the freezer and remove all shelves, bins, and the light lens cover if present.
Unscrew and remove the rear evaporator cover panel to expose the evaporator coil and defrost components.
Locate the defrost thermostat clipped to one of the evaporator tubes, usually near the top or side of the coil.
Test the old thermostat with a multimeter: at room temperature (around 40°F) it should show no continuity, and in an ice-salt bath (around 20°F or colder) it should close and read 0 to 1 ohm.
Disconnect the wire harness from the thermostat and unclip or unscrew it from the evaporator tubing.
Clip the new defrost thermostat onto the same evaporator tube in the same orientation and reconnect the wire harness.
Secure any loose wiring with existing clips or ties, then reinstall the rear evaporator cover panel and all screws.
Replace freezer shelves and bins, plug the refrigerator back in, and monitor for normal defrost cycles and no new frost buildup over the next 24 to 48 hours.

The Part You Need

Part	Notes
Whirlpool defrost thermostat (bi-metal / termination thermostat)	Amazon \| Check the model and serial plate inside the fresh-food or freezer compartment for your exact refrigerator model number, then cross-reference the defrost thermostat part number in Whirlpool’s online parts catalog or with your parts supplier.

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

When to Call a Pro

If the new thermostat tests good (closes at 20°F, opens at 40°F) but frost still builds up, the defrost heater or defrost control board is likely the real problem. Diagnosing control-board logic or timer faults requires a wiring diagram and sometimes a scan tool. Call a technician when you’ve replaced the thermostat and heater but defrost failures continue, or if you’re not comfortable working around live evaporator components and refrigerant tubing.