How to Replace WR50X10065 Defrost Thermostat on GE Refrigerator — Step-by-Step

Your GE refrigerator's freezer looks like an ice cave, and the fresh food section isn't staying cold anymore. That's the classic signature of a failed defrost thermostat — the WR50X10065 is one of the most common culprits in side-by-side models like the GSL25JFTABS and PSE25KSHEHSS. When this little thermal switch fails, your defrost heater never kicks on, frost keeps building, and eventually airflow gets blocked between compartments.

What You Need Before Starting

• 1/4-inch nut driver or socket wrench
• Phillips screwdriver
• Flathead screwdriver for panel clips
• Work gloves (evaporator area gets cold)
• Towels (for melted ice)
• Hair dryer or heat gun (optional, for defrosting)

Estimated Time: 45-60 minutes (plus 2-3 hours if you need to defrost first)

Difficulty: Moderate — you'll be removing the freezer's interior panel

Safety First

Unplug the refrigerator completely before starting this repair. You'll be working behind the freezer's back panel where sharp evaporator coils and the defrost heater live. If your freezer has significant frost buildup, you'll need to defrost it first — either let it sit unplugged overnight with towels underneath, or carefully use a hair dryer on low setting. Never chip ice with tools near the evaporator coils; one puncture means a sealed system leak and a very expensive repair.

Step 1: Empty the Freezer and Remove Shelves

Take everything out of the freezer compartment. Remove all shelves, bins, and the ice maker bucket if your model has one. You need clear access to the back wall panel. On models like the GSS25JETBWW and GSHF5PGXAEWW, there are usually two or three wire shelves that just lift up and out once you angle them properly.

Step 2: Remove the Freezer Back Panel

The white plastic panel covering the evaporator coils is held by 6-8 screws around the perimeter. Use your 1/4-inch nut driver to remove all visible screws. Some are hiding under small plastic caps — pop those off with a flathead screwdriver first. Once screws are out, the panel should pull forward, but it might be frozen in place. If it won't budge, your evaporator is iced over and you'll need to defrost before continuing. Don't force it or you'll crack the plastic mounting tabs.

Step 3: Locate and Test the Defrost Thermostat

The WR50X10065 is a small aluminum-bodied thermostat clipped to the evaporator coils, usually on the left side. It has two wire terminals and a sensing bulb pressed against the coil surface. Before removing it, you can test it with a multimeter set to ohms — at room temperature, it should show continuity (close to 0 ohms). If it reads infinite resistance, it's definitely bad. If you see continuity, put it in your freezer for 10 minutes and test again; it should still show continuity until it hits about -5°F, then open the circuit.

Step 4: Install the New WR50X10065 Thermostat

Pull the wire connectors off the old thermostat terminals — they're just push-on spade connectors, no tools needed. Unclip or unscrew the mounting bracket holding the old thermostat to the evaporator coil. Position the new WR50X10065 in exactly the same spot with the sensing bulb making solid contact with the coil surface. This contact is critical; if it's not touching metal, the thermostat won't sense the actual coil temperature. Reconnect the two wires to the new terminals — they're not polarity-sensitive, so either wire can go to either terminal.

Step 5: Reassemble and Test the System

Reinstall the freezer back panel with all screws. Make sure the panel sits flush — any gaps will let cold air escape into the fresh food section. Put shelves back in, plug the refrigerator back in, and let it run for 24 hours. You should hear the compressor cycle normally, and frost should not reaccumulate on the evaporator coils. Check both compartments with a thermometer: freezer should hit 0°F, fresh food around 37°F. If temperatures are right and there's no frost buildup after a few days, your repair was successful.

Testing After Installation

After 6-8 hours of runtime, open the freezer and feel the back panel. It should be cold but not encased in ice. Listen for the defrost cycle — every 8-12 hours, you'll hear a brief hissing sound as the defrost heater melts any accumulated frost. If you're still getting frost buildup after 48 hours, double-check that the thermostat's sensing bulb is actually contacting the evaporator coil. A thermostat that's not touching metal can't do its job.

Frequently Asked Questions

Will this WR50X10065 work on my Hotpoint or Kenmore refrigerator?

Yes, if your model number is listed in the compatibility data. This thermostat is used across GE, Hotpoint, RCA, and some Kenmore models that were manufactured by GE. It replaces part numbers AP3796816, PS966762, and EA966762. Always verify your model number against the compatibility list before ordering.

How do I know if it's the thermostat or the defrost heater that's bad?

If your evaporator coils are completely covered in thick frost, something in the defrost system failed. The thermostat is more common than the heater, and it's cheaper to replace. Test the heater with a multimeter — you should see 50-100 ohms of resistance. If the heater tests good but you still have frost, it's almost certainly the thermostat. The defrost timer can also fail, but that usually causes both fresh food and freezer sections to stop cooling completely.

Do I really need to defrost the freezer before replacing the thermostat?

If there's heavy frost buildup, yes. You can't remove the back panel safely when it's frozen in place, and you won't be able to properly position the new thermostat's sensing bulb against ice-covered coils. The good news is that once you've defrosted and installed the new WR50X10065, that frost shouldn't come back. If it does, you've got another problem in the defrost system.