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Thread: Is it the thermostat?

  1. #1

    Is it the thermostat?

    Model Number: TBX18SABQRWW
    Brand: GE
    Age: 6-10 years

    Hi! GE fridge is not cooling again. Defrosted entire unit because could not remove back panel of freezer to remove any ice build up behind it. Had trouble removing the freezer ice-serve snap-in grille that is holding the panel in. Unit worked for a while after defrosting but warming up again after about 1 1/2 mo. Should I check the thermostat now?

  2. #2
    Doc
    Join Date
    Mar 2016
    Posts
    709
    It the evaporator/freezer coil is iced over again then it sounds like a defrost problem.
    This causes the evaporator coil to be clogged with frost/ice and the evaporator fan cannot pull air through the coil to cool it properly.


    First remove the evaporator cover in the freezer so you can see the coils.
    If they are heavily iced/frosted over then it is a defrost problem.
    Do not let them de-ice.

    If yes.
    Manually force a defrost cycle by turning the defrost timer cam till the fans and compressor turn off.
    There is usually a hole in the cover to let you do this without taking anything apart.
    Now check the defrost heater to see if it is on.
    Be careful you do not want to burn your fingers.
    If the heater is on then the timer needs replacing, re: it is probably stalling during it's rotation so is never getting into a defrost cycle.

    If not on.
    Unplug the unit.
    Remove the wire for one side of the heating element from the wiring and measure it for continuity, usually around 20 ohms or so.

    If the heater is OK
    Remove one wire to the defrost thermostat (this is clipped onto the top of the evaporator coil) and measure it, should be 0 ohms when frozen. Note that it opens just above freezing so must be frozen to check it. Also inspect it, if it is bulged at all replace it even if it measures OK.

    If both the above are OK then odds are the defrost timer contacts are toast.

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