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Customer Questions and Answers for Thermostat by Whirlpool

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    • Part Number: AP4078076
    • MFG Part Number: 67003426
    • Made by: Whirlpool
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Questions & Answers

For Whirlpool Thermostat (Part Number: AP4078076)

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Month or two ago, fridge got warm - lost contents. Noticed freezer was extra cool & vents at rear were frosted / iced over. Used heat gun to melt ice at back of freezer - appears fridge & freezer then operated normally. Fridge again became warm - some minor freezer ice was noted in vent area at lower back area of freezer. Pulled back cover - evaporator coils were frosted / iced over. Used heat gun to melt ice & defrost freezer area. Suspect defrost thermostat - any test or opinion on my problem?

Dave C for Model Number Ammana afd2535deb

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The other day I opened the fridge and noticed it was extremely warm (60deg). I checked the damper and it was open, however there was no airflow. I then checked the freezer, saw no frost build up and noticed that the condenser fan was not spinning, however it was humming. If I flick the fan it will spin for 2-5 secs then stop. I figured the fan motor was bad so I replaced it, nothing changed. Still the same response except now maybe the fan will run 1-2 minutes steady, although noisy, and then come to a stop and hum. I checked the old motor for continuity and it showed 0. The new fan is showing 95-100. My next step was to chat with some of your technicians, they suggested replacing either the thermistor or the thermostat. I bought both components but only replaced the thermostat. The fan seems to run for 2-3 minutes but continues to seize up. Help! What do I do next????

Chad for Model Number Amana AFB2534DES

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Hi all. Ok, my refrigerator (freddie) has gone warm, while my freezer is fine. I've looked on the forum and read most of the questions/answers here. It appears this is a defroster thing-- according to the discussions. I just talked with Gene-- on the forum (the owner of an appliance shop in the OC, in So. Cal). He said that my model does not have a defrost timer, but all that is controlled by a circuit board. At this point, I'd like to know how I find out why my freddie is not working, while the freezer is. I've looked at the diagram for the part, and it appears to somewhere inside the back panel of the freddie, but I have no idea where. I've just replaced my dryer, so I'm really hoping to not have to do so with the freddie. Please.... help! TYIA. SteveB

Steve B for Model Number kenmore 596.75504400

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Kenmore mod#596.75509400. The bottom freezer works but the upper refrig.doesn't. The fan at the back of the freezer compartment is working, but no air coming from the damper unit in the refrig. Can you help me?

Suzanne for Model Number 596.75509400

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My freezer is frosting up on the back wall. The coils are totally iced over. I triggered a long defrost by holding the door light and pushing temp down 3 times. It kicked in and indeed defrosted the coils (fast!). What does this tell me? Thermostat bad? Other? We've sunk over $800 in repairs into this thing so I'm either going to tackle this myself or buy a new fridge. Thanks in advance!

Keith for Model Number GB2SHTXTB00

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Ice buildup on the freezer coil. Ran the diagnostic and it comes up with a 1S (defrost thermostat shorted) After reading other folks questions, it seems there is no defrost thermostat. I changed the plug in heater module and that didn't fix the problem. (Checked the old one and it tested ok at 30ohms). Does the thermistor have anything to do with that? I did put the control board into a "forced defrost cycle" and that didn't seem to get rid of the ice but I fear the buildup was just too great.

Dadio for Model Number maytag mbf 2255 KEW

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My freezer works fine but the refigerator compartment warms about every month and I have to dis-assemble and defrost. I have checked the heater element and it reads approximately 30 ohms. I have been told that the defrost thermostat may be bad and that it is the part that clips onto the evaporator coil. I cannot find the part on your drawings. Will part number AP4078076 work as a replacemnt or could the termistor be a problem. I would like to try these least costly things before replacing a circuit board.

Doug for Model Number Amana AFF2534FEW3

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Where is this thermostat? I can't find it in your drawings. The best this refrigerator can do is about -3 and it will not make ice very fast. It takes like 2 days to get one dump into the tray. We replaced the fan in the freezer compartment. The upper part is cold but freezing the water spout thing in the freezer. I have to use a hair dryer to get water going again. The temperature in the fresh food compartment is 39°. I have a spare themistor. Should I try and replace it in the bottom or replace the fan in the back? I hope you can help. I don't want to buy lots of parts if I don't have to. Thanks!

Frank W. for Model Number mfd 2561hes

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The freezer is frosting up and when it does, the refrigerator stops cooling. This was happening every couple of months, now it happens about a week after letting it thaw. Is there a way to check whether or not it is the defrost thermostat before ordering the part? Would like to replace only what is needed. Thank you.

Beth for Model Number ABB2222FEB

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Freezer is defrosting it makes a buzz sound for a few seconds then stops. Could it be the thermostat?

Al for Model Number abb1921dew

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