Refrigerator Defrost Thermostat Test




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Fred Allen: Yesterday I was in a bad mood when my new defrost thermostat (L55 - 35F) tested the same as my original one. It measured 56,000 ohms at room temperature AND after 10-20 minutes of ice water. Hitting the internet i found ablog that made total sense. My model of defrost thermostat has a high resistance rather than open to allow a low level of heat on the heater for the rest of the defrost cycle to prevent water drops freezing on the way to the drain trough. After I defrosted the freezer totally which allowed air passage through the previously frost filled coils thus freezing could then function again I placed BOTH new and old thermostat into the freezer for an hour. Presto bad mood gone......the original one still measured 56 k ohms (56,000 ohms) and the new one measured 0 ohms. Today the freezer will have the new one installed with issue fixed. I know it will be fixed because the defrost timer was replaced last month and the heater measures 30 ohms. Plus i had placed a wire jumper in place of the defrost thermostat then forced a defrost by slowly turning the defrost timer manual dial till the freezer fan stopped...once the ice cube placed against the heater started to melt fast,,,fix should be A OK once defrost thermostat is changed.

RepairClinic.com: It's likely there is either a restriction or, as you said, a leak in the sealed system. Unfortunately repairs to this system must be performed by a licensed technician. Sorry to give you bad news!

RepairClinic.com: Thanks for the comment! Please refer to our help section on our website for further technical advice. There is a link towards the bottom of this video's description.

ZombiedustXXX: Nice, but what are symptoms of a possible failed defrost thermostat? Is this a gradual condition over time, or does failure of this component happen suddenly?

mustselect: This video states "if your thermostat has a closing temp of 30 degrees or above, you can easily test it for continuity" but then in the test, you state that the thermostat should have continuity (be closed) in ice water. Problem -- the temp of ice water is too close to 30 degrees to be able to reverse engineer from your video the one bit of useful information that you could provide but don't provide: what are the specs of the damn device.

RepairClinic.com: This video applies to a number of different defrost thermostats so we can't provide specific specs. The specs of the thermostat should be on the thermostat itself. We also list the specs of the thermostat on the specific part pages on our website when we can.

RepairClinic.com: I apologize, you are correct! When the thermostat is warm the reading should be infinity. If it produces a reading of zero when warm, this is an indication of a bad thermostat.

jgstargazer: I had a defrost problem in my refrigerator, the condenser was packed with ice. Your videos were helpful in testing all parts responsible. Found the defrost thermostat bad and now the frige works fine, thanks!

filipinofighter1: @RepairClinic I thought when your thermostat is cold, it should produce a reading of zero ohms on multitester. If it is warm ( anywhere from forty to ninety degrees fahrenheit ), then the test reading should produce a reading of infinity. If i'm not mistaken it is the same principle of testing the thermistor. My question is why my thermostat has zero ohms reading even though it is warm. I think i should get zero ohms reading if i immerse to ice cold water in 5-10 minutes. I think it is shorted

RepairClinic.com: I would recommend using the repair help section of our website. If you enter your model number there you'll have access to model, part, and symptom specific repair help.

RepairClinic.com: You're welcome.

TheSpiffer1: My thermostat failed to conduct even when placed in ice water, so it seems to be bad. But when I inspected the evaporator coils, they were not all iced up; instead only the first 6 or 8 inches were icy. Is it worth replacing the thermostat, or is there a more serious problem, like a leak in the sealed system?

RepairClinic.com: @ZombiedustXXX The most common symptom is the cooling is poor in the refrigerator. But it could either be the cause of the defrost thermostat, defrost timer, or the defrost heater. The parts would have to be tested to determine which is at fault.

filipinofighter1: @RepairClinic I also found out that when i shake the thermostat it rattle, it seems that something was gone bad inside the thermostat but I'm not sure if thermostat that i tested last night was really shorted. Kindly help solve my diagnosis of my GE refrigerator model DSS25KSRE. Your reply would be appreciate!

RepairClinic.com: Correct. That is why you put it in ice water.

RepairClinic.com: That's great! I'm glad you were able to figure out what was wrong. Enjoy your working refrigerator!

Jason Vorhees: Shouldn't it only have continuity when it is cold enough for the switch to be closed?

RepairClinic.com: If your thermostat gets a reading of 0 ohms of resistance, the thermostat has continuity.

Andy Hopper: Mine shows NC at room temp.. I restarted the fridge without it.. so cct is open now.. problem I have def cycle not working.. I tested heater cct.. its closed cct.. even bought new controller, nope.. service manual doesn't tell how circuit makes its decision when to run.. I'm guessing its still a timer.. Samsung RS2630

Richard Riley: Maytag # MSD2660KGB The freezer and refrigerator is working but not cooling. And it have a digital timer and each time i set it will not stay to its original settings. Do you think the problem is in the timer?
Rating:
Refrigerator Defrost Thermostat Test 4.8 out of 5

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Refrigerator Defrost Thermostat Test