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something keeps throwing my thermostat heater?

I have a kenmore frostless freezer model number FFFH20F2QWC and it worked well for months after I got it (used from a "repair" shop) past the "warranty" date they gave, then it quit. everything I read pointed to the thermostat heater so we checked it (i think i did it right ) and it had no power so we replaced it. about a week to wk and a half later it stopped cooling again and the temp light was blinking and beeping again. I really like this freezer but can't keep replacing the heater or leaving it unplugged for a while as to reset it every time it does this. Any suggestions?

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Hi @kaseopaya

Bit confused by your terminology, do you mean that the defrost heater is always going faulty or that the defrost thermostat which is part of the heater is faulty.

If the compressor not operating when the temp light is blinking it sounds more like a problem with the defrost timer than the heater

Here's the wiring diagram for the freezer that may help.

As can be seen by the notes, the defrost timer, (shown as timer in the wiring diagram) disconnects the compressor circuit after every 12 hours compressor run time and switches over to supply power for 30 minutes to the evaporator defrost circuit comprising the evaporator defrost heater and the defrost thermostat.

If the temperature detected by the defrost thermostat goes >50°F before the 30 minutes has elapsed, it opens to cut off power to the heater so as to not damage the evaporator unit. Once the 30 minute defrost time has elapsed, the timer switches the circuit back to turn on the compressor to drive the temperature back down to the set operating temperature as selected by the temperature thermostat (shown as the cold control in the wiring diagram).

If the temperature detected by the defrost thermostat stays <50°F, once the 30 minute defrost time has elapsed, the timer cuts off the heater circuit and switches the circuit back to turn on the compressor circuit, to drive the temperature back down to the set operating temperature as selected by the temperature thermostat (shown as the cold control in the wiring diagram).

When the temperature reaches <10°F the defrost thermostat closes which prepares the defrost heater circuit for the next defrost cycle.

The compressor operating/not operating during the period between the defrost cycles is controlled by the temperature thermostat i.e. when the freezer's set temp of 2°F is reached, the temperature thermostat opens to turn off the compressor as you don't want it to get any colder. When the freezer temperature rises above the set upper limit of the temperature thermostat of 8°F it closes to turn on the compressor to drive the temperature back down to the set operating temperature. The compressor cycles on and off keeping the temperature between 2°F - 8°F as controlled by the temperature thermostat, until the next defrost cycle when it is turned off for 30 minutes, by the defrost timer.

Apologies for the long answer but I thought that if you understood how it's supposed to operate, you can work out why it isn't.

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It wouldn't let me post a picture so here's the link to one that looks like what I replaced.

https://www.grainger.com/product/49X213?...

Not gonna lie, the diagram is confusing. (as well as the 1st part of the run down, give me an algebra problem over this any day.) My freezer was frosting at the bottom, where the cover for the electronics is and would stop cooling. After leaving it off for a bit it would work again, but after a bit do the same thing. So I tried to look up what it may be and it said to replace the heater first that it causes that, so I did. I tried to check it first and got nothing so I felt pretty safe in assuming that's what it was. I put it in and waited about a week or so before putting all of my food back in and right at a week it started again with the beeping and not cooling.

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@kaseopaya

The part that you linked is a thermostat, so did you replace both the heater element and the thermostat?

If you did then you need to check that power is getting to the heater/thermostat during the defrost cycle.

The defrost timer gets power through the temperature thermostat and the motor in the timer only operates when the temperature thermostat detects that the temp is too warm and operates basically to turn on the compressor through the timer switch. Once the set temp is reached the temp thermostat releases and this not only stops the compressor it also stops the timer

After the timer motor has run for a cumulative 12 hours it operates a switch to change the circuit from the compressor to the heater

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@jayeff no, I thought that was the heater. I will try and check the heater and replace it. that's the long one that the thermostat connects to right? That's what I thought initially, but a video only showed the part I linked. Thank You!!!

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@kaseopaya

FYI here's a link to a supplier that shows all the parts for the model.

It is useful because you can use it to find the manufacturer's part number for any part.

Your model is actually a Frigidaire freezer either made for or rebadged by Kenmore.

The heater part number is 5304496284 (suppler example only).

As can be seen in the image of the part, the thermostat and the heater come as one module.

Search online using the part number only to find suppliers that suit you best

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