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I have a Thermador oven that will not hold the correct temperature when set. Is there a fix for this? I was told by a repairman that the thermostat needs replacing but that it has been discontinued. Has anyone else run across this problem and if so were they able to fix it? How? Thanks!
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Hello, The Thermostat was not available for a little while, but Thermador found another thermostat that can takes it's place. Unfortunately, Thermador states that self clean is no longer supported with this thermostat. Also, if you feel that the temperature just needs to be adjusted, you can try to calibrate your oven using the attached document KC
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Rank: Member
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Thanks for your help. Do you know what the new Thermador part number would be for this replacement thermostat?
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Rank: Advanced Member
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Sorry - I meant to include it. The part number is 622568.
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Thanks! Now, does anyone know where I can find instructions on how to remove and replace this part? Thank you!
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Originally Posted by: babalu3  Thanks! Now, does anyone know where I can find instructions on how to remove and replace this part? Thank you! New at this, but after finding the original part (486945) was obsolete (and it's replacement was $379+), I followed another persons idea of taking back off of the thermostat and cleaning the contact. I used a small piece of 320 grit sand paper. The heating was erratic before as well as a good 50 degrees high. I was glad to find the PDF on how to calibrate the thermostat here on this forum! Anyway, to get to the thermostat (on my Thermador PRDS304) I removed the grates and center piece from top of stove to access/remove (4) screws that hold the bracket that the t'stat is mounted to. Then from the front, I removed all the knobs then the front panel and removed panel. Careful to 'slide' (4) indicator lights off their little red lenses- mark these too (they break easily). I drew a picture with wire locations so I could put them back correctly. A metal piece slides off back of t'stat to access the interior where slide switch is. It was tricky to sand between the contacts, but it can be done. Hopefully my newly calibrated t'stat will continue (past my test period) to maintain temperatures without wide variances like before. Good luck
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Hi - So I am not an appliance repair person but I do have a background in fixing things that others break along with an electrical background. My Thermador PRDS364GL was doing a similar heat then cool trick. What I found through observation was it would heat to nearly any temperature just fine. Cooked pizzas at 500 even during this condition. Once the t-stat opened the heat circuit it would not reheat further. Eventually temp would drop to 250 or so even though the heat indicator light was illuminated. Studying the schematic I came to the conclusion that you really couldn't have both the heat indicator light on and no power to the bake element without something funny happening elsewhere past the t-stat. I pulled the t-stat to take a closer look and it was like new inside still. I then pulled the hot wire relay and there was significant carbonization on the bake element contact. I sanded both the bake and broil contacts nice and clean and then reinstalled. I have since ran the oven at 500 degrees and it maintained that for over an hour with regular cycling on and off. I would suggest this to anyone experiencing this problem. It is a fast fix without disassembling the entire top end.
Good luck!
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Rank: Member
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Originally Posted by: breaker Hi - I then pulled the hot wire relay and there was significant carbonization on the bake element contact. I sanded both the bake and broil contacts nice and clean and then reinstalled. ... It is a fast fix without disassembling the entire top end. Breaker, Can you describe where the "hot wire relay" is located as well as it's approximate size & description? My model 304 is built in, so I am hesitant to pull it out of the counter on each side to access the back, in case that is too involved. But I would like to check these/ this connection if easy to get to. My heating element bolts to the back wall of the oven (2 screws thru a flange). Since my 12/6/11 report of cleaning the contact inside the thermostat (which was pitted), the oven seems to stay at the set temperature within the normal +/- range. I think I recall the OEM acceptable temp range was +/- 25 degrees F. That seems pretty wide to me, but I am not an appliance tech, so maybe that is standard.
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Originally Posted by: davekro Breaker,
Can you describe where the "hot wire relay" is located as well as it's approximate size & description? My model 304 is built in, so I am hesitant to pull it out of the counter on each side to access the back, in case that is too involved. But I would like to check these/ this connection if easy to get to. My heating element bolts to the back wall of the oven (2 screws thru a flange).
Since my 12/6/11 report of cleaning the contact inside the thermostat (which was pitted), the oven seems to stay at the set temperature within the normal +/- range. I think I recall the OEM acceptable temp range was +/- 25 degrees F. That seems pretty wide to me, but I am not an appliance tech, so maybe that is standard. I have no idea where it is on your model. On mine, a dual fuel freestanding range, it is in the kickpanel.
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Rank: Member
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Breaker,
I see three relays in a line in the middle of the kick panel area. Can you think of a way to describe by orientation or wire color or size the "bake element contact" that needed cleaning on your model? Our models may be different, or not with regard to the relay layout.
I guess I could turn off the house breaker to that area and just start pulling and checking connectors one by one, but thought I'd ask first. :o)
Thanks
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