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Originally Posted by: davekro  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 The hot wire relay looks like this. The high current contacts are at one end of the unit. You can remove the plastic cover to gain good access to them once the relay is removed from the appliance chassis. I hope that helps.
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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 am also looking for the hot wire relay. Did you locate it on your model 304 and if so where? I am having issues like what breaker is mentioning. Were you any of your measures taken to fix hot wire relay successful?
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Originally Posted by: Servicer Do you know where the Hot Wire Relay is located on my model Thermador PRD304? I have the diagrams but between the exploding diagrams and the matching parts list. None of the descriptions are similiar.
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The model number given (PRD304) does not use a hot wire relay, but the units that did (GCR304, PRSE304 and PRDS304), had the HWR located on the bottom, behind the kick panel. Before working on it, make sure to turn the circuit breaker off.
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Originally Posted by: Servicer The model number given (PRD304) does not use a hot wire relay, but the units that did (GCR304, PRSE304 and PRDS304), had the HWR located on the bottom, behind the kick panel. Before working on it, make sure to turn the circuit breaker off. Perhaps you have some other suggestion. I have fluctuating oven temperature. It seems as though the oven tries to reach set temp and then eventually 20-30 minutes reverts back to approximately 250 degrees, regardless of whether you have the oven set to 500 degrees or 350 degrees. We have done the follow. Replaced the oven thermostate sensor. Oven still not reaching temp. Upper Element will glow red hot for broiling so it is functioning. The lower element we disassembled and checked for continuity and it was fine. Did the 1 minute heat and felt the element with hand and it is warming. So it appears both elements are working and new thermostat sensor. Any suggestion on where to go next to isolate or eliminate issue? If the next item to look at is the control board. What measurement would I use to isolate or elimate if it needs to be replaced. Ohm reading? Or?
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If the heat light is on while it's not heating, it's most likely the hot wire relay. The only other components in the circuit are the elements and selector switch, which are unlikely to work intermittently.
One test you can do (while the breaker is turned off) is switch the wire from the H1 terminal, which is specific to bake, to the H2 terminal, which is specific to broil. If it is the H1 side of the HWR that's bad, the bake element should continue to heat and the broiler should start to drop out. Though the baking may heat better, it won't be perfect, because the broil element is also used during bake, but only at 50%, and it will now start to drop out. Also, if you keep H1 and H2 switched, you will most likely lose broil, because the broil element will now turn off like the bake element did.
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Originally Posted by: Servicer If the heat light is on while it's not heating, it's most likely the hot wire relay. The only other components in the circuit are the elements and selector switch, which are unlikely to work intermittently.
One test you can do (while the breaker is turned off) is switch the wire from the H1 terminal, which is specific to bake, to the H2 terminal, which is specific to broil. If it is the H1 side of the HWR that's bad, the bake element should continue to heat and the broiler should start to drop out. Though the baking may heat better, it won't be perfect, because the broil element is also used during bake, but only at 50%, and it will now start to drop out. Also, if you keep H1 and H2 switched, you will most likely lose broil, because the broil element will now turn off like the bake element did. I had read another post indicating that sounded very similiar to my issue. It said hot wire relay, too. However when I posted to forum to ask where my hot wire relay might be they indicated my model Thermador PRD304 doesn't have a hot wire relay. Do you know if this correct? I have the exploding diagram specific to my unit and the corresponding parts list and none of the descriptions seem to me to be close enough in description. Also the blue heating light does come on during preheating and then when it reaches temperature goes off and then periodically continues to cycle on & off for short bursts (like normal) when trying to maintain temp.
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Originally Posted by: woocrotto I had read another post indicating that sounded very similiar to my issue. It said hot wire relay, too. However when I posted to forum to ask where my hot wire relay might be they indicated my model Thermador PRD304 doesn't have a hot wire relay. Do you know if this correct? I have the exploding diagram specific to my unit and the corresponding parts list and none of the descriptions seem to me to be close enough in description. Also the blue heating light does come on during preheating and then when it reaches temperature goes off and then periodically continues to cycle on & off for short bursts (like normal) when trying to maintain temp. You're referring to another one of my posts. Like I mentioned in my previous post, if your model number starts with PRD304, it doesn't have a HWR, and that the only ranges Thermador made with HWR's started with GCR, PRSE and PRDS. Do you have the full model number, e.g. PRD304EG/02?
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Originally Posted by: Servicer You're referring to another one of my posts. Like I mentioned in my previous post, if your model number starts with PRD304, it doesn't have a HWR, and that the only ranges Thermador made with HWR's started with GCR, PRSE and PRDS. Do you have the full model number, e.g. PRD304EG/02? The full model # is PRD304EG/05
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