Question about Thermador SC302T Electric Double Oven

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Lower oven do not heat on bake or broil - Thermador SC302T Electric Double Oven

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  • resservicesl Dec 31, 2010

    First I never said problem started with self clean operation ,we always use the upper oven & to my knowledge the self clean was never used.

    2nd the thermo switch I already checked it's fine.

    About 2 years ago I replaced the main led board.

  • resservicesl Dec 31, 2010

    display control works fine- clicks and the blower runs just no element heat.

  • resservicesl Jan 01, 2011

    the only apparent problem; no power to the elements----no codes showing

    where are the limit switches ?

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  • Thermador Master
  • 2,605 Answers

Hi,

Welcome to FixYa.


I`d start by looking for an over-temp cut-out tripped. Since this problem started following a self clean cycle, it leads me to believe it is just that.

Here`s what and where to look for for this,

Fortunately if it is tripped, they are the manual reset type and are accessible behind the black grill/vent just above the lower door next to the lock latch assembly.

**Turn off the 40amp breaker at your service panel or sub-panel in the home before attempting any service...safety first**

With the power off, you should be able to remove the grill and push the red button in the center of the thermostat and that should fix your problem...as shown here,
lower oven do not heat on bake or broil - macmarkus_192.jpg If indeed the hi-limit is tripped you`ll know immediately because you`ll feel it click as you push it down. It will look like the image below...


52bc5ab.jpg


Ultimately it could be a faulty relay board or related to the timer, but I`d start with the hi-limit cut-out tripped first.

Other than that if you call in a pro, I'd suggest you be sure they are an authorized B/S/H/ service provider ( B/S/H/ is the parent company for Bosch, Thermador, Gaggenau, Siemens products ).

Let me know and I`ll watch for your reply and respond as soon as I can. Good luck.

Regards,

Macmarkus :)

Posted on Dec 31, 2010

  • 2 more comments 
  • Mark MacDonald
    Mark MacDonald Dec 31, 2010

    Hello again,

    Sorry about that, my bad. I had your post confused with another...a negative side effect to my profession, many ovens on my mind lol :)...So let me back up then. I see you made no mention of an error code, so can you possibly elaborate on the series of events to this point ? The display control both ovens, so when you select either bake or broil there is so response ? OR it responds as if it where heating but never does ? Do you hear any "clicks" on & off, or the blower come on ( lower cooling fan ) ? I should also add, so I'm not assuming, you know their are seperate hi-limits for the upper & lower ovens ? and it wouldn't necessarily be tripped due to a self clean cycle...I've reset what where thought to be good hi-limits after power outages and such. Let me know and I'll try and help in any manner I can from here.

    Regards,

    Macmarkus :)

  • Mark MacDonald
    Mark MacDonald Dec 31, 2010

    Hello again,



    I'm still wondering if you can address the other things I asked and mentioned...It's important to be clear as there are a great many things which can effect the functions you're missing.



    Any error codes ?



    You know their are separate hi-limits for the upper & lower ovens ?



    Thank you.



    Regards,



    Macmarkus :)

  • Mark MacDonald
    Mark MacDonald Jan 01, 2011

    Hello,



    Thank you for the response. Based on your reply ( no power to the elements no codes showing )


    I'd say it certainly sounds like the hi-limit has been tripped.



    **Again, Turn the power off at the breaker panel or power source...safety first**



    The hi-limit for the upper oven is behind the upper door latch grill, the lower is located in the same area in relation to the lower oven as shown here...








    You should be able to access the lower one by way of removing the grill screws between the upper and lower oven, as shown here...careful not to pull the wires off the door switch, or mark them, take a picture etc.






    Once you've pushed the hi-limit to reset, give it a try and let me know the results. If it doesn't resolve the issue, you'll need to check the thermostat itself.



    1) You can perform this by "jumping it out/by-pass it ( for test only ) or with the aid of an ohmmeter...Set the ohmmeter to Rx1 scale.



    2) Remove one wire, doesn't matter which one.



    3) Touching the meter to the leads should move the meter showing continuity.



    4) If there is no reading, remove and replace the thermostat. Part number 1433863, available at "repairclinic.com" for around $20USD and includes what is shown here...








    I've got my fingers crossed for you. Good luck. I'll watch for your post.



    Regards,



    Macmarkus :)














  • Mark MacDonald
    Mark MacDonald Jan 01, 2011

    Don't know why my first image didn't go through. Hopefully it works this time.





    This is what you should have seen...














    Macmarkus :)


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SOURCE: KENMORE GAS STOVE OVEN LOWER BURNER WON'T WORK

First look to see if the ignitor is coming on. Most common problem is the ignitor is weak or just bad. When the power is applied to the ignitor it glows and builds up resistance to open the gas valve then it lights. If the ignitor is weak or bad it will not build up enough resistance for gas to come into the burner. One sign of this would be a "woosh" sound when it trys to light. If the ignitor is coming on but not lighting it is most likely the ignitor is bad. Should have a full glow. Also, if the ignitor looks whiteish in color this is a sign of it going bad. You can compare to the broil ignitor to be sure. If the ignitor doesn't come on at all will need to see if you have power to the ignitor. Let me know what you find and let's solve it before you rate the solution.

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SOURCE: OLD GE Wall Oven doesn't heat properly

On these older ovens ther is usually always 120 volts on the elements at all times.
If you check across the element ends with it in bake you should read 240V. If not, there is a problem with the control. With the voltage drop you describe, it sounds like you are losing power on one line of voltage coming to the element.
Post back to let me know what you find out or if you have any questions.

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SOURCE: KENMORE GAS STOVE OVEN LOWER BURNER WON'T WORK

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SOURCE: fridgiaire Gallery series Model GLEB30T8CBA lower elements dont work

I replaced the relay board for the top oven (the one with the transformer) and it works properly now. My issue was only for the top oven so you probably have to replace both relay boards since both ovens have only the top element working.

318022002 is the part number for the relay board with transformer
318022001 is the part number for the relay board without transformer

Yes the one without the transformer is more expensive for some reason.

The boards are on the top of the oven, I was able to pull out the oven about 75% of the way out of the cabinet and easily get to the boards. Just unplugged the connections and plugged them into the new board.

To get the oven out there are two small screws that go into brackets inside the top oven door. Highly recommend taking the doors off the oven to pull it out, much easier to work with.

NOTE: On my old board I noticed one solder joint that was burned out and I since I already had the new board I just replaced but you might want to check that first and see if just a solder fix gets you working again before you spend $$ on a new board.

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SOURCE: GE JTP 1580W288 Set oven to Bake, switches to broil at bake temp

The F2 Error code means the oven has detected an excess temperature condition. Most often this is due to a bad temperature sensor - the sensor costs about $75 from an online repair site. 
How to remove and replace the temperature sensor. In most GE ovens, when you open the door, you'll see the rod-shaped temperature sensor sticking out of the back wall at the upper left. It's about six inches long and a bit more than 1/8" in diameter, held in place with two screws. 

Turn off the circuit breaker (built-in ovens) or unplug the range before attempting the replacement. 

The replacement sensor will come with instructions, but basically it's a matter of removing the sensor, pulling out the wires to where they are connected and disconnecting them. You may have to snip. The replacement sensor will come with high-temp wire nuts to hold the new connection. Polarity doesn't matter; it's a straight resistance thermocouple. Hook it up, be sure you poke the connections back far enough so that they're on the other side of the thermal insulation and not resting against the back of the oven. 

If you continue getting the F2 error after replacing the sensor, then the problem is likely in the control module - this is the circuit board behind the keypad and clock. 

You'll need to remove the decorative bezel to get behind the control panel. Remove screws and set off parts in order - it's not complicated. Once the bezel is off there are two more screws that hold the panel in place. Then you can lift the panel up about a half inch and pivot it forward toward you. You'll see a bunch of wires going to a circuit board. 

On the panel you will notice some black plastic boxes that say "Potter & Brumfield" on them. These are relays. Check the relays - slide the black plastic cover straight up to expose the coil and the contacts. The coil, when energized, closes the contacts - look at all the relays. You can manually close the contacts with your finger (be gentle). If the contacts of one of them are stuck, they might be welded together. You can fix the problem by prying apart the welded contacts gently with a knife blade. Take some time to gently polish the relay contacts with a folded bit of fine grain sandpaper - this will get some more life out of them. Be gentle and careful - the relays aren't complicated but if you bend the contact or rip it out, you'll have to replace the controller, which will set you back a couple hundred dollars. If you unstick and burnish the relays, they will probably eventually weld together again as the rough spot will spark, but when you burnish them with sandpaper they should be good for some more life before they need to be replaced. 

If the problem isn't the temp sensor or welded relay contacts then the problem is obviously somewhere else, but temp sensor and relay contacts will account for the lion's share of F2 errors. 

Once again, be safe, be careful, be gentle. Ovens are not very complicated and they're tough, but always exercise care. Always disconnect electricity before messing with them.
good luck,

Posted on Jun 28, 2009

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1 Answer

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Understand that I am not a professional, so this answer is subject to revision by someone who is more knowledgeable.

Where I live now I'm on Natural Gas, but in the past I've had electric stove/ovens. Based on my best recall the situation you describe is NOT abnormal.

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