Checking for experiences with error code F24 on the above Thermador double oven. I realize the glass keypad part #474083 most likely needs replacing but some have also indicated the power relay board behind the keypad also needs to be replaced. Do both need to be replaced or just the keypad itself? I am also looking for a schematic for the above unit. Thanks for any help.
Hello,
Does F24 occur within 2 minutes of applying power to the oven?
Do any keys work at all?
Is the bezel grounded?
Gene.
Upon applying power the clock sign blinks, no keys respond and within 2 minutes error code F24 appears. None of the keys work and I am not sure whether the bezel is grounded (how do I test?). The top oven was used and upon pushing the stop/off key, the screen went blank. Then the clock signal began flashing and later the error code F24 flashed. Shutting power off, even for days, and then on again does not reset the system. I know Thermador says that a bad/stuck key will cause the problem. Others have also indicated that at times the relay board may also go bad when this happens. I did get to remove the control panel and press on the back of each key to see if I could unstick any stuck key but to no avail.
I don’t think it has something to do with the relay board. It is possible that the clock/display board is involved too but I would replace the glass control panel first.
If your oven is 27" wide then the 474083
you posted is correct.
If it is 30" wide then the control panel 474079
Gene.
Thanks, Gene. I will order the part soon (27 inch oven) and give it a try.
I received part #474083 as suggested from Appliance Pros. The mounting screws enclosed with the panel (documentation says to use enclosed screws) do not work because the mounting brackets on the panel are not threaded. Thus the panel cannot be mounted to the control board. The old screws also do not work with the new panel since there are no threads to screw into.
I still tested installation of the new panel to determine if the panel is the culprit.
Since the screws would not work, I used twist ties to temporarily attach the panel to the control board and installed the unit back into the oven. Blinking clock, no response to keypad buttons and F24 again appears. Need more pro help with both the F24 issue as well as the issue with ineffective mounting system.
— Begin quote from stampede;806429
…Since the screws would not work, I used twist ties to temporarily attach the panel to the control board and installed the unit back into the oven…
— End quote
This installation is absolutely incorrect because the panel has to be very good grounded and it could be only if it is installed properly with all screws in place.
In regards of your question about screws you have to talk to the APP customer service. I also will forward it to their research department.
I found some Thermador instructions for this problem. You may want to verify if it may be applied to your oven: "Random keys and F24 errors can occur on rare occasions from either build ups of static on the bezel (when ungrounded) and occasionally from local AM radio stations, particularly from stations 1000KHz and above if they are located near the installation of the oven.
In certain locations, the keys and F24 can happen very often, almost continuously when power is applied to the oven. This happens when located very close to an AM radio station of medium to high power."
Gene.
No radio or other possible interfering unit nearby. Unfortunately, there is no way to attach it with the screws supplied because the mounting bracket with the screw holes is very hard material and even a self threading screw from the old panel would not cut a thread. I called APP about this issue with the screws and was referred back to the forums for possible resolution. I appreciate your getting back to me so quickly on this, Gene. Frank
Frank,
It looks to me like this problem is well known by Thermador. I believe it is a poor design issue. You may want to get in touch with Thermador customer relations department and force them to take care of it. Especially if the replacement part made by them does not fit properly.
Gene.
I received a second part and was able to replace the panel with the screws tight. The new touch panel did not do the trick-still get flashing clock with no touchpad response, then flashing error code F24.
I did contact Thermador about their part that had no threaded screw holes and the customer service put their head in the sand-would not even discuss it or recognize it-just referred me to a local repair company.
Hi Frank,
I’m sorry to hear it. I knew that the Thermador customer service is one of the worst in the appliance industry.
Per the instruction issued by Thermador for their technicians (attached to the post) one of the solutions for this problem is to replace the display board with a special 2.67MHz field fix board. I could not find any part numbers for this board.
May be you will get any idea after reading these instructions. I have not.
Gene.
Thanks, Gene; Do you know how to ground the bezel per the BSH field service instructions or temporarily ground to test whether the bezel is grounded?
You can connect the oven chassis to any closest house water pipe or faucet using a 12 GA (#6) insulated copper wire.
If it will fix the problem, you have to check the junction box behind the oven for the proper grounding.
Gene.
I have a similar issue with my Thermador double oven (C302U). The difference is my oven happens to work perfectly until several hours after being heated. Toward the end of heavy usage when the entire unit is basically heat soaked the until will turn off and beep repeatedly. F24 is displayed on the clock on occasion, not always, more often than not there is no error code. Generally the buttons on the right side of the control panel do not work, the rest of the buttons do work normally. When the oven cools, all buttons return to working order and the oven works normally until heat soaked when the same behavior is observed.
Do you have an idea to what the issue could be given it is caused by something different than this other user?
Thanks.
We own a Thermador double oven, model C302 and have had this same problem for years. We’ve tried three different service calls by two different companies, have replaced hinges, control panels and multiple other parts, yet the beeping continues. We finally read of a trick that works like a charm - when you are finished using your oven, turn it off and immediately turn it back on to a temperature of 100 degrees. Let the oven cool down to that temperature and then turn it off after a while. No beeping. Pain in the neck but only thing we were able to get to work.
Almost identical symptoms. But also, sometimes the oven just turns off, sometimes keys stop responding. The cool down at 100 usually works. Sometimes just banging the panel gets the keyboard back. I guess I’ll check the grounding and connectors and then replace the control and relay boards.
My last post was from 2015 and I’m happy to say that we replaced our Thermador double ovens in 2016. We put up with the issue for years, dumping all kinds of money into new door hinges, new control panels, and various other "non-fixes". There is an issue with these ovens and it is a shame that Thermador hasn’t recognized it. We will never buy another Thermador product. We are delighted Wolf customers now.
janellrhee said:
…There is an issue with these ovens and it is a shame that Thermador hasn’t recognized it. We will never buy another Thermador product. We are delighted Wolf customers now.
Brilliant decision!
I know I’m about 6 years late to this party, but in case there are any more Thermador CM302 or C302 ovens out there that have not already been hauled off to the landfill site I have some information to pass on that could be a big help.
I had problems with my original "Double Oven Control Display Board (#486915) in 2014 and replaced the board, then the new board started acting up 10 years later. The symptoms are similar to others reported here - an hour or so after turning off the oven the panel becomes disabled and starts beeping constantly until you shut off the breaker or until it cools off again (the panel gets hot after the oven is shut off because the ventilation fan shuts off, allowing heat to rise to the panel). Sometimes I saw error code F24, sometimes not.
Since Thermador doesn’t offer replacement parts any more and I didn’t want to throw out an otherwise working oven, I inspected the display board and found a lot of cold solder joints on the connector pins. A cold solder joint is a latent defect that results from an inadequate soldering process (usually not enough heat but possibly other causes). Cold solder joints are particularly susceptible to failure during temperature cycling, and often result in an intermittent problem because the joint pulls apart with thermal expansion and shorts together again when it cools and contracts. Anyway, on the largest connector, P1, I could see (under magnification) cold solder joints on 13 of the 19 pins. I re-soldered all the connectors and re-installed the board and all is well now.
Out of curiosity, I pulled out the original board that I had replaced 10 years ago and indeed it had a lot of cold solder joints as well. That board exhibited different symptoms, but most likely that’s just because the joint that failed first was not on the same pin that failed first on the newer board.
Unfortunately it seems the soldering process was not good and a lot of boards were probably manufactured with the same latent defect (my boards were 10 years apart and were different revisions but both had the same defective joints). Depending which joints go open-circuit first, this could result in different failure symptoms.
It’s a real shame that Thermador did not figure this out in their repair and/or customer service process, when I was able to do so at my kitchen table. Surely if they had, they would have swapped out and reworked the boards that were giving so many customers problems. Had they done that they could have built some brand loyalty from customers who felt well taken care of. Instead I think there are a lot of "I’ll never buy another Thermador" people out there (myself included).
If you’re having problems and you haven’t yet dumped your oven at the landfill and shelled out thousands for a new one, try removing this board and just get a friend-of-a-friend with reasonable electronics soldering skills to re-flow the solder joints on the connectors (about a 5 minute job).
I’d like to post some photos but it doesn’t look like I can post images from my computer. But I’ll keep them around in case anyone’s interested. They show some excellent examples of bad workmanship. Also, thanks to Appliance Parts Pros for making this forum available - I only wish I could have found and reported this issue sooner.
Let’s see if this photo works: https://ibb.co/NNXsW1c