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Old 09-02-2019, 09:05 AM   #1
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Built in combo microwave/oven problem


Whirlpool Model number RM280PXAQ. Microwave/combo built-in 30".
Control panel not working at all for microwave part of combo unit. The oven controls work fine and the oven works fine. Nothing happens when you press any of the microwave buttons. Digital clock DOES work.
Can I fix this or any other ideas?
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Old 09-02-2019, 09:11 AM   #2
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Re: Built in combo microwave/oven problem


Have you tried unplugging it in the hope that the board will reset. Mine is much newer but 2 or 3 times in 12 years it has just shut down for no reason.
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Old 09-02-2019, 10:29 AM   #3
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Re: Built in combo microwave/oven problem


There is probably a fuse on the control board.
https://www.partselect.com/PS366877-...earchTerm=fuse
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Old 09-02-2019, 11:23 AM   #4
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Re: Built in combo microwave/oven problem


No, I have not tried unplugging it because I would have to remove the entire unit- both microwave AND oven to get to the electrical junction box. It is not a plug in.
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Old 09-02-2019, 11:27 AM   #5
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Re: Built in combo microwave/oven problem


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Originally Posted by Libertyville View Post
No, I have not tried unplugging it because I would have to remove the entire unit- both microwave AND oven to get to the electrical junction box. It is not a plug in.
A friend had a similar unit like that and he found there was a sub panel in the cupboard below with breakers.

You could just turn the power off at the breaker for a minute.
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Old 09-02-2019, 11:49 AM   #6
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Re: Built in combo microwave/oven problem


I'll try to get to the fuse.
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Old 09-02-2019, 11:51 AM   #7
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Re: Built in combo microwave/oven problem


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Originally Posted by Nealtw View Post
A friend had a similar unit like that and he found there was a sub panel in the cupboard below with breakers.

You could just turn the power off at the breaker for a minute.

Thanks. I'll give it a try.
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Old 09-02-2019, 12:49 PM   #8
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Re: Built in combo microwave/oven problem


No luck.
I turned off the main circuit breaker for 20 minutes. Didn't help.
I also removed the control panel. I could not find a small fuse. The only fuse was a big one that appears to be for the entire unit for both the oven and the microwave. The Whirlpool parts diagram for this model did not match what I found inside.
Somewhere I had heard that the control panels for this unit were defective. Many years ago a repairman had told me that.

I have a feeling that I won't be able to fix this. The unit was installed in 1993 and the microwave broke about 10 years ago. I've just been using a countertop microwave since then- since the oven has always worked.
I don't want to install another microwave/oven combo unit.
My choice would be to have a separate microwave on a shelf above the oven and then install another built in oven. Not sure...
Thanks for ideas that have been shared.
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Old 09-02-2019, 12:56 PM   #9
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Re: Built in combo microwave/oven problem


Now you could do it with 2 units.
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Old 09-02-2019, 01:03 PM   #10
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Re: Built in combo microwave/oven problem


Thanks for the idea.
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Old 09-03-2019, 08:21 AM   #11
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Re: Built in combo microwave/oven problem


My parents' nuke box died one day and I opened it up and found a fuse had broken. Replaced it, and the thing worked again. IIRC it was one like this:

It was easily found, I think I only needed to remove the metal case to access it, no additional disassembly.
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Old 09-03-2019, 09:47 AM   #12
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Re: Built in combo microwave/oven problem


Quote:
Originally Posted by huesmann View Post
My parents' nuke box died one day and I opened it up and found a fuse had broken. Replaced it, and the thing worked again. IIRC it was one like this:

It was easily found, I think I only needed to remove the metal case to access it, no additional disassembly.

Thank you.

I looked for that fuse in the microwave and could not find it. I DID see a very large fuse which I believe handles BOTH the microwave and the oven. I've thrown in the towel and I am purchasing a new single oven and installing a separate microwave so that I won't have to deal with this combo situation anymore.

Thank you again for your suggestion.
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control board , microwave , oven/microwave combo , rm280pxaq , whirlpool combo


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