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Microwave will not turn on after selecting time and hit start button

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The control panel seems to be working fine. I can select cook cycle and seconds and the timer will count

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Old 11-07-2008, 08:40 AM
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Question Microwave will not turn on after selecting time and hit start button
Model Number: RM288PXP   Brand: Whirlpool   Age: More than 10 years   

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The control panel seems to be working fine. I can select cook cycle and seconds and the timer will count down and triple beep when complete. I have checked all the door switches and they seem to be good. I have checked ohm readings on the 20 amp fuse and the thermal fuses and they seem to check OK. I am puzzled as to why the microwave refuses to radiate even though all these areas have been checked to be operational. What other parts could cause the microwave not to heat if the parts I described are in good working order? What other checks should I do and what other parts could be the culprit? I checked circuit board and there are no burn spots or evidence of bad components. in addition, I have viewed all parts such as transformer and magnetron and not able to see any visual problems.


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  #2 (permalink)  
Old 11-07-2008, 08:46 AM
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Even though your door switches appear to be fine, one of them is bad, most likely the top switch.
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Old 11-07-2008, 09:23 AM
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I have mechanically checked and visually inspected the switches one by one and unless there is an internal problem with the switch itself, I think it may be something else. Each switch makes full contact and is fully depressed when the door is closed. I am able to see and hear each switch fully connect. I would be willing to go get a new switch, but it appears they are working fine.

Could the problem be traced to the HV capacitor or the HV diode?
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Old 11-07-2008, 09:33 AM
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No, it cannot be the cap or diode, You cannot just do a visual inspection of an electrical part to see if it is bad, that's why they make test equipment. You have 3 switches in there 2 must be closed and one open when the door shuts, this is for safety, and when one of those switches fail, it will not activate the High Voltage side of the microwave. This is to keep people from running the Microwave with the door open.
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Old 11-07-2008, 08:27 PM
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abdfish66,

I wanted to let you know that I fixed the problem. I was resting different resistors and capacitors on the circuit board and noticed that a square yellow box near the transformer appeared to have one pin that did not appear to be soldered correctly. So I cleaned the pin and resoldered the pin. The microwave know works perfectly. I wanted to thank you for your assistance even though it was not the switches. Thanks for responding

Ted
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Old 11-07-2008, 10:30 PM
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Well Im glad you found it. 99% of the time it is a door switch. I'm courious what the yellow box is your talking about, is it the low voltage transformer, or a relay?
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Old 11-09-2008, 03:39 AM
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iT APPEARS TO BE THE RELAY
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Old 11-15-2008, 11:02 AM
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Question door switch?

HI threre. I think I have the same problem, but am not as technically inclined as this poster. How can I check/verify it is just the door switch? Everything on the machine works fine (fan, light, timer).
Should I be looking for something?
THanks
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