Question about Whirlpool MH7140XF Microwave Oven

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Error message f3h on the sensor menu and won't heat on any other setting. Not certain of the model # aside from what's given below.

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Sorry to read about your problem, I hope this helps you out.
Your error code means your humidity sensor is defective.

1. Hold the CANCEL pad down while opening the door.
2. Unplug the power supply cord from the wall outlet for two seconds and plug it back in.
3. Release the CANCEL pad then close the door.
4. By pressing each of the pads on the control panel, the numeral 8 will appear in the display to indicate that the circuits are complete and all relays are working.
5. The pads that control the oven and cooktop lights, in addition to the hood fan, will also turn these components on and off for a visual indication that the circuits are operating properly.

Microwaves must be serviced by technicians due to the inherent dangers involved in repairing these appliances. Internal capacitors can retain a lethal electrical charge even though the unit is completely unplugged. A microwave radiation leakage test must be performed on the unit following any internal component repair.

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Posted on Jan 03, 2011

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F3H means you have a failing humidity sensor, but the first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If that doesn't work, leave it unplugged for about 5 minutes. Then let us know if the hard reset does not fix it.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

If you don't find yours, or if you want to look at it without disassembling the oven, you can usually download it here.

You can usually find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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F3H is a humidity sensor error.

The first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again. If that doesn't work, leave it unplugged for maybe an hour.

If it still fails, you have a bad sensor.

You can usually find exploded views and order parts by entering your model number at the Sears parts site.

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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You may be able to clear the error by unplugging the oven for a couple of minutes. Then plug it back in, reset the clock and try again.

If it still has the error after a reset, please write back so we can give you another suggestion.

We're happy to help you and we'd appreciate your thoughtful rating of our answer.

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I found the fix to the F3H error on another site. Just turn the power to the microwave off for ~2 minutes at the circuit breaker, and then turn it back on. Microwave will start working again then.

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