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Keypad on microwave wont work

My Whirlpool Microwave MH7100XYB0 suddenly stopped working.  The light in  the interior works, but the keys don't.  The word FAIL shows on the panel.  Nothing I press seems to work.  The clock and timer wont come back on.  I tried to unplug it and plug it back in and the word FAIL reappears.

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Re: keypad on microwave wont work


The microwave oven may be provided with a self diagnostic routine that can be operated

through the touch pad keyboard. To enter the self-diagnostic routine:

1.While pressing the CANCEL keypad:

a) Open the oven door.

b) Unplug the microwave oven for 2-seconds and plug it back in.

c) Release the CANCEL keypad and close the oven door. You will see the following display.


NOTE: The humidity sensor test results will appear on the display after 8-seconds.If the tests are successful, "OK " will be displayed. If one or more of the tests fail, "ERR " will be displayed.. 2.When a keypad is pressed, a number according to the test chart will be displayed. When no keypad is pressed, a blank "—" is displayed...



Power Failure: After a power failure, the WELCOME screen will be displayed.

F2 —Keyboard Failure: Refer to the Tech Sheet and conduct a touch panel continuity test.

F3H —Humidity Sensor Failure: Refer to the Tech Sheet and test the sensor.

F6 —Microwave Relay Failure: Check the microwave relay.

F7 —Microcomputer Board Failure: Change the microcomputer board.

Posted on Oct 18, 2007

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Re: keypad on microwave wont work

This may have already been dealt with, but others can benefit from an accurate, thoughtful reply to this problem.

Is it possible that some spray cleaner got into the controls?

I always recommend that users instead spray cleaner on a soft cloth then wipe the control panel.

Also, I always recommend non-ammonia cleaners since ammonia can crack and damage plastic.

Otherwise, the spray can get into the controls and lock it up or make it act odd.

If it does not dry out over time, it may need to be manually dried or blown out.

The keypad may be damaged or worn out, or control unit may be damaged.

You can find helpful exploded view diagrams and order parts by entering your full model number here:

Please write back with more details if you need further help.

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

Posted on Nov 26, 2007

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You probably have a shorted cook relay.

We regularly repair this problem with our $39.95 service, or you can order a new circuit board from the Pros here, our favorite supplier.

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Touchpad and Control Panel If the microwave buttons don't work the touchpad and control panel assembly are probably defective.

Touchpad If the microwave buttons don't work the touchpad might be at fault. Generally speaking, if the display is working and some of the buttons respond correctly but some don't, the problem is with the touchpad.
ser Control and Display Board If the microwave buttons don't work the main control board is most likely defective and will need to be replaced.

Main Control Board If the microwave buttons don't work the main control board is most likely defective and will need to be replaced.


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see this steps and use the common sense NOT feared: unppluged the power cord:
Lights come on, but can not program unit, Touchpad dead If you have a stuck key or non-responsive key, most of the time you will have to replace the keypad for this microwave oven repair. If your keypad is connected to your control board by a flat ribbon wire, try disconnecting it and clean the silver contacts with an ordinary pencil eraser. After cleaning, plug it back in and try it. If it doesn't fix it, replace the keypad unit. Some units actually have keypad tests to confirm your diagnosis of a bad key.
If your keypad and control is the same unit, replace that unit. Another note, unlike stove/oven keypads and controls, most microwaves do not have error codes or tests to distinguish whether it is truely the keypad or control. Most of the time, it is the keypad that needs replacing, but a small percentage of the time it can be the control. Check the tech sheet if they can point you to the right part.
God bless you


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Yes! the whole keypad control board will need to be replaced.

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I would strongly consider replacing the microwave oven, prices have dropped considerably. The problem you are describing is in the keypad controller board.

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1) Unplugging power and plugging back in
2) Press Cancel twice while door open (works on my Whirlpool).

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you'll have to buy a new control pad, or if you can solder you may take display out and see if the connections are broke to those buttons and solder them back.

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The manual says "while in standby mode, press and hold the '3' key on the keypad for 3 seconds until 2 tones sound and the 'DEMO' icon appears. Repeat to turn demo mode off."

You can download a copy of the manual here:

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