Question about Whirlpool MH6150XMS Microwave Oven

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Door-activated power switch is loose and/or has a short

On this 1997 or 98 model year Whirlpool, over the range, 1.7 cu ft black plastic door w/glass turntable model, there are two prongs on the door that couple with small square openings in the white interior door frame. The lower opening contains a small white plastic power switch or interlock that seems to be loose or is shorting; no switch visible in the upper opening. When the door is closed the interior oven light and fan operate non-stop even though the "cook" command is not entered, however the turntable does not spin and the microwave generator does not appear to fire up. Normally when the door is closed the oven is completely off unless a cooking command is entered. Question -- how do I access and repair or replace this switch? What is the part called? And do I have to de-install the over-range unit to make repairs or is there access to this area from underneath?

Thanks!

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Fixed this problem! The door latches were greasy and sticking in the closed position (i.e., pushed down so not latching and engaging fully when the door was closed) and this created the problems described above. Solution was to squirt some Windex into the latch holes to dissolve the grease. The switches popped back into position (must be spring-loaded) and the door closed and latched properly, allowing the oven to function properly. I swabbed out the hole with a q-tip, let it dry for 20 minutes and all is well.

Posted on Nov 18, 2008

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MicrowaveSvc
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SOURCE: What does F4 on microwave display mean?

This Kenmore is made by LG for Whirlpool. Confused yet? :D

F4 means you have an open humidity sensor.

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

To find helpful exploded view diagrams and get part numbers, you can just enter your full model number at the Sears parts site.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########

But Sears parts can usually be obtained for far less here by entering either the part number.

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

Posted on Apr 24, 2010

6ya6ya
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Posted on Jan 02, 2017

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There is an power interlock inside the oven that breaks the power connection to the magnetron when the door is open. Most likely, something is stopping the switch from opening.

Check for a small plastic probe on the door that may have broken off inside the oven keeping the circuit made. Otherwise, open the oven and see is some foreign object is keeping the connection made or if the interlock needs to be cleaned out so it can function.

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The service manual is here.

Also see my help file on door switches here.

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

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This is usually caused by either a bad door switch, a loose door switch mount (which are pretty simple problems to fix) or occasionally a problem on the control panel.

Even though a door switch clicks, it may still be bad inside.

Door switch or mount trouble is usually caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

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

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.

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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 download it here.

If you only need a switch, you can order a universal type here for $5 postpaid.

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases in about a week or so with a one-year guarantee.

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

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sounds like the door switch has been used to stop the unit while heating instead of using the stop button.
Phil

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