Question about Whirlpool MH7140XF Microwave Oven

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The microwave displays F-6 and won't stop unless it's unplugged. Needless to say, it can't be used.

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  • Whirlpool Master
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F6
Shorted temperature probe
This code will occur if temp. probe is detected as shorted
continuously over 5 seconds.
Replace temperature probe. part no 29 Thermostat
Part Number: AP3038826 made by WHIRLPOOL
The above part and all other parts of your model can be foundin the link
http://www.appliancepartspros.com/partsearch/model.aspx?model_id=260444&diagram_id=28263369#d28263369

Posted on Jan 01, 2011

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Posted on Jan 02, 2017

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I too have this problem with my KitchenAid KHHS179LSS-5 model. Based on the owner's manual I located behind the grill which pulled off, the F7 Error code indicates that power to the magnetron was interrupted. You will want to make the following checks: 1. Unplug microwave oven or disconnect power. 2. After 40 seconds, check to see whether this solves the problem. 3. Unplug microwave oven or disconnect power. 4. Check resistance of the magnetron thermostat. 5. Check the magnetron. 6. Check wiring to the 1100W inverter and control system. See "Checking Inverters." 7. Plug in microwave oven or reconnect power. 8. Check operation of all interlock switches. Check door, hinge and cavity front alignment. Adjust as needed. 9. Unplug microwave oven or disconnect power. 10. If switches operate correctly, replace 1100W inverter. 11. If problem persists, replace electronic control. 12. Plug in microwave oven or reconnect power.

After removing the control display, there is a virtual zoo of connectors. So unless you repair microwaves on a regular basis, it may be difficult to ascertain which ones go to the magnetron thermostat. I will probably resport to shelling out the dough to get someone to fix it. Sorry I couldn't be more helpful.

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Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean, solder and reset the board. Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron. Check this link to know how a microwave works:

http://www.espares.co.uk/advice/microwave/a/5/1443/how-a-microwave-oven-works.html

So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off. Check the wave guide covers, if food had deposited
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Now keeping clear of the microwave, switch on; use a cup of water inside to test.
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If you have warranty use it asp, from the description the problem is in the keypad "membrane shorting" or the microprocessor control board is becoming intermittent, it will get to the point and stop functioning.

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Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

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You have a shorting membrane keypad.

If and when an oven is coming on or doing anything by itself, this is very dangerous and can result in a fire.

So until it is repaired, please leave it unplugged or leave the door open when it's not in use, and please do not leave it running unattended.

FixYa's Web site is currently not notifying us when replies to our Clarification Requests are posted, so please reply directly to me with your full number from the tag on the unit and your oven's color so I can help you with free do-it-yourself tips and/or an estimate.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

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Well I had the same problem. It made me start unplugging a microwave when it wasn't in use, which is always a plus.
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