Question about Whirlpool WMH1162XVS Microwave Oven

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Relay 4903 4903 relay problems

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  • Whirlpool Master
  • 9,047 Answers

If the cook relay (#4903) is shorting, you get an "F6" error.
That can be repaired.

Posted on May 03, 2013

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My over the stove microwave starts continues for a few econds the f-7 appears and it stops


F7 means power to magnetron is interrupted.

I don't recommend that someone without experience and an understanding of the safety procedures undertake troubleshooting this.
You can find manuals and helpful exploded view diagrams for your model here and my favorite parts supplier is here. There is a technical sheet hidden behind the controls that has helpful technical and troubleshooting information. It will say something like this:

F7 Power to magnetron interrupted

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 cooling fan operation
5. Check the magnetron.
6. Check P65 connection on the relay control board.
7. Check the P56/P66 connection between relay board and relay control board.
8. Check wiring to the 1200W inverter and control system. See "Checking Inverters."
9. Check operation of all interlock switches.
10. Replace all parts and panels before operating.
11. Plug in microwave oven or reconnect power.
12. Check voltage at 4903-1 on relay board. If it is 120, unplug microwave oven or disconnect power.
13. Replace inverter.
14. Replace all parts and panels before operating.
15. Plug in microwave oven or reconnect power.
16. If problem persists, unplug microwave oven or disconnect power.
17. Replace relay control board.
18. Replace all parts and panels before operating.
19. Plug in microwave oven or reconnect power.
20. If problem persists, unplug microwave oven or disconnect power.
21. Check for reversed plug connection on controls or loose wiring.
22. Replace all parts and panels before operating.
23. Plug in microwave oven or reconnect power.

William E. Miller, AS-EET
http://www.MicrowaveControl.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"

Oct 05, 2016 | Kenmore Microwave Ovens

1 Answer

Inside light won't go off and allow unit to work


The interior light stays on during the cooking process. You could be right about an interlock problem but also the internal fuse could have blown.

Dec 16, 2013 | Whirlpool MH1160XS Convection/Microwave...

1 Answer

How do i fix a whirlpool microwave and range hood combo


869a8192-23d2-4ffd-9f6d-9d352dca9204.pngWhat is the model number? F-6 is a Microwave Relay Failure.
1. Check wiring to Relay 4903 for short circuits.
2. If wiring is OK:
• Unplug microwave oven or disconnect power.
• Replace electronic control.
• Plug in microwave oven or reconnect power.
Sea Breeze

Jul 25, 2013 | Microwave Ovens

2 Answers

Whirlpool GH5184XPS Microwave Oven F7 error, trips circuit breaker


Check the high voltage capacitor, it normally shorts, "discharge with screwdriver" unhook one side and set meter to ohms. Check high voltage diode tied into one side of the capacitor, "unhook from chassis ground" set meter to ohms and check for short, sometimes cracks, "must be replaced" If the diode is open meter does not have enough forward bias to check.

Apr 01, 2012 | Whirlpool Microwave Ovens

1 Answer

ERROR CODE F6 SOUNDS LIKE IT RUNNING. UNPLUGGED IT AND PLUGGED IT IN AND WHEN I SHUT THE DOOR SAME OLE


Hello lyle,

The reason your microwave comes up with the error code f6 is simply because there is a shortened key, also know as a bad relay. I bet you have a kenmore microwave oven there.

It will act like it is about to start working, sometimes, the tray would roll inside the oven, but will not work.

You need to check wiring to relay 4903 for short circuit, then correct the short circuits you seen.

Hope this helped you.
All the best.
Elect_Comp

Dec 12, 2011 | Microwave Ovens

1 Answer

It wasnt working at no display nothing, i took down and cleaned real good now im getting a F6 code


Funny that a cleaning would revive a totally dead microwave! Never would have guessed. On microwaves manufactured by whirlpool, F6 apparently means "Microwave relay failure. Check wiring to relay 4903 for short circuits."
Talk to your local service shop and see if they will replace a microwave relay... they should be able to give you a parts and labour estimate before they begin so you will know what you are in for.

Oct 21, 2010 | Whirlpool MH1150XM Convection/Microwave...

1 Answer

Microwave is humming when off display says F6


We had a power failure for 2+ hours. I went to defrost something when the power came back on. Somewhere along the line the F6 popped up. With the door closed it sounded like the machine was running.
I slapped the side too and it worked. I pulled the vent cover off to clean it and found the tech sheet stuffed in a bag inside. I found what F6 means. 'Microwave relay failure. Check wiring to relay 4903 for short circuits. If wiring is ok, replace control board' Then, of course, a whack on the side by the button panel worked
just as well. rek('_tx6');
Reference: It means the relay is stuck in the run position. Apparently if you slap the unit hard enough it will unstick the relay and allow it to work properly again. rek('_tx7');

Aug 06, 2010 | Kenmore Microwave Ovens

1 Answer

Error message


The F6 error code on your microwave oven is a relay failure.

Check wiring to relay 4903 for short circuits. If wiring is OK - replace the control board.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question

Oct 14, 2009 | Kenmore 61701 Microwave Oven

1 Answer

Works for approx 30 secs then it cuts off with a error Code F7 message.


Assuming yours is a model KHMS2050SSS0, here is what the technical sheet says about the F7 error code:

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 cooling fan operation
5. Check the magnetron.
6. Check P65 connection on the relay control board.
7. Check the P56/P66 connection between relay board and relay control board.
8. Check wiring to the 1200W inverter and control system. See “Checking Inverters.”
9. Check operation of all interlock switches.
10. Replace all parts and panels before operating.
11. Plug in microwave oven or reconnect power.
12. Check voltage at 4903-1 on relay board. If it is 120, unplug microwave oven or disconnect power.
13. Replace inverter.
14. Replace all parts and panels before operating.
15. Plug in microwave oven or reconnect power.
16. If problem persists, unplug microwave oven or disconnect power.
17. Replace relay control board.
18. Replace all parts and panels before operating.
19. Plug in microwave oven or reconnect power.
20. If problem persists, unplug microwave oven or disconnect power.
21. Check for reversed plug connection on controls or loose wiring.
22. Replace all parts and panels before operating.
23. Plug in microwave oven or reconnect power.

(This troubleshooting guide presumes one does not know how to test electronic components. That's why they say to replace and part and check it again.)

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

If yours is a different model number, please reply back.

May 26, 2009 | KitchenAid KHMS2050SSS Microwave Oven

3 Answers

Mh1150xmt-0 whirlpool f6 error code


I had this same error. It appeared to be a stuck relay. With the door open, unplug the microwave. Then whack on either side of the keypad a couple times. This fixed mine.

Dec 16, 2008 | Whirlpool MH1150XM Convection/Microwave...

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