Question about Whirlpool Microwave Ovens
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Posted on Jan 02, 2017
F7 means that the control panel is not getting feedback from the Switched Mode Power Supply (high-voltage inverter).
This could be due to a problem with the inverter or the control unit / circuit board, but it appears to be the latter in most cases.
We repair microwave control boards for customers nationwide with our guaranteed $39.95 service.
We have full details, plus critical safety, disassembly, and troubleshooting info at our site. You'll find a link to our site in our listing here on FixYa: http://tinyurl.com/yzjozk
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.
You may reply back with your brand and model number if you'd like us to look into this further, or feel free to contact me directly if you need more help.
We're happy to help and we appreciate your thoughtful rating of our answer.
William E. Miller, AS-EET
Posted on Jun 29, 2008
If you measure across the varistor leads with it still in the circuit, you should measure around 100-300 ohms, which is the DC resistance of the primary of the low voltage transformer.
If you read infinity / open the primary of the low voltage transformer is bad.
If the varistor is bad, it will be shorted and usually it will be cracked or split. This is a much simpler way to test the varistor.
Have you checked the magnetron thermal cutout (TCO) (or thermostat if so equipped) and the oven TCO? These are the leading causes of a dead GE when the fuse is okay.
You didn't mention the model number. What is it?
Please reply back here if you still need help.
We're happy to help you. Once we have all your information and offer a final solution, we'd appreciate your thoughtful rating of our answer.
Posted on Jul 18, 2008
If unit is built-in reove screws holding unit to cabinet.
Slide out about 2 inches to access 3 screws holding grill.
Remove grill to get to two screws holding control panel.
Fuse is behind control panel,
Posted on Mar 17, 2009
Check contacts to control board first.
If control board is OK then test the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.
Thediode and capacitors can br tested. The capacitor must bealloweddischarge before testing, or you risk to get electrocuted, evenifpower is off. Capacitors can get discharged by shorting theirtwocontacts.
Before replacing the magnetron test also the control board.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.
All locations, and description of this parts can be located using the diagram here: Counter top.
Parts must be tested to find out what is wrong.
Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.
Regarding parts, contact the seller here to purchase parts.
Posted on Apr 27, 2009
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