Question about Frigidaire FMV157GM Microwave Oven
We have an intermittent problem: we close the door and turn it on (manual or automatic). The countdown works, but the oven does not work. We always eventually get it to work by opening the door and hitting the buttons several times, but have never figured out what causes this problem. It only happens in the mornings (after the oven has not been used for some time).
I had the problem where the timer continues to count down but turntable doesn't turn, fan doesn't come on and food doesn't heat. Holding the door up worked for awhile but even that temporary method stopped working.
I bought a door interlock switch the cost $23 from an appliance repair place and replaced it myself. It worked like a charm. To replace the switch, you need to remove 3 screws that hold the plastic grille above the door, which exposes the 1 screw that is holding the control panel. Remove that screw and slide the control panel up to remove it. There are three switches left of the panel. Note the middle swich has a different part number so I'm not sure what that one is called. The bad one on mine happen to be the bottom one. The switch is held on by a "pin" and tab that holds it in place. Push the tab and spin the switch on its "pin" past the tab to remove. Reverse your step to put the new one on. I hope this helps.
Posted on May 09, 2009
Microwave ovens use low voltage at high current to heat Magnetron filament.
Reported fault can be caused by poorly conducting Crimp joints on spade connectors to Magnetron.
Remedy is to solder wire from filament transformer to spade connectors .
Warning DANGER DANGER LEATHAL VOLTAGES
DISCHARGE HV Capacitor and disconnect from power ALWAYS
Posted on Sep 11, 2008
On our microwave we get all the functions working, but the microwave does not start.
Posted on Nov 24, 2008
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Posted on Jan 02, 2017
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Sounds like an intermittent door switch or a loose door switch mount. Very common.
At our site, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information.
See our listing here on FixYa: http://tinyurl.com/yzjozk
Oct 14, 2007 | Sharp R-9H66 Microwave Oven
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