• ** REMEMBER! **The microwave can still shock you even unplugged!!

    ALWAYS discharge the high-voltage capacitor first if you even think your hands will come close to any HIGH VOLTAGE components.

    Jeff mentions this: Anything in the high voltage ( magnetron, capacitor, diode, wires to and from ):
    ...Use a metal ( not the shiny chrome type ) screw driver with a insulated handle to short across ( touch both at the same time ) the terminals of the high voltage capacitor to discharge it.

    From Jeff's site: http://www.applianceaid.com/component-testing.php

    Jake
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FPBM3077RFB Frigidaire Microwave - Replaced fuse and thermal fuse, now fan is constant. How can i fix this?

justsomedude

Premium Member
Joined
Jan 2, 2021
Messages
4
Location
AMERICA
Model Number
FPBM3077RFB
Brand
Frigidaire
Age
1-5 years
I have a model no. FPBM3077RFB Frigidaire microwave

Microwave kept popping the breaker, then stopped working all together. So I took it all apart and checked for continuity in all the fuses, and the door switches. Everything checked out besides the thermostat fuse ( KSD1 40/70) (no continuity between the terminals) so I bought another one that was described as a "Frigidaire Microwave Transformer Thermostat" and says KSD 130 on the back, tested it and it was good. I also replaced the blown fuse 20amp 125v with a 20amp 250v replacement. I double checked my connections, I checked the fan fuse for continuity with my multimeter and its good. The microwave runs great now, operates as if normal but the fan wont turn off.

The fan will adjust from high, medium, and low, but once i press the off button it still stays on a low mode. I have no idea what to do from here? Any help appreciated. Thank you!
 

justsomedude

Premium Member
Joined
Jan 2, 2021
Messages
4
Location
AMERICA
...looks like I'm alone on this one. I bought another thermal fuse approved by the company and a fan fuse as well. I'll be swapping them both out and hoping that it may fix the problem.
 

justsomedude

Premium Member
Joined
Jan 2, 2021
Messages
4
Location
AMERICA
I'll probably unplug all my connections as well and put them back in. I'll maybe post if I resolve the issue...maybe not being that I'm talking to myself.
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
116,020
Location
McMullen Valley, Arizona
@rickgburton is the expert on Microwaves, he should be here shortly.

I know nothing about microwaves or I would help you.

Jake
 
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