Question about Frigidaire Microwave Ovens
You should look at the door switches, door switch mounts, and test the high-voltage capacitor for a shorted condition.
If the fuse blows as soon as you press the start button, you have a shorted high-voltage capacitor.
If the fuse blows a while after the start button is pressed, you may have a defective high voltage transformer.
If the fuse or circuit breaker blows when you open or close the door, then you need to look at the door switches and the door switch mounts.
There are plenty of good videos on YouTube the show you how to test a high-voltage capacitor. even though capacitors contain a bleeder resistor which will discharge them very quickly, it's a good idea to discharge the capacitor and there are videos about that as well.
You can find helpful Frigidaire parts diagrams and get parts at affordable prices for most models from The Pros by entering your model number here:
Posted on Jun 30, 2019
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Posted on Jan 02, 2017
SOURCE: Microwave blows fuse
The most common suspects are the high voltage transformer and the magnetron. It's also possible you have a flaky door switch or loose door switch mount. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your model number here: http://tinyurl.com/gv383
Posted on Jun 08, 2007
SOURCE: microwave / Frigidare PLMV
What size breaker is protecting the circuit? Per the National Electrical Code, a microwave and a washing machine should each have their own dedicated circuit (and own breaker) rated at 20 amps. Also, if the breaker is old and has tripped many times due to continuous overloading, it may be weakened and could be tripping at a lower amperage than what it is rated. I would try the following:
1. If possible, test the microwave on another circuit and see if it trips that breaker. If possible, use a 20 amp circuit for the test.
2. If you're comfortable with working in an electrical panel safely, place a clamp on ammeter on the hot wire of the affected circuit in the panel and see how much current is being drawn when the microwave is on.
3. If you would rather stay out of the panel, get an inline ammeter/watt meter and plug the microwave into this. If the rating of the microwave is less than 15 amps (1800 watts), you may be able to use a device called a kill-a-watt at a local hardware store. This will show how much power is actually being used by a given appliance.
Posted on May 28, 2009
In all likelihood the mangnetron has failed, or perhaps even the Power Supply. or a fault that is shutting the system down for safety reasons You need to have it serviced by a reputable service centre/man.
Ensure you get a firm "Quote" before proceeding, and remember these days the cost of repair can equal or exceed the price of a new one.
Posted on Feb 19, 2010
Chances are you have a shorted "monitor" interlock switch, or its mount is broken.
See this door switch help file.
You can find links to helpful exploded view diagrams and part ordering help here.
To give you more specific help, we would need the brand name and
full model number of your microwave.
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Posted on Sep 06, 2012
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Thank you for your post, Steve Shaw!
From what you have described it sounds like a possible faulty wiring harness, control panel, or magnetron within your Frigidaire microwave. I would recommend having a professional out to provide a proper diagnosis. This will help to avoid unnecessary part purchases. -Matt
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