Question about Frigidaire PLMV169DC Microwave Oven
Out of the blue our microwave now trips the fuse panel breaker when you push the start button to try and heat something. The unit is not quite 2 years old and not sure about the warranty yet so thought i would see what i could find out about troubleshooting the problem.
A microwave can be dead for many reasons.
If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open. Then when it cools, it closes the circuit and allows power through again.
If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder.
If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.
If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.
If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.
If you or a friend decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk
You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383
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Posted on Feb 25, 2008
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
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If you find the fuse blown or circuit breaker tripped, unplug everything from the circuit to which the microwave is connected (keep in mind that other outlets may be fed from the same circuit). Replace the fuse or reset the circuit breaker. If the same thing happens again, you have a problem with the outlet or other wiring on the same branch circuit. If plugging in the microwave causes the fuse to blow or circuit breaker to trip immediately, there is a short circuit in the power cord or elsewhere.
The microwave oven may be powered from a GFCI outlet or downstream of one and the GFCI may have tripped. (Removing a broken oven lamp has been known to happen.) The GFCI outlet may not be in an obvious location but first check the countertop outlets. The tripped GFCI could be in the garage or almost anywhere else! Pushing the RESET button may be all that's needed.
Next, try to set the clock. With some ovens the screen will be totally blank following a power outage - there may be nothing wrong with it. Furthermore, some ovens will not allow you perform any cooking related actions until the clock is set to a valid time.
Assuming these are not your problems, a fuse has probably blown although a dead controller is a possibility.
While you can do some repairs on your microwave, what you don't know can kill you... even on an unplugged microwave, so make sure you understand the dangers and how to reduce them before you try anything inside a microwave. If you want to do more yourself, go to the link at the top of this post.
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