Question about Frigidaire FMT148GP Microwave Oven
My Frigidare microwave ...model # FMV152KWA, has a hummimg noise coming from it when door is shut and not turned on. I put cup of water in it and shut the door. The water heated up. Conclusion is humming noise is microwaves working. I assume something wrong with circuit board. Any suggestions. Thanks Dave
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Posted on Jan 02, 2017
It has a bad magnetron. This is the tube that provides the microwaves to heat the food. Not too easy to replace yourself but it can be done. Cost of magnetron is probably less than $50 or $60.
Posted on Dec 14, 2007
SOURCE: Microwave is not working
Yes. This is usually caused by either a bad door switch, a loose door switch mount, or occasionally a misaligned door hinge.
Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.
Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.
There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.
The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.
Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.
One test that sometimes helps is to gently lift up (and/or push down) on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.
If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.
You can find helpful exploded view diagrams and order parts by entering your full model number here.
There may 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 when troubleshooting & testing.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Aug 08, 2008
Hi,It is most likely the magnetron and diode that has to be replaced. This job should be done by a tech, High voltage. Magnetron's normally have a five year warranty, check your owners manual.
Posted on Mar 20, 2009
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