Question about Microwave Ovens
I'll bet the letters are "PF", as in power failure, right?
If it is going dead, sounds like the magnetron is overheating and opening the thermostat.
This can be caused when the internal cooling fan is not running or by a magnetron that is failing.
When I say internal cooling fan, I do not mean the hood vent exhaust fan which you can turn on and off manually.
I'm instead talking about the internal fan which comes on automatically whenever you microwave.
It is vital that the cooling fan runs, or the magnetron will be destroyed.
If you or someone you know 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.
You can usually find helpful exploded view diagrams and order parts by entering your full model number here.
There should 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 Dec 02, 2008
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Posted on Jan 02, 2017
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That does indeed sound like the mag is overheating and the thermostat is tripping, but it's probably not the steam.
Do you feel a good amount of air flowing through the vents?
If the cooling fan is not running or the air vents are blocked, that wil allow the magnetron to overheat.
If air flow is not a problem, then you may have a defective magnetron.
Assuming it's still under warranty, it would be best to let a Magic Chef-authorized servicer handle it.
For more help from Magic Chef / Ewave : http://www.mcappliance.com/ ; Contact page http://www.mcappliance.com/contactus/contactus.asp ; Order
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