Question about Frigidaire FFMV162LW Microwave Oven
Door switches test good, cap good, HV transformer good
Posted by Anonymous on
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Posted on Jan 02, 2017
For future reference, we regularly repair such control
boards and displays for
customers nationwide by mail for $39.95 postpaid in about a
week or so with a one-year guarantee.
Here's the main service manual. Other versions are here and here.
It may be grease inside one of the switches or arcing conductors (usually due to opening the door while it's cooking) making it sticky.
This was made by Sharp, so the side panel should come off each interlock switch for inspection.
But looking at the schematic, the monitor switch cannot come into play under normal circumstances unless the door is shut and the secondary interlock (relay RY2 on the control board) is closed and (oddly, if the published schematic is to be believed) if the oven lamp relay RY1 is closed .
Everything seems to point to a bizarre problem like maybe an intermittent short of a wire to the chassis, perhaps where a wire passes through a hole or guide in the sheet metal.
Also, you might consider unplugging the hood vent motor and trying it.
Did you try it with the oven powered from another outlet?
Also be sure the neutral and hot are not reversed at the outlet and that the line voltage is correct.
Sometimes a loose neutral can be a factor. Test outlets in several area of the house to see if some are high and some are low. This can be dangerous, and the power company must be called.
If there is anything else on the same breaker, that can be a factor.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
William E. Miller
Posted on Nov 29, 2009
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Some models may have a separate high voltage fuse. If this is blown, there will be no heating but no other symptoms. However, high voltage fuses are somewhat rare on domestic ovens.
A number of failures can result in the fuse NOT blowing but still no heat:
Depending on design, a number of other component failures could result in no heat as well including a defective relay or triac, interlock switch(s), and controller.
If you are interested in doing it yourself the following link will help : Microwave Repair Manual
(**All the above references to tests are found here)
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