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I have a okeefe merritt wall microwave@ TOP AN OVEN @BOTTOM. OVEN WORKS FINE ,BUT MICROWAVE WILL NOT HEAT, FAN ON , LIGHT ON, MOTOR ON BUT NO HEAT. CAN IT BE FIXED?
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It is a cooling fan used for cooling of magnatron as the temperature of magnatron rises when microwave mode is used, cooling saves this component from any defect.
see this test . God bless youThis microwave oven repair is only for over the range(OTR) models. First, with microwave still installed, gain access to the control board and check for voltage from the fan relay. If you are not getting voltage from the fan relay on the control board, and your display says fan is on, then you need a new control board. Again, this microwave oven repair is for OTR models. If you know your light bulbs are good and your display is telling you that they should be on, check the light relay on your control board. If no voltage is found at that relay, then replace the control board. Otherwise your problem is in the light socket, wiring, or wire connectors. You can get to all of that by unscrewing 6-8 screws under the unit and taking the bottom panel off.If voltage is present and the wiring that you can see looks good, then you will have to take the unit down and test for voltage at the fan itself. If the voltage is present there, then test the motor itself and/or start capacitor for the motor. The fan motor assembly will slide out of the top of the unit after you take it down and unscrew 2 screws. Below, in the list of component testing, you will see how to test the motor and start capacitor. get the part from www.repairclinic.com
Possibly the light bulb has blown, which has blown on a track on the board which has taken out the turntable motor and the fan. Also, there could be a problem with the door switch.
It looks like the part of your computer board on microwave which responsible for controlling light and fan stop working. In this case you have to replace computer board.
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