Jim for Model Number GE PVM9179sf1ss My GE convection over the range microwave keeps blowing the main fuse. If I put in a new fuse, the light work (both inside and out), along with the vent motor (all speeds), the control panel buttons, clock and all beeping noises. The problem occurs when I press start: the microwave starts for a have a second, makes a buzzing noise, and then everything goes dark (requiring me to replace the main fuse again. I tried to check all three door lock switches and the thermo fuses. From what I read on the internet it could be the main control board. Is there anyway to verify that this is the problem? Would hate to spend $150+ for the board and have the microwave still not work. Many thanks in advance for the helping hand.... Jim
Answer Jim, It sounds as if you have a shorted diode or magnetron. I would recommend isolating the high voltage by disconnecting a wire to the primary side of the high voltage transformer (tape it good before applying power to the unit) then see if the unit runs without blowing the fuse, if so then it is likely that either the diode, capacitor, or magnetron is shorted. If it blows the fuse then it is more likely to be a control issue. Read More... Answered by AppliancePartsPros.com | Monday, September 14, 2020