Chosen Solution
Suddenly I am not able to plug in my GE JVM3160 MW without the vent fan running on low. (This is NOT due to automatic heat thermostat that runs for 30 minutes if cooktop gets too hot). The vent switch will run the vent in High and Low but it will not turn Off. If the thermo-fuse is bad, will it cause this problem? How can I test it? If I try to disconnect the wires to the thermo-fuse altogether, the MW will not turn on. If I bypass the thermo-fuse with a short wire, the MW turns on but the vent fan is still running. How can I get the MW to turn on without the vent fan running on low? Many thanks, ZeroDfx
Hi @zerodfx Looking at the mini manual for the oven, the best that I can think of is that either the Low Vent relay (RY7) is permanently operated for some reason or that perhaps the relay contacts are sticking operated. Perhaps you would need to access the board and locate the Low Vent relay contacts and then with the power disconnected check if they measure short circuit i.e. 0.00 Ohms when testing between them. At normal they should test open circuit i.e. OL or infinity. Be safety aware when working in microwave ovens. Correctly discharge the HV capacitor as soon as it can be accessed after removing the oven’s cover and before doing any further work inside the oven.
