Have a 14 month old Fridigaire microwave (model: fgmv174kfb), which no longer heats. Lights operate, as does turntable, controls, etc. Just no heat. What are the most likely failure points to check?
Answer Hello Dan. You most likely have a "high voltage" side malfunction. Transformer, diode, magnetron, Capacitor. You will need to be extremely careful if you decide to test the components with a multi meter, Very high residual voltage is present, so make sure you remove power to the microwave and short across the terminals on the capacitor. The magnetron should have a reading of less than 1 ohm resistance across the two terminals, and an "open" circuit between each terminal and chassis ground. The diode/rectifier should have a resistance reading in one direction only, no resistance, or resistance in both directions indicate a faulty diode. The primary winding on the trans former should read approximately 450 Ohms resistance, the secondary winding should read 80 ohms resistance, and the filament transformer should read 100 ohms resistance. If all the readings are proper and in range, replace the magnetron.
I have a Frigidaire Gallery FGMV174KW. The exhaust fans keeps running. Normally, it should only come on when there is heat from the stove and then it shuts off when the it cools down. The technician says the cutout switch needs replacing.
Can you clarify if this is so and what part should I order.
If the exhaust fan thermal cutout was faulty then the fan would not work at all. The exhaust fan only comes on when you select it to come on. The fan inside the unit behind the control board would come on as it is a cooling fan when the unit is running. If the exhaust fan is staying on then the issue would be the control board that is causing the issue. For the cooling fan it could be a shorted wire or faulty control board 5304481625 that is causing it to continuously run. Thermal cutouts are non resettable and once they open they do not close.