All functions stopped and breaker turned off. I reset it, and nothing turned back on. I suspect a fuse blew but don't really know. what do you think
Answer Bob, Yes, the 5304440780 thermal fuse may have opened and has eliminated power into the microwave. This fuse reacts to heat, so you'll need to determine what caused the microwave to overheat and open the fuse. You also need to check the door switch circuits when the door is open and closed.
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.