The microwave seems to work its going to the time cycle likes normal operation but no heat. What could be the bad parts? Thanks.
Answer Hello AGB. 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/rectifyer should have a resistance reading in one direction only, no reistance, or resistance in both directions indicate a faulry diode. The primary winding on the trans former should read approximately 450 Ohms resistance, the secondary wonding should read 80 ohms resitance, and the filament transformer should read 100 ohms resistance. If all the readings are proper and in range, replace the magnetron.
It started with door open and MW would still run. Now with door closed clock and timer OK but no activation of MW heating.
You need to check the door switches. These prevent the unit from running with the door opened and will prevent the unit from running if any of them have failed. These should be replace at the same time. There are a total of three switches. You will need to order two WB24X829 and one WB24X830. The second part number goes on the inside at the bottom on the latch body.