The microwave blows cold air not hot air no heat.
Normally with an issue of a microwave not heating would be caused by a faulty magnetron. You will want to test the magnetron which should have <1 ohms of resistance. If the magnetron reads more than that or open then the magnetron would need to be replaced.
Replaced the capacitor hv it lasted about 10 days, but the capacitor was used and hv diode was used to.
It is recommended to install a new HV Capacitor and diode on the unit instead of a used one. The part number for the diode is W10138798 and the capacitor is W10492276.