Runs but does not heat at all
Light on, turntable spinning, sound normal — food comes out cold. The most common fault: a part in the heating circuit (magnetron, high-voltage diode, capacitor, or their fuse) has failed. No home step here except one observation: is there a hum different from usual? Mention it on the call — it helps tell magnetron from diode and brings the right part on the first visit.



