General Repair Steps
Power Cycle: Unplug the unit for 60 seconds to reset the control board.
Visual Inspection: Look for loose connectors, burnt components, or discolored wiring.
Test Fuses: Check thermal or ceramic fuses for continuity using a multimeter; a resistance of less than 1Ω is typical for a good fuse.
Replace Parts: If a component like the door switch or magnetron is clearly damaged, it should be replaced with an exact rated part