Its tripping a high limit most likely. Be careful there is 2100 to 4000 volt high side with a capacitor if its not an inverter. The standard components consist of noise board, fuse, touch panel and power controller, high limits, door switches, whipper motor, fan, transformer, capacitor, transformer, magnetron, diode, plate rotator.
Discharge cap (for safety and further testing)..
Test fuse; if fuse tests blown test door switches first.
Test limits.
Check amp draw with slow blow fuse; open door to stop unit and again discharge capacitor.
Test resistance to ground on whipper, fan, magnetron, light.
Test resistance lead to lead (measurable on motors/coils/magnetron).
Test capacitor in ferrads, compare to spec on print.
Check diode forward and reverse.
Test output voltage from power control board to transformer.
Test transformer coils.
Best of luck and play safe; dont test voltage output from the transformer, voltage at capacitor or magnetron.
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