Error code reference

Panasonic Microwave Error Code H99

Magnetron and/or inverter circuit failure detected by self-diagnostics system; appears after Start is pressed with no microwave oscillation.

SourcePanasonic NN-SN968 Microwave - Service Manualp. 21-22

Panasonic codes Panasonic microwave codes

Diagnostic procedure

The full H99 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview

First diagnostic step

Enter TEST MODE (Clock pad once → Timer pad once → Start pad once → Power Level pad once), then follow the 3/37 seconds rule troubleshooting matrix with AC ammeter.

SourcePanasonic NN-SN968 Microwave - Service Manualp. 21-22

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More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

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Where this code is documented

1 manual in the MyPros+ library documents this code for Panasonic microwave.

Models covered by the manuals that document this code

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The full H99 procedure

Where this code is documented

Models covered by the manuals that document this code

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