GE Microwave Error Code H99
Failure code indicating magnetron and/or inverter circuit problem area; appears shortly after start key is…
Failure code indicating magnetron and/or inverter circuit problem area; appears shortly after start key is pressed with no microwave oscillation.
First step from the service manual
Program DPC by pressing Clock, Timer, Start, Power Level. Then perform inverter circuit tests (Test 1 and Test 2) to isolate whether the magnetron or inverter is at fault. Use AC ampere meter for troubleshooting.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
Get the full diagnostic procedure for H99.
- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts from the OEM service manual
- Verified part numbers when replacement is required
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