Microwave shows H98 and does not heat; sometimes accompanied by a brief humming sound.
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Safety Warning: High-voltage microwave components are extremely dangerous. Internal troubleshooting should be left to professionals.
What you can do:
- 1. Unplug immediately: If H98 appears, disconnect power and do not attempt further operation.
- 2. Inspect interior: Check the waveguide cover (small plastic or mica panel on the side wall) for burn marks or holes. If damaged, do not use the microwave until it is replaced.
Because H98 indicates a serious high-voltage or inverter fault, contact an authorized RCA service center for repair. They will test the magnetron, inverter, and related components and replace as needed.