H99
Panasonic
Microwave safety interlock or door sensing failure
Combination oven shows H99 and will not start microwave or combination cooking modes.
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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.
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Possible Causes
Faulty microwave door interlock switches, Misaligned door, Broken door latch, Interlock wiring fault
How to Fix / Troubleshooting
Safety: Disconnect power before accessing door interlocks. Do not bypass safety switches.
- 1. Check door closure: Ensure the door closes firmly and evenly. Look for damage to the latch area.
- 2. Listen for clicks: Slowly open and close the door; you should hear distinct clicks from the interlock switches. Missing clicks may indicate a broken switch.
- 3. Access interlock assembly: Remove the outer cabinet or front trim (per service manual) to reach the interlock switches mounted near the latch.
- 4. Test switches: With power off, remove connectors and test each switch with a multimeter for proper open/closed operation as the actuator is pressed.
- 5. Replace faulty switches: Install Panasonic-specified interlock switches only. Ensure correct orientation and secure mounting.
- 6. Verify alignment: Reassemble and check that the door actuates all switches fully when closed.
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Repair Difficulty
Hard
4/5
Required Part
Microwave Door Interlock Switch Set
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