How to Fix / Troubleshooting

Gas safety: Only qualified gas technicians should alter gas type settings or burner orifices.

1. Confirm gas type:
- Check the rating plate on the heater for the intended gas type (LPG or NG).
- Verify with your gas supplier which gas is supplied.
2. Check DIP switch settings (qualified persons):
- Turn OFF power and remove the front cover.
- Locate the DIP switches on the main PCB.
- Compare their positions with the installation manual for the correct gas type and altitude.
3. Inspect burner for blockage:
- Check for dust, insects, or rust on the burner ports.
- Clean gently with a soft brush and vacuum.
4. If unit was recently converted: Ensure the correct Panasonic orifice kit was installed and combustion was adjusted with proper instruments.
5. Persistent H12: Requires professional combustion analysis and possible PCB replacement by an authorized Panasonic technician.

Heater shows H12; may be associated with incorrect gas type or combustion adjustment issues.

Possible Causes