E09
Baxi
Gas Valve / Burner Control Fault
Boiler shows E09 and locks out, no heating or hot water
Advertisements
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.
Advertisements
Possible Causes
Faulty Baxi gas valve coil, Incorrect gas valve calibration, Wiring fault between PCB and gas valve, PCB output failure to gas valve
How to Fix / Troubleshooting
Critical safety notice: The gas valve is a safety-critical component. Do not attempt to adjust or replace it yourself.
User checks:
- Reset the boiler once only. If E09 returns, do not continue resetting.
- Confirm that other gas appliances work normally to rule out a general gas supply issue.
Professional actions:
- A Gas Safe engineer will test the gas valve, check supply pressures, and verify correct operation.
- If the valve or PCB is faulty, they will replace and commission the new component using Baxi’s procedures and combustion analysis.
Advertisements
Repair Difficulty
Professional Required
5/5
Advertisements