E133
Baxi
Ignition Lockout / Gas Supply Fault
Boiler shows E133, no ignition, may have tried to light several times, often after gas supply interruption
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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
Gas supply interruption or low pressure, Air in gas line after supply off, Blocked Baxi gas valve inlet filter, Faulty ignition electrode or flame sensor
How to Fix / Troubleshooting
Safety first: If you smell gas, turn off the gas at the meter, ventilate the area, and call the gas emergency number.
User checks:
- Check that other gas appliances (hob, fire) are working. If not, contact your gas supplier.
- Ensure the boiler gas isolation valve is fully open.
- Press the reset button once and wait for the boiler to attempt ignition.
- If the boiler has recently been off or the gas meter was changed, it may take a couple of ignition attempts to clear air from the line. Do not reset more than a few times.
If E133 persists and other gas appliances work:
- A Gas Safe engineer should check the gas valve, burner, ignition electrode, and flame sensor, and verify inlet gas pressure.
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Repair Difficulty
Hard
4/5
Required Part
Ignition Electrode and Flame Sensor Assembly
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