Boiler shows E13, fan may run but ignition is inhibited, often related to flue or combustion safety.
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: Combustion and flue work must be carried out by a Gas Safe engineer. Do not operate the boiler if you suspect flue problems.
User checks:
- Visually inspect the external flue terminal for obstructions.
- Ensure no building work or extensions have altered the flue clearance requirements.
Engineer checks:
- Inspect the entire flue system for correct assembly, slope, support and sealing according to EHC instructions.
- Check the flue temperature sensor or thermostat for correct resistance and secure mounting.
- Verify combustion with a flue gas analyser and adjust gas valve if necessary.
- Replace faulty flue temperature sensor or thermostat with EHC-approved parts.
Never bypass flue safety devices. Resolve the underlying flue or combustion issue before resetting the boiler.
Repair Difficulty
Required Part
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