Boiler shows E13, fan runs but ignition does not proceed, often after flue or fan work.
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 first: Isolate electrical power and gas. Combustion adjustments must only be made by a qualified engineer with flue gas analysis equipment.
User-level checks:
- Visually check the flue terminal for obstructions.
- Reset the boiler and listen for abnormal fan noises.
Technical checks (qualified personnel):
- Inspect the fan for dirt, corrosion, or mechanical damage; clean or replace as necessary.
- Verify the fan speed feedback signal to the PCB (tachometer output) using a multimeter or oscilloscope.
- Check flue integrity and length against Chaffoteaux installation limits; correct any non-compliant sections.
- If fan and flue are correct, suspect a PCB combustion control fault and replace the main board.
After repair, perform full combustion analysis and adjust gas valve settings as per manufacturer’s instructions.