BoilerFaultCodesThe 6 most common faults
01
Pilot will not light - 1 High DIY-safe
Your boiler is failing to ignite because it is not receiving any gas to create the flame needed for heating.
What to try first
Check that your gas supply is turned on at the main meter, especially if you have recently had new appliances installed or a gas supply interruption.Ensure your gas service valve located near the boiler is in the open position.Reset the boiler using the dedicated reset button on the control panel after verifying gas supply.
02
Pilot will not light (2) High Engineer
Your boiler is struggling to start because there is still some air trapped in the gas pipes, preventing the pilot light from igniting.
Full guide for Pilot will not light (2)03
Pilot will not light (3) High Engineer
Your boiler is failing to ignite because internal debris is blocking the tiny gas supply line responsible for starting the flame.
Full guide for Pilot will not light (3)04
Pilot will not light - 2 High Engineer
Your boiler is struggling to start because there is air trapped in the gas pipes, preventing the burner from igniting.
Full guide for Pilot will not light - 205
Pilot will not light - 3 High Engineer
Your boiler is failing to ignite because internal debris is preventing the gas from reaching the pilot light.
Full guide for Pilot will not light - 306
Complaints of noise - 7 High Engineer
Your boiler is struggling to circulate water properly, which is causing it to make rattling or banging noises.
Full guide for Complaints of noise - 7on the Chaffoteaux Flexiflame 140
Gas valveIgnition leadPCBFlame rectification probeIgnition electrodePilot injector
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Chaffoteaux shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue