Common problems guide

The most common Chaffoteaux Flexiflame 140 problems

The faults most likely to send a Chaffoteaux Flexiflame 140 into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

This model is discontinued. Parts can be harder to source and expensive. If repair costs are mounting, a new A-rated boiler may be the smarter choice.
11 documented codes
6 most common
1 DIY-safe checks
5 engineer needed

The 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.

Est. cost
£90-160
Parts
Gas valve, Ignition lead, PCB
Full guide for Pilot will not light - 1
02
Pilot will not light High Engineer

Your boiler is failing to ignite because it cannot detect or receive the gas needed to start the flame.

Est. cost
£120-250
Parts
Pilot injector, Pilot assembly, Ignition electrode
Full guide for Pilot will not light
03
Complaints of noise High Engineer

Your boiler is making unusual noises because of trapped air, poor water circulation, or potential issues with the gas control components.

Est. cost
£150-350
Parts
Central heating pump, Gas valve, Heat exchanger
Full guide for Complaints of noise
04
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.

Est. cost
£90-180
Parts
Gas valve, Flame rectification probe, Ignition electrode
Full guide for Pilot will not light (2)
05
Pilot will not light (1) Emergency Engineer

Your boiler is failing to ignite because it is not receiving a flow of gas.

Est. cost
£120-250
Parts
Gas valve, Ignition electrode, PCB
Full guide for Pilot will not light (1)
06
Complaints of noise (1) Emergency Engineer

Your boiler is receiving too much gas, which is causing it to run inefficiently and create unusual, loud noises.

Est. cost
£150-300
Parts
Gas valve, Burner manifold
Full guide for Complaints of noise (1)
Parts most often replaced

on the Chaffoteaux Flexiflame 140

Gas valveIgnition leadPCBPilot injectorPilot assemblyIgnition electrode

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
See the full 11-code list for the Chaffoteaux Flexiflame 140

Related guides

Boiler losing pressure → No hot water → When to replace → Symptom checker →