Common problems guide

The most common Chaffoteaux Centora Green 24 problems

The faults most likely to send a Chaffoteaux Centora Green 24 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.
17 documented codes
6 most common
1 DIY-safe checks
5 engineer needed

The 6 most common faults

01
08 High DIY-safe

Your boiler has stopped working because the water pressure inside the heating system has dropped too low.

What to try first

Locate the filling loop (a flexible metal hose) underneath the boiler.Open the valves on both ends of the loop to allow water to enter the system.Monitor the pressure gauge on the front panel until the needle reaches the green zone (typically 1.5 bar).Close both valves tightly and remove the loop if required.

Est. cost
£80-150
Parts
Filling loop, Pressure relief valve, Expansion vessel
Full guide for 08
02
01 High Engineer

Your boiler has detected that it is running too hot and has automatically shut down to prevent any internal damage.

Est. cost
£120-250
Parts
Circulation pump, NTC thermistor sensor, Primary heat exchanger
Full guide for 01
03
03 High Engineer

Your boiler is failing to ignite because it cannot detect a flame, meaning you currently have no heating or hot water.

Est. cost
£120-250
Parts
Ionisation electrode, Ignition lead, Gas valve
Full guide for 03
04
07 High Engineer

Your boiler has detected that water is not moving through the system properly, which is preventing it from heating your home safely.

Est. cost
£150-300
Parts
Central heating pump, Diverter valve, System filter
Full guide for 07
05
09 High Engineer

Your boiler has lost the ability to tell how hot your tap water is, so it has safely stopped heating it to prevent overheating.

Est. cost
£120-200
Parts
DHW NTC Sensor, Wiring harness
Full guide for 09
06
10 High Engineer

Your boiler is currently unable to sense the temperature of your hot water properly, which means it has stopped heating it to prevent the system from overheating.

Est. cost
£120-200
Parts
Domestic Hot Water (DHW) NTC Thermistor
Full guide for 10
Parts most often replaced

on the Chaffoteaux Centora Green 24

Filling loopPressure relief valveExpansion vesselCirculation pumpNTC thermistor sensorPrimary heat exchanger

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 17-code list for the Chaffoteaux Centora Green 24

Related guides

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