BoilerFaultCodesThe 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 silver flexible hose) connected to the underside of the boiler.Open the valves on the filling loop to allow water into the system.Watch the pressure gauge on the front of the boiler until the needle reaches the green zone (typically 1.0 to 1.5 bar).Close both valves firmly and ensure the boiler resets.
02
01 High Engineer
Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.
Full guide for 0103
03 High Engineer
Your boiler is failing to light the internal flame needed to produce heat or hot water.
Full guide for 0304
07 High Engineer
Your boiler has detected that water is not moving around your heating system properly, meaning it cannot safely generate heat or hot water.
Full guide for 0705
09 High Engineer
Your boiler has lost the ability to measure the temperature of the hot water it provides, so it has shut down the tap water function to prevent overheating.
Full guide for 0906
10 High Engineer
Your boiler has lost the ability to monitor the temperature of your hot water, so it has safely shut down to prevent overheating.
Full guide for 10on the Chaffoteaux Centora Green 30
Filling loopPressure relief valvePressure sensorPumpDiverter valveHeat 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