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 to operate safely.
What to try first
Locate the filling loop (usually a silver braided hose with one or two valves underneath the boiler)Slowly open the valve to allow water to enter the system until the pressure gauge reads between 1.0 and 1.5 barClose the valve tightly and check that the error code clears
02
01 High Engineer
Your boiler has detected that it is running too hot and has automatically shut down for safety to prevent damage.
Full guide for 0103
03 High Engineer
Your boiler is trying to start but cannot sense the flame required to heat your water or radiators.
Full guide for 0304
07 High Engineer
Your boiler has detected that water is not flowing around your heating system properly, so it has shut down to prevent itself from overheating.
Full guide for 0705
11 High Engineer
Your boiler has stopped working because a sensor that measures the water temperature for your radiators has likely disconnected or broken.
Full guide for 1106
12 High Engineer
Your boiler's temperature sensor is failing to provide a reading, so it has shut down to prevent overheating.
Full guide for 12on the Chaffoteaux Centora Green System 24
Pressure relief valveExpansion vesselPressure sensorNTC Temperature SensorCirculation PumpHeat 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