BoilerFaultCodesThe 6 most common faults
01
08 High DIY-safe
Your boiler has detected that there is not enough water inside the heating system to operate safely.
What to try first
Locate the external filling loop (a flexible silver hose) connecting your cold mains to the heating pipework.Open the filling valve slowly until you hear water entering the system and the pressure gauge on the front of the boiler rises to 1.5 bar.Close the valve tightly and check that the fault code has cleared.
02
01 High Engineer
Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent any damage or safety risks.
Full guide for 0103
03 High Engineer
Your boiler is failing to light the internal flame needed to heat your home's water.
Full guide for 0304
07 High Engineer
Your boiler is struggling to move water through its heating system, which means it cannot heat your home safely.
Full guide for 0705
11 High Engineer
Your boiler has stopped heating your home because a sensor that measures the water temperature has disconnected or failed.
Full guide for 1106
12 High Engineer
Your boiler's temperature sensor is failing to provide a reading, so the system has shut down as a precaution to prevent overheating.
Full guide for 12on the Chaffoteaux Centora Green System 30
Pressure sensorFilling loopPumpDiverter valveHeat exchangerNTC thermistor
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