BoilerFaultCodesWhat the manual says
Manufacturer manualAir in the pump Restricted CH flow due to air or a circuit restriction
Shared across the Alpha E-Tec range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
DIY fix possible
Check your boiler pressure gauge and top it up to 1.5 bar if it is low using the filling loopBleed all the radiators in your home starting from the lowest floor to the highestRestart the boiler and check if the error code clears
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Related fault codes
All 30 fault codes on the E-Tec NX
Seeing a different code? Every code this model can display, in one place.
Related guides you might find useful
How to bleed a radiator
Quarter turn on the valve, wait for water, then check the boiler pressure.
Read →Hot water works but heating does not
On a combi it is usually the diverter valve. On a system boiler, the motorised valve.
Read →Banging, kettling or whistling noise
Each noise points to a different fault.
Read →