Medium
61 on Alpha Intec 50CS

Your boiler is struggling because air bubbles are trapped inside the system, preventing the water from circulating properly to heat your home.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description

Air in the pump - Restricted CH flow due to air or a circuit restriction

DIY fix possible

Check your boiler pressure gauge and ensure it is between 1.0 and 1.5 barBleed all radiators in your home starting from the lowest floor to the highestTop up the system pressure again to 1.5 bar if it dropped while bleedingRestart the boiler to see if the error clears

Find a Gas Safe engineer
Search the official register →

Related fault codes

60View →62View →

Related guides you might find useful

Boiler keeps losing pressure

Six most common causes of dropping pressure.

Read →

Banging / kettling / whistling noise

Each noise points to a different fault.

Read →

Radiators cold at the bottom

Sludge build-up — needs flushing, not bleeding.

Read →