How much does it cost to fix boiler error code 50 (ll)?

Typical repair cost for the boiler 50 (ll) fault is £150-350 including labour.

50 (ll) High

Boiler Fault Code 50 (ll)

Also written as 50LL — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 50 (ll) appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to move water through the system, either because the flow is blocked or the internal pump is not working correctly. (As reported on Ariston Clas HE 24)

Pick your boiler brand for the 50 (ll) fix

Ariston 50 (ll) 4 models

Source

Information for the 50 (ll) fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026