How much does it cost to fix boiler error code 50 ❍, red ❍?

Typical repair cost for the boiler 50 ❍, red ❍ fault is £150-350 including labour.

50 ❍, red ❍ Emergency

Boiler Fault Code 50 ❍, red ❍

Also written as 50RED — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 50 ❍, red ❍ appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected a flame signal even though it has commanded the gas to turn off, which is a safety concern that requires an immediate check. (As reported on Ariston Clas One)

Pick your boiler brand for the 50 ❍, red ❍ fix

Ariston 50 ❍, red ❍ 2 models

Source

Information for the 50 ❍, red ❍ 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