How much does it cost to fix boiler error code 1.A?

Typical repair cost for the boiler 1.A fault is £0-80 including labour.

1.A Low

Boiler Fault Code 1.A

Also written as 1A — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

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

Most common meaning Your boiler is temporarily running at its maximum power level, which is usually a normal setting used by engineers during testing or after a reset. (As reported on Worcester Bosch Greenstar CDi Compact)

Pick your boiler brand for the 1.A fix

Worcester Bosch 1.A 1 model

Source

Information for the 1.A 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