BoilerFaultCodes 1-A6 Low
Boiler Fault Code 1-A6
Also written as 1A6 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 1-A6 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 receiving a command from your smart thermostat or heating controller that it cannot currently process, often due to a communication glitch or a sensor reading incompatibility. (As reported on Worcester Bosch Greenstar 8000 Life/Style)
Pick your boiler brand for the 1-A6 fix
Source
Information for the 1-A6 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