0A Low

Boiler Fault Code 0A

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 0A appears across 2 boiler brands and 13 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 pausing between firing cycles to prevent the system from turning on and off too frequently, which protects the internal components from unnecessary wear. (As reported on Ideal Maximiser SE)

Pick your boiler brand for the 0A fix

Ideal 0A 1 model Viessmann 0A 12 models

Source

Information for the 0A 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