Boiler Fault Code 0 / A

Also written as 0A — same fault.

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

Fault code 0 / 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 perfectly fine, it has simply paused for a few minutes to protect itself from turning on and off too frequently. (As reported on Ideal Maximiser SE)