Boiler Fault Code ALL 92

Also written as ALL92 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026

Fault code ALL 92 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's internal computer has detected too much air in the system while trying to run at a low power setting and has locked itself out to prevent damage. (As reported on Sime Murelle Revolution 30)