BoilerFaultCodes 308 557 Medium
Boiler Fault Code 308 557
Also written as 308557 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 308 557 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 likely having trouble reading the temperature setting because the control knob is faulty or incorrectly positioned. (As reported on Ideal Mexico Super CF3 40-80)
Pick your boiler brand for the 308 557 fix
Source
Information for the 308 557 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