BoilerFaultCodes LO2 High
Boiler Fault Code LO2
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code LO2 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 is likely unable to drain away the condensation it produces naturally, causing it to 'choke' and shut down. (As reported on Ideal Logic Code Combi ESP1)
Pick your boiler brand for the LO2 fix
Source
Information for the LO2 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