BoilerFaultCodes 1 02 High
Boiler Fault Code 1 02
Also written as 102 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 1 02 appears across 1 boiler brand and 9 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling to detect the water pressure inside the system because the sensor that monitors it is either faulty or unable to get a clear reading. (As reported on Ariston Clas HE 24)
Pick your boiler brand for the 1 02 fix
Source
Information for the 1 02 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