How much does it cost to fix boiler error code 1 02?

Typical repair cost for the boiler 1 02 fault is £150-250 including labour.

1 02 High

Boiler Fault Code 1 02

Also written as 102 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 1 02 appears across 3 boiler brands and 10 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's water pressure sensor is failing to provide a signal, meaning the system cannot accurately measure how much water is inside, which prevents it from firing safely. (As reported on Ariston Clas HE R)

Pick your boiler brand for the 1 02 fix

Ariston 1 02 8 models Chaffoteaux 1 02 1 model Johnson Starley 1 02 1 model

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 7 July 2026