How much does it cost to fix boiler error code 1.87?

Typical repair cost for the boiler 1.87 fault is £150-300 including labour.

1.87 High

Boiler Fault Code 1.87

Also written as 187 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 1.87 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's control system has encountered a communication error with its internal memory, preventing the unit from starting your heating. (As reported on Johnson Starley Aquair S 10)

Pick your boiler brand for the 1.87 fix

Johnson Starley 1.87 1 model

Source

Information for the 1.87 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