How much does it cost to fix boiler error code 87?

Typical repair cost for the boiler 87 fault is £120-200 including labour.

87 Medium

Boiler Fault Code 87

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 87 appears across 3 boiler brands and 11 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 accurately measure the temperature of your hot water, which may lead to the water being too cold or failing to heat up at all. (As reported on Ideal Isar M30 / M100)

Pick your boiler brand for the 87 fix

Alpha 87 6 models Ideal 87 3 models Keston 87 2 models

Source

Information for the 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