How much does it cost to fix boiler error code 8/1/5?

Typical repair cost for the boiler 8/1/5 fault is £150-250 including labour.

8/1/5 High

Boiler Fault Code 8/1/5

Also written as 815 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 8/1/5 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 has detected a faulty electrical connection or a broken sensor that monitors its internal water flow, causing it to stop working for safety reasons. (As reported on Worcester Bosch GB162)

Pick your boiler brand for the 8/1/5 fix

Worcester Bosch 8/1/5 1 model

Source

Information for the 8/1/5 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