How much does it cost to fix boiler error code 9?

Typical repair cost for the boiler 9 fault is £90-180 including labour.

9 High

Boiler Fault Code 9

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code 9 appears across 6 boiler brands and 13 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has temporarily stopped working because a safety device wired into the system, such as a room thermostat or external timer, is signaling that something needs attention. (As reported on Remeha Selecta)

Pick your boiler brand for the 9 fix

Ariston 9 1 model Ideal 9 1 model Potterton 9 1 model Remeha 9 7 models Vaillant 9 2 models Worcester Bosch 9 1 model

Source

Information for the 9 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 31 August 2026