How much does it cost to fix boiler error code H00266?

Typical repair cost for the boiler H00266 fault is £250-450 including labour.

H00266 High

Boiler Fault Code H00266

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code H00266 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 computer brain has encountered a communication error or internal failure related to how it monitors system pressure. (As reported on Potterton Powermax HE)

Pick your boiler brand for the H00266 fix

Potterton H00266 1 model

Source

Information for the H00266 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 27 April 2026