How much does it cost to fix boiler error code 326?

Typical repair cost for the boiler 326 fault is £120-200 including labour.

326 Medium

Boiler Fault Code 326

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 326 appears across 3 boiler brands and 6 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 detect the temperature of the water in your separate hot water cylinder, which means it may stop heating your taps or cause the boiler to behave inconsistently. (As reported on Worcester Bosch 24/28/35 CDi MkII)

Pick your boiler brand for the 326 fix

ECA 326 1 model Ideal 326 1 model Worcester Bosch 326 4 models

Source

Information for the 326 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