How much does it cost to fix boiler error code 3.3?

Typical repair cost for the boiler 3.3 fault is £150-300 including labour.

3.3 High

Boiler Fault Code 3.3

Also written as 33 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 3.3 appears across 1 boiler brand and 4 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 flame needed to heat your home, so it has safely shut itself down to prevent any gas build-up. (As reported on Worcester Bosch Greenstar R29 40 HE)

Pick your boiler brand for the 3.3 fix

Worcester Bosch 3.3 4 models

Source

Information for the 3.3 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