How much does it cost to fix boiler error code 4 33?

Typical repair cost for the boiler 4 33 fault is £250-450 including labour.

4 33 High

Boiler Fault Code 4 33

Also written as 433 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 4 33 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 main internal computer has encountered a serious error and needs professional attention to restore function. (As reported on Vokera Eclipse)

Pick your boiler brand for the 4 33 fix

Vokera 4 33 1 model

Source

Information for the 4 33 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