How much does it cost to fix boiler error code E6?

Typical repair cost for the boiler E6 fault is £150-450 including labour.

E6 High

Boiler Fault Code E6

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code E6 appears across 3 boiler brands and 20 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has shut down because it cannot safely vent exhaust gases or draw in fresh air, usually due to a blockage in the flue pipe or a hardware failure. (As reported on Viessmann Vitodens 333)

Pick your boiler brand for the E6 fix

Ideal E6 1 model Remeha E6 11 models Viessmann E6 8 models

Source

Information for the E6 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