How much does it cost to fix boiler error code E84?

Typical repair cost for the boiler E84 fault is £80-200 including labour.

E84 Medium

Boiler Fault Code E84

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code E84 appears across 2 boiler brands and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is slowing down its performance because it has detected that the gas pressure coming into the unit is too low to run at full power. (As reported on Warmhaus Enerwa / Priwa)

Pick your boiler brand for the E84 fix

Baxi E84 1 model Warmhaus E84 1 model

Source

Information for the E84 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