How much does it cost to fix boiler error code EE4?

Typical repair cost for the boiler EE4 fault is £80-140 including labour.

EE4 High

Boiler Fault Code EE4

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code EE4 appears across 2 boiler brands and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected that the electrical wiring coming into the unit is connected the wrong way round. (As reported on Grant Vortex)

Pick your boiler brand for the EE4 fix

Grant EE4 2 models Worcester Bosch EE4 1 model

Source

Information for the EE4 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