How much does it cost to fix boiler error code i2?

Typical repair cost for the boiler i2 fault is £120-220 including labour.

i2 High

Boiler Fault Code i2

Also written as I2 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code i2 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 has stopped heating your radiators because it is unable to accurately read the current water temperature inside the system. (As reported on Sime Metropolis DGT 25 BF)

Pick your boiler brand for the i2 fix

Sime i2 1 model Worcester Bosch i2 1 model

Source

Information for the i2 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