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

Typical repair cost for the boiler Err fault is £150-300 including labour.

Err High

Boiler Fault Code Err

Also written as ERR — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code Err appears across 3 boiler brands and 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's electronic display and control panel are failing to communicate correctly, which means you cannot currently adjust or monitor your heating settings. (As reported on Glow-worm Ultracom 2 SXI)

Pick your boiler brand for the Err fix

Glow-worm Err 8 models Heatline Err 2 models Vaillant Err 1 model

Source

Information for the Err 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 31 August 2026