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

Typical repair cost for the boiler Connection fault is £250-450 including labour.

Connection High

Boiler Fault Code Connection

Also written as CONNECTION — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Connection appears across 2 boiler brands and 15 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's main internal computer and the front control panel have lost their connection, meaning the unit cannot receive instructions or show you what is happening. (As reported on Vaillant ecoTEC plus Regular)

Pick your boiler brand for the Connection fix

Glow-worm Connection 3 models Vaillant Connection 12 models

Source

Information for the Connection 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