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

Typical repair cost for the boiler Blocking fault is £120-250 including labour.

Blocking High

Boiler Fault Code Blocking

Also written as BLOCKING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Blocking appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has switched itself off because it has detected an issue with its internal safety sensors or the electrical supply, and it needs a professional to investigate the cause. (As reported on Potterton Profile 60E)

Pick your boiler brand for the Blocking fix

Potterton Blocking 5 models

Source

Information for the Blocking 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