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

Typical repair cost for the boiler Blocking Error fault is £0-120 including labour.

Blocking Error Medium

Boiler Fault Code Blocking Error

Also written as BLOCKINGERROR — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Blocking Error appears across 1 boiler brand 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 temporarily paused its operation because it has detected a minor inconsistency in its internal readings, such as water pressure or temperature. (As reported on Potterton Envoy 30)

Pick your boiler brand for the Blocking Error fix

Potterton Blocking Error 2 models

Source

Information for the Blocking Error 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