How much does it cost to fix boiler error code RED LED ON every 0.5-secs?

Typical repair cost for the boiler RED LED ON every 0.5-secs fault is £100-350 including labour.

RED LED ON every 0.5-secs High

Boiler Fault Code RED LED ON every 0.5-secs

Also written as REDLEDONEVERY05SECS — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code RED LED ON every 0.5-secs 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 detected a safety-related issue with its internal components or airflow and has locked itself down to prevent damage. (As reported on Vokera Compact HE)

Pick your boiler brand for the RED LED ON every 0.5-secs fix

Vokera RED LED ON every 0.5-secs 5 models

Source

Information for the RED LED ON every 0.5-secs 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