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

Typical repair cost for the boiler ON every 0.5-secs fault is £90-180 including labour.

ON every 0.5-secs High

Boiler Fault Code ON every 0.5-secs

Also written as ONEVERY05SECS — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code ON every 0.5-secs appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is signalling a temporary issue, which is often caused by the water pressure being too low or a blockage in the internal air vents. (As reported on Vokera Compact HE)

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

Vokera ON every 0.5-secs 1 model

Source

Information for the 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 7 July 2026