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

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

RED LED ON every 0.5-secs High

Vokera RED LED ON every 0.5-secs Fault Code

Q: What does the Vokera RED LED ON every 0.5-secs fault code mean?

Your boiler has detected a safety-related issue with its internal components or airflow and has locked itself down to prevent damage.

Also written as REDLEDONEVERY05SECS — same fault.

The Vokera RED LED ON every 0.5-secs fault code means: your boiler has detected a safety-related issue with its internal components or airflow and has locked itself down to prevent damage.. It appears on 5 Vokera models in our database.

Technical description: Final fault, e.g.: water pressure switch, condense pressure switch, fan/flue problem, limit thermostat

What causes the Vokera RED LED ON every 0.5-secs fault?

This fault occurs when the boiler's safety sensors detect that the system cannot safely move air or water through the unit. It is most commonly caused by a mechanical failure in the fan or a blockage in the flue and condensate drainage system that prevents the boiler from 'breathing' correctly. In some cases, it can also be triggered if the unit overheats due to a lack of water circulation.

This fault is more frequent during periods of extreme cold, as the external condensate drainage pipe can freeze and cause a backup into the boiler.

Typical repair cost £100-350 (including labour)

DIY fix possible

Check that the system water pressure is between 1 and 1.5 bar on the pressure gaugeTurn the mode selector switch to 'OFF/RESET' for a few seconds, then back to the heater or hot water iconEnsure the external flue terminal is not obstructed by debris or garden growth

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Vokera models that show the RED LED ON every 0.5-secs fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Vokera RED LED ON every 0.5-secs fault code information on this page is sourced and cross-checked against the official Vokera service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026