YELLOW LED BLINKS Low

Vokera YELLOW LED BLINKS Fault Code

Also written as YELLOWLEDBLINKS — same fault.

The Vokera YELLOW LED BLINKS fault code means: your boiler is currently running in a special engineer's test mode used to check emissions and is not experiencing a mechanical breakdown.. It appears on 1 Vokera model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Chimney sweeper cycle active

What causes the Vokera YELLOW LED BLINKS fault?

This status occurs when the internal 'chimney sweeper' selector has been manually turned or left in the test position by an engineer. It physically forces the boiler to run at its highest or lowest power setting so that gas combustion levels can be measured accurately. It is not a component failure, but rather a specific operating mode used during servicing.

This is often seen shortly after an annual service or safety check if the technician forgets to return the dial to the normal heating position.

DIY fix possible

Check the mode selector dial is not set to the 'test' or 'chimney' iconTurn the selector dial to the 'OFF/RESET' position for a few secondsTurn the dial back to the 'ON' or 'Winter' position to resume normal operation

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Vokera models that show the YELLOW LED BLINKS fault code

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

Source

Vokera YELLOW LED BLINKS 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