Low Information
Yellow | On every 0.5 second on Vokera Compact HE

Your boiler is currently in a manual testing mode often used by engineers and is not experiencing a functional fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

Service function

What causes this fault?

This status occurs because the boiler has been manually put into 'Service Mode' using the internal control selectors. It is physically triggered when the mode selector dial is turned to the specific testing position, usually to allow an engineer to measure gas pressures without the boiler modulating. It is not a component failure, but rather a sign that a manual override is currently active.

DIY fix possible

Check if the mode selector dial has been left in the 'Service' or 'Chimney' position.Turn the selector dial to the 'OFF' position for 30 seconds.Turn the selector dial back to your desired 'Hot Water' or 'Heating' setting to resume normal operation.

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →

New boiler cost 2026

Realistic UK prices for a swap.

Read →