9/b Low

Vokera 9/b Fault Code

Also written as 9B — same fault.

The Vokera 9/b fault code means: your boiler has detected a brief hiccup in its system and has automatically paused to perform a quick self-diagnostic check.. 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: Temporary fault condition
Typical repair cost £80-150 (including labour)

DIY fix possible

Turn the boiler power off at the fused spur or mains switchWait for at least 60 seconds to allow the internal memory to fully clearSwitch the power back on and see if the boiler resumes normal operation

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Vokera models that show the 9/b fault code

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

Source

Vokera 9/b 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 7 July 2026