How much does it cost to fix Vokera error code b 29?

Typical repair cost for the Vokera b 29 fault is £180-350 including labour.

b 29 High

Vokera b 29 Fault Code

Q: What does the Vokera b 29 fault code mean?

Your boiler is struggling to communicate with its internal air-flow system, which prevents it from safely igniting and providing heating or hot water.

Also written as B29 — same fault.

The Vokera b 29 fault code means: your boiler is struggling to communicate with its internal air-flow system, which prevents it from safely igniting and providing heating or hot water.. It appears on 1 Vokera model in our database.

Technical description: Incorrect signal from fan

What causes the Vokera b 29 fault?

This fault occurs when the boiler's control board detects that the fan is not spinning at the required speed to safely clear exhaust gases. It is usually caused by a mechanical failure in the fan motor, a loose connection in the wiring, or a fault on the main circuit board failing to send the correct power signal.

Typical repair cost £180-350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Vokera models that show the b 29 fault code

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

Hydra Repair: £180-350

Source

Vokera b 29 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