How much does it cost to fix Vokera error code b 19?

Typical repair cost for the Vokera b 19 fault is £150-250 including labour.

b 19 High

Vokera b 19 Fault Code

Q: What does the Vokera b 19 fault code mean?

Your boiler has detected that the water returning from your radiators is dangerously hot, causing it to shut down to prevent damage.

Also written as B19 — same fault.

The Vokera b 19 fault code means: your boiler has detected that the water returning from your radiators is dangerously hot, causing it to shut down to prevent damage.. It appears on 1 Vokera model in our database.

Technical description: Return sensor above 95 °C

What causes the Vokera b 19 fault?

This fault occurs when water cannot move through your heating system quickly enough to carry heat away from the boiler, causing the temperature to spike. The most common reasons are a failed internal pump that has stopped spinning or a physical blockage in the pipework that is restricting the flow of water.

This fault is frequently seen at the start of autumn when heating systems are turned back on after months of inactivity, which can cause the pump to seize.

Typical repair cost £150-250 (including labour)

DIY fix possible

Check that all radiator valves are fully openEnsure there are no obstructions to the air ventsReset the boiler using the control knob once the system has cooled down

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Vokera models that show the b 19 fault code

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

Hydra Repair: £150-250

Source

Vokera b 19 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