A08
Vokera Pump / Circulation Fault (Alpha Code)

Boiler displays A08, pump or circulation related fault, may overheat quickly

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Seized pump, Airlock, Blocked system, Incorrect pump speed setting

How to Fix / Troubleshooting

Safety first: Isolate power and allow boiler to cool.

  • Check pressure: Ensure system pressure is correct.
  • Bleed pump and radiators: Remove air from the system.
  • Engineer checks:
    • Verify pump operation and current draw.
    • Clean system filters.
    • Assess for sludge and consider system cleaning.

Running with poor circulation can damage the heat exchanger.

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Repair Difficulty

Hard 4/5

Required Part

Circulating Pump
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