Vokera Flame Signal Instability

Boiler displays error code 27, indicating intermittent lockouts, which may relate to the ionization/flame signal.

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.

Possible Causes

Poor earth, Contaminated burner, Incorrect gas/air ratio, Faulty flame sensing circuit on PCB

Safety first: Turn off power and gas. Combustion adjustments must be done by a Gas Safe engineer.

Check electrical earth: Ensure the boiler is properly earthed at the spur and consumer unit.
Engineer tasks:
- Clean the burner and check for corrosion or debris.
- Verify gas valve settings with a flue gas analyser.
- Check the flame sensor and wiring.
- Test the PCB flame detection circuitry.

Do not attempt to adjust gas valves without proper equipment and certification.

Professional Required 5/5

Main PCB (Flame Detection Circuit)

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