Vokera A09 Fault

Vokera A09 Fault

The Vokèra A09 error code indicates a problem with false flame detection. This error occurs when the boiler’s control system detects a flame signal when there should not be one, typically during times when the boiler is not attempting to ignite. This false detection can interfere with the proper operation of the boiler, including preventing it from firing up correctly.

Causes of Vokèra A09 Error Code

  1. Electrical Interference: Electrical noise or interference within the boiler’s electronics can sometimes be misinterpreted as a flame signal by the control unit.
  2. Faulty Flame Detection Circuit: A malfunction in the flame detection circuit, including the flame sensor or associated wiring, can produce incorrect flame signals.
  3. Control Board Issues: Problems with the boiler’s printed circuit board (PCB) can lead to incorrect processing of signals, including false flame detection.
  4. Residual Charge in Electrodes: Sometimes, residual electrical charge in the ignition electrodes can mimic a flame signal to the detection system.

Troubleshooting and Resolving the Vokèra A09 Error Code

  1. Inspect Wiring and Connections: Check the wiring related to the flame detection circuit for any signs of damage, loose connections, or interference. Ensure all connections are secure and in good condition.
  2. Clean the Flame Sensor: The flame sensor should be inspected and cleaned. Accumulation of dirt or carbon deposits on the sensor can sometimes contribute to false readings.
  3. Check for Electrical Interference: Look for potential sources of electrical interference near the boiler and eliminate them if possible. This includes other appliances, wiring, or electronic devices.
  4. Reset the Boiler: Attempt to reset the boiler to clear the error code and re-initiate normal operation. Consult the boiler manual for specific reset instructions.
  5. Professional Diagnosis: Due to the complexity of diagnosing electrical or PCB-related issues, it’s advisable to contact a Gas Safe registered engineer if the problem persists after basic troubleshooting. A professional can conduct a thorough examination and undertake necessary repairs or adjustments.
  6. Regular Maintenance: Ensuring your boiler receives regular professional maintenance can help prevent issues like false flame detection by keeping all components clean and in good working order.


The Vokèra A09 error code related to false flame detection is a significant issue that can affect the boiler’s functionality. While some troubleshooting steps can be performed by the homeowner, such as inspecting wiring and cleaning the flame sensor, resolving the underlying cause often requires professional expertise, especially when dealing with potential PCB issues or electrical interference. Regular boiler maintenance is crucial for preventing such problems and ensuring efficient and safe operation.