Vokera A06 Fault

Vokera A06 Fault

The Vokèra A06 error code indicates a flue overheat fault within the boiler system. This error occurs when the temperature in the flue exceeds safe operating limits, which can happen due to a variety of reasons. The flue is an essential component of the boiler, responsible for venting exhaust gases outside the building. An overheat situation in the flue is a serious concern as it can affect the safe operation of the boiler and potentially pose a risk to property and occupants.

Causes of Vokèra A06 Error Code

  1. Flue Blockages: Obstructions in the flue, such as bird nests, debris, or a buildup of soot, can restrict the flow of exhaust gases, leading to overheating.
  2. Incorrect Flue Installation: If the flue has been installed incorrectly or if there are issues with the flue configuration, it can impede the proper venting of gases, causing an increase in temperature.
  3. Faulty Fan: The fan aids in expelling exhaust gases through the flue. A malfunctioning fan can lead to inadequate expulsion of gases, contributing to flue overheating.
  4. Heat Exchanger Issues: Problems with the heat exchanger, including blockages or faults, can also lead to increased flue temperatures as heat is not effectively transferred to the water.

Troubleshooting and Resolving the Vokèra A06 Error Code

  1. Inspect the Flue for Blockages: Check the flue for any visible obstructions that could be causing the overheating. Remove any blockages found, ensuring the flue is clear for gases to be vented properly.
  2. Verify Flue Installation: Ensure the flue has been installed according to the manufacturer’s specifications. This may require inspection by a professional, especially for issues related to internal flue configurations.
  3. Check the Fan: Assess the operation of the fan to ensure it is functioning correctly. A faulty fan may need repair or replacement by a qualified technician.
  4. Inspect the Heat Exchanger: Look for signs of blockage or damage in the heat exchanger. A professional may be needed to clean or replace the heat exchanger if it’s contributing to flue overheating.
  5. Reset the Boiler: After addressing any potential causes of the flue overheating, attempt to reset the boiler to clear the error code and re-initiate normal operation.
  6. Seek Professional Assistance: If the A06 error persists or if you’re unsure how to address the issue, it’s advisable to contact a Gas Safe registered engineer. Flue and heat exchanger issues, in particular, require professional diagnosis and repair to ensure safe boiler operation.


The Vokèra A06 error code is a critical indication of flue overheating, necessitating prompt attention to ensure the safety and efficiency of the boiler system. While some checks can be performed by homeowners, such as inspecting the flue for blockages, resolving underlying issues often requires professional intervention. Regular maintenance and inspections can help prevent flue-related problems and maintain the safe operation of your heating system.