Vokera A77 Fault

Vokera A77 Fault

The Vokèra A77 error code is associated with a reversible fan fault in specific models of Vokèra boilers. This error indicates an issue with the fan that is designed to reverse its direction as part of the boiler’s normal operation. The reversible fan plays a crucial role in ensuring effective combustion and the safe expulsion of exhaust gases from the boiler. A fault with this component can lead to operational issues, including safety concerns due to improper venting of combustion gases.

Causes of Vokèra A77 Error Code

  1. Faulty Fan Motor: The motor that drives the fan could be malfunctioning, preventing it from reversing direction when required.
  2. Blocked or Restricted Airflow: Obstructions in the airways or flue can hinder the fan’s ability to operate correctly, including its reversal function.
  3. Electrical Connection Issues: Problems with the electrical connections to the fan, such as loose wires or faults in the circuit, can impair fan operation.
  4. Control Board Problems: The boiler’s control board regulates the operation of the fan, including its reversing function. A fault in the control board can result in failed fan reversal.

Troubleshooting and Resolving the Vokèra A77 Error Code

  1. Inspect the Fan and Airway: Check for any visible blockages or restrictions in the airways, flue, and around the fan. Remove any obstructions found to ensure proper airflow.
  2. Listen to the Fan Operation: Attempt to start the boiler and listen for the fan. Note any unusual sounds or the absence of expected operational noises that might indicate a problem with the fan motor or its ability to reverse.
  3. Check Electrical Connections: Verify that all electrical connections to the fan are secure and in good condition. Address any issues with wiring or connections that could impact fan operation.
  4. Professional Diagnosis and Repair: Given the complexity of diagnosing and repairing issues related to the reversible fan and potential control board faults, it’s advisable to seek assistance from a Gas Safe registered engineer. A professional can accurately assess the problem, perform necessary repairs or part replacements, and ensure the boiler operates safely and efficiently.
  5. Reset the Boiler: After any corrective actions have been taken, attempt to reset the boiler to clear the error code and test if the issue has been resolved.
  6. Regular Maintenance: To prevent future occurrences of the A77 error and other operational faults, ensure your boiler receives regular professional maintenance. Routine inspections can help identify and address potential issues early, maintaining optimal boiler performance.


The Vokèra A77 error code signifies a reversible fan fault, requiring immediate attention to prevent operational and safety issues with the boiler. Due to the technical nature of fan and control board issues, professional diagnosis and repair are often necessary to resolve the fault effectively. Regular boiler maintenance is essential for identifying potential problems before they lead to significant faults, ensuring the longevity and reliability of your heating system.