Vokera A41 Fault

Vokera A41 Fault

The Vokèra A41 error code typically indicates a fault with the return thermistor in specific Vokèra boiler models. The return thermistor measures the temperature of the water returning to the boiler from the central heating system. A fault with this component can lead to issues with the boiler’s ability to accurately regulate the heating system’s temperature, which might affect the efficiency and comfort of your home heating.

Causes of Vokèra A41 Error Code

  1. Faulty Return Thermistor: The thermistor itself may be malfunctioning, damaged, or providing incorrect temperature readings.
  2. Wiring Issues: Problems with the wiring or connections between the return thermistor and the boiler’s control board can lead to inaccurate temperature data being reported.
  3. Sludge or Scale Build-up: Accumulation around the thermistor can affect its ability to measure temperature accurately.
  4. Incorrect Installation or Placement: If the return thermistor is not correctly positioned within the heating system, it may not provide accurate temperature readings.

Troubleshooting and Resolving the Vokèra A41 Error Code

  1. Inspect the Return Thermistor: Check the return thermistor for any visible signs of damage or wear. It may need cleaning or replacing if found to be faulty.
  2. Verify Wiring and Connections: Ensure that the wiring and connections between the return thermistor and the boiler’s control unit are secure and in good condition. Repair or replace any damaged components.
  3. Clean Around the Thermistor: If there’s evidence of sludge or scale buildup around the thermistor, it might require cleaning. In severe cases, a system flush by a professional might be necessary.
  4. Check Thermistor Placement: Ensure that the return thermistor is correctly installed according to the manufacturer’s guidelines. Adjust the placement if necessary, ideally with professional assistance.
  5. Reset the Boiler: After addressing potential issues, try resetting the boiler to see if the error code clears and if normal operation resumes.
  6. Seek Professional Help: If the A41 error persists or you’re unsure how to proceed, it’s advisable to contact a Gas Safe registered engineer. A professional can accurately diagnose and resolve issues related to the return thermistor or the heating system’s overall functionality.
  7. Regular Maintenance: To prevent future issues, including the A41 error, ensure your boiler and heating system undergo regular professional maintenance. This can help identify and resolve potential problems before they lead to significant faults.


The Vokèra A41 error code highlights a problem with the return thermistor, necessitating careful attention to ensure efficient and reliable boiler operation. While homeowners can perform some initial checks and cleaning, resolving complex issues related to thermistor functionality or heating system integrity often requires professional intervention. Regular maintenance is crucial for maintaining optimal system performance and preventing similar faults.