What does 431 mean?

The sensor monitoring the heat exchanger is not functioning correctly. This can lead to incorrect temperature readings and affect boiler performance.

• Faulty exchanger sensor
• Wiring issues to the sensor

Click steps to track your progress.

1. 1

   Press and hold down the Reset button for 2 seconds to try clearing the fault.

2. 2

   Wait at least 5 minutes before attempting another reset if the fault reappears.

3. 3

   If the fault persists, contact an Authorised Service Centre to check the sensor and its connections.