E431/167 — Aluminium sensor fault

• Faulty aluminium sensor.
• Loose or damaged wiring to the sensor.

Click steps to track your progress.

1. 1

   Turn off the main power supply to the boiler, wait 30 seconds, then turn it back on.

2. 2

   Check if the error code clears.

3. 3

   If the error persists, a qualified technician should check the aluminium sensor and its wiring.