E127 — Antilegionella temperature not reached

What does E127 mean?

The boiler has failed to reach the required temperature for the Antilegionella function, which purifies the domestic hot water tank.

• Issue with the DHW (Domestic Hot Water) NTC sensor.
• Problem with the tank system heating.
• Insufficient heat transfer to the tank.

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

   Ensure the domestic hot water temperature setting is appropriate.

3. 3

   A qualified technician should check the DHW NTC sensor and the overall tank heating system.