E15 — Anti-freeze Abnormality

What does E15 mean?

This error indicates that the system has detected conditions leading to anti-freeze protection activation, such as very low water temperatures in cooling mode.

• Water temperature in the Hydro Unit (Twi or Two) falling to 3°C or below during cooling.
• Insufficient water circulation or flow through the unit.
• Extremely low ambient temperatures affecting the system.

Click steps to track your progress.

1. 1

   Ensure that the water circulation pump is operating correctly and there are no closed valves.

2. 2

   Check for any blockages in the water pipes that could restrict flow.

3. 3

   Allow the unit to recover for 10 minutes; it may clear automatically. If the error occurs 3 times in an hour, contact a qualified service technician.