E18 — Water refill active

What does E18 mean?

This message indicates that the automatic water refill function is currently active. This is a status message, not a fault, and means the boiler is topping up its water levels.

• Normal operation, boiler is automatically refilling the system.
• Potentially frequent refilling could indicate a small leak in the system.

Click steps to track your progress.

1. 1

   Observe the boiler's display; this message should clear once the refill is complete.

2. 2

   Check the system pressure gauge periodically to ensure it stabilizes after refilling.

3. 3

   If this message appears very frequently, or if the system pressure drops often, check for visible water leaks in your heating system.