Error E117 - Primary System Water Pressure Too High

What does 117 mean?

The boiler has detected that the primary system water pressure has exceeded 3 bar, which has caused the safety pressure valve to activate. This prevents damage to the heating system.

• System has been overfilled with water
• A fault with the expansion vessel
• Problem with the filling loop valve not fully closing

Click steps to track your progress.

1. 1

   Check the system pressure gauge on the boiler; normal operating pressure is between 1 and 2.5 bar.

2. 2

   Ensure the filling loop taps are fully closed and the copper pipe has been disconnected.

3. 3

   Contact your installer or the Baxi service division ('heateam') as this typically requires professional intervention.