Error E118 - Primary System Water Pressure Too Low

What does 118 mean?

The central heating system pressure is too low, indicated by the gauge reading below 1 bar or the E118 error code on the display. The boiler will not operate correctly until the pressure is restored.

• Minor leaks in the heating system
• Normal pressure loss over time
• Insufficient water added during initial system filling

Click steps to track your progress.

1. 1

   Locate the filling loop, which consists of two taps and a separate copper pipe.

2. 2

   Connect the copper pipe between the two taps and tighten the nuts securely.

3. 3

   Fully open one tap, then carefully open the second tap while watching the pressure gauge (or press 'R' 6 times to view on display).

4. 4

   When the gauge reads between 1 and 1.5 bar, turn both taps off completely and disconnect the copper pipe.

5. 5

   If the pressure drops again frequently after repressurising, contact your installer for inspection.