118 — Pressure in hydraulic circuit too low (< 0.5 bar)

What does 118 mean?

The water pressure in the boiler's heating circuit has dropped too low, below 0.5 bar. This prevents the boiler from operating safely.

• System leak
• Insufficient water in the heating system
• Faulty hydraulic pressure switch

Click steps to track your progress.

1. 1

   Check that the pressure displayed on the pressure gauge is between 0.5 and 1.5 bar when the boiler is cold.

2. 2

   If the pressure is too low, turn tap 'A' to slowly fill the boiler until the correct pressure is reached (refer to the 'FILLING THE SYSTEM' section).

3. 3

   If frequent pressure drops occur, contact an Authorised Technical Service Centre to check for leaks or a faulty pressure switch.