S.41 — Water pressure too high (> 2.8 bar)

What does S.41 mean?

The boiler's internal water pressure has exceeded the safe limit of 2.8 bar. High pressure can indicate an issue within the heating system.

• System has been overfilled with water.
• Expansion vessel may be faulty or requires recharging.
• Filling loop may be incorrectly closed or leaking.

Click steps to track your progress.

1. 1

   Locate the filling loop and ensure it is fully closed and not allowing water into the system.

2. 2

   If safe to do so, carefully drain a small amount of water from a radiator bleed valve to reduce pressure (ensure boiler is off and cold).

3. 3

   If the high pressure persists or reoccurs frequently, contact a qualified heating engineer.