S.41 — Water pressure too high (> 2.9 bar)

What does S.41 mean?

The heating system's water pressure is detected as being too high, exceeding 2.9 bar. High pressure can indicate an issue and may cause the boiler to block operation.

• System overfilled with water.
• Expansion vessel fault.
• Pressure sensor fault.

Click steps to track your progress.

1. 1

   Check the pressure gauge on your boiler. If it's too high, you may need to bleed some water from a radiator (consult a professional if unsure).

2. 2

   Ensure all filling loops are completely closed and not allowing water to continuously enter the system.

3. 3

   If the pressure frequently rises or remains high, contact a qualified service technician to check the expansion vessel or pressure sensor.