E117 — Water pressure too high

What does E117 mean?

The boiler has detected that the primary heating circuit water pressure is too high, exceeding 2.7 or 2.9 bar.

• Overfilling the heating system.
• Faulty expansion vessel.
• Faulty pressure sensor.

Click steps to track your progress.

1. 1

   Check the system water pressure on the boiler's gauge.

2. 2

   If the pressure is too high, you may need to bleed water from a radiator to reduce it to the recommended range (typically 1-1.5 bar).

3. 3

   If the pressure frequently rises, a qualified technician should check the expansion vessel and safety relief valve.