E8 — Minimum pressure switch has triggered

What does E8 mean?

The minimum pressure switch has activated, indicating that the heating system's water pressure has dropped below the safe operating threshold, typically 0.5 bar. The boiler will likely stop operating.

• The heating system pressure is too low, below 0.5 bar.
• A leak in the heating system causing pressure loss.
• The minimum pressure switch itself is defective.

Click steps to track your progress.

1. 1

   Check the heating system pressure gauge; if it is below 0.5 bar, the system needs to be refilled.

2. 2

   Fill the heating system with water until the pressure is within the recommended operating range (e.g., between 1 and 1.5 bar).

3. 3

   If the pressure is sufficient but the error persists, the minimum pressure switch may be defective and needs replacement by a professional.