E4: dry-run

What does E4 mean?

The pump is operating without sufficient liquid, meaning it is trying to pump air instead of water. Running dry can cause significant damage to the pump over time.

• Air trapped within the system or the pump itself.
• Valves in the system are closed, preventing water flow to the pump.
• Insufficient water level or pressure in the heating/cooling system.
• A leak in the system causing the water level to drop.

Click steps to track your progress.

1. 1

   Immediately turn off the pump's power to prevent potential damage from running dry.

2. 2

   Check all valves in the system to ensure they are fully open and allowing water to flow to the pump.

3. 3

   Bleed the system and the pump itself to remove any trapped air. Refer to your system manual for specific bleeding procedures.

4. 4

   Ensure there is adequate water pressure and that the system is properly filled.

5. 5

   Once the system is full and bled, restore power and restart the pump.