Pumps & Water Systems

E01: Dry run protection activated

Grundfos CR-45

Safe preliminary checks permitted

Documented meaning

The pump detected no or insufficient liquid at the inlet.

Model variants covered: see the model record

Documented possible causes

· Suction supply closed or lost
· Inlet strainer blocked
· Air lock in the suction line

Safe preliminary checks

· Open the suction valve fully and confirm inlet pressure

Professional service required

· Open the suction valve fully and confirm inlet pressure
· Clean the visible strainer
· Vent the pump body and restart once
· safe_checks_permitted

Stop and call a professional if you see

· Burning smell, smoke, water on live parts or a tripped protective device
· Unusual noise, vibration or a refrigerant leak