User Guide

14
10. Troubleshooting
11. Disposal
This product or parts of it must be
disposed of in an environmentally
sound way:
1. Use the public or private waste
collection service.
2. If this is not possible, contact
the nearest Grundfos company
or service workshop.
Problem Check for:
Noisy valve
Excessive flow velocity
Air in liquid
Liquid over 240 °F (115 °C)
Check proper flow direction
Valve does not open
Check voltage
Check wiring
Valves does not close
or seal off
Check voltage
ΔP too high
Debris in valve chamber
Damaged paddle
No demand for heat
Check that valve is open
Check continuity of end switch when valve is open
Subject to alterations.
Grundfos.bk Page 14 Wednesday, June 2, 2010 1:16 PM