Grundfos CH 12, Installation And Operating Instructions Manual

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6. Fault finding chart
7. Disposal
Disposal of this product or parts of it must be carried
out according to the following guidelines:
1. Use the local public or private waste collection
service.
2. In case such waste collection service does not
exist or cannot handle the materials used in the
product, please deliver the product or any haz-
ardous materials from it to your nearest Grundfos
company or service workshop.
Before attempting to diagnose any fault, make sure that the electricity supply has been switched off.
Fault Cause
1. Pump does not start. a) Supply failure.
b) Control circuit has cut out or is defective.
c) Motor is defective.
d) Pump is blocked by impurities.
2. Pump runs but gives no water. a) Pump is not filled with liquid.
b) Suction or discharge pipe is blocked by impurities.
c) Pump is blocked by impurities.
d) Suction lift is too great.
e) Leakage in suction pipe.
f) Foot or non-return valve is blocked.
3. Pump runs at reduced
capacity.
a) Wrong direction of rotation (three-phase).
b) Suction lift is too great.
c) Suction or discharge pipe is blocked.
d) Pump is blocked by impurities.
e) Foot or non-return valve is partly blocked.
4. Pump stops during operation. a) Thermal overload switch in motor or external motor protection cuts
out.
b) Control circuit has cut out.
Subject to alterations..