12
10. Fault finding chart
If the pump does not start when the fault has been corrected, contact your pump supplier or Grundfos for further
information.
Fault Cause Remedy
1. The pump does
not start.
a) Insufficient water. Check the water supply/suction pipe.
b) Overheating due to excessive liquid
temperature (above +95°F).
Supply cold liquid to the pump.
c) Overheating due to seized-up/
choked-up pump.
Contact your pump supplier.
d) Too low or too high supply voltage. Check the supply voltage and correct the
fault, if possible.
e) No electricity supply. Connect the electricity supply.
f) No water consumption. Open a tap. Check that the height between
the top point of the discharge pipe and the
pump does not exceed 50 ft.
g) The pump is in alarm condition. Reset the pump by means of the on/off
button. See point 2 in the table in section
4.1 Control panel.
2. The pump does
not stop.
a) The existing pipework is leaking or
defective.
Repair the pipework.
b) The check valve is blocked or missing. Clean the valve or fit a new check valve.
3. The pump cuts out
during operation.
a) Dry running. Check the water supply/suction pipe.
b) Overheating due to excessive liquid
temperature (above +95°F).
Supply cold liquid to the pump.
c) Overheating caused by:
- high ambient temperature (> 113°F),
- overloaded motor or
- seized-up motor/pump.
Contact your pump supplier.
d) Too low supply voltage. Check the supply voltage and correct the
fault, if possible.
4. The pump starts
and stops too fre-
quently.
a) Leakage in suction pipe or air in the
water.
Check the water supply/suction pipe.
b) Too low or too high pressure in pres-
sure tank.
Check pressure in pressure tank, see sec-
tion 3.1 Operating conditions.
5. The pump gives
electric shocks.
a) Defective ground connection. Connect the ground connection to the
pump in accordance with local regulations.
6. The pump starts
when no water is
consumed.
a) Defective check valve or the existing
pipework is leaking or defective.
Clean the valve or fit a new check valve.
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