AXEON Grundfos MQ-Series - Manual (Page 19)

19
English (US)
14. Fault finding chart
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/+35 °C).
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 volt-
age.
Check the supply voltage and cor-
rect 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 dis-
charge pipe and the pump does not
exceed 50 ft.
g) Shaft is blocked. Rotate the shaft as described in 10.2
h) Pump is in alarm condition. Reset the pump by means of the on/
off button. See point 2 in the table of
section 9.1 Control panel.
2. The pump does
not stop. a) Existing pipework is leaking or
defective.
Repair the pipework.
b) Non-return valve is blocked or
missing.
Clean the valve or fit a new non-
return 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/+35 °C).
Supply cold liquid to the pump.
c) Overheating caused by:
– high ambient temperature
(> 113 °F/45 °C)
– overloaded motor
– seized-up motor/pump.
Contact your pump supplier.
d) Too low supply voltage. Check the supply voltage and cor-
rect the fault, if possible.
4. The pump
starts and
stops too fre-
quently.
a) Leakage in suction pipe or air
in water.
Check the water and the supply/suc-
tion pipe.
b) Too low or too high pressure in
pressure tank.
Check the pressure in the pressure
tank. See section 6. Operating con-
ditions.
5. The pump
gives electric
shocks.
a) Defective ground connection. Connect the ground connection to
the pump in accordance with local
regulations.
Grundfos.book Page 19 Monday, May 23, 2011 10:17 AM