English (GB)
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11. Fault finding
* Or contact the nearest Grundfos company or
service workshop.
12. 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.
Subject to alterations.
Warning
Before starting fault finding, switch off
the power supply. Make sure that the
power supply cannot be accidentally
switched on.
Fault
Cause
Remedy
1.
The pump does
not start.
a)
The fuses in the electric
installation have burnt.
Replace the fuses. If the new fuses also burn,
check the electric installation.
b)
The earth leakage circuit
breaker or the
voltage-operated circuit
breaker has tripped.
Cut in the circuit breaker and check the electric
installation.
2.
There is power on
the pressure
switch but not the
pump.
a)
The power supply to the pump
is disconnected after the
pressure switch unit.
Check the cable connections.
b)
The pressure switch unit is
defective.
Repair or replace the pressure switch unit. *
3.
The pump does
not start when
water is
consumed.
a)
Too big difference in height
between the pressure switch
unit and the tapping point.
Adjust the cut-in pressure.
b)
The pressure switch unit is
defective.
Repair or replace the pressure switch unit. *
4.
Frequent
starts/stops.
a)
Leakage in the pipework.
Check and repair the pipework.
b)
The pressure tank has no
precharge pressure, or the
tank size is insufficient.
Check the tank precharge pressure, and
recharge the tank, if necessary. See section
5.
The pump does
not stop.
a)
The pressure switch unit is
defective.
Repair or replace the pressure switch unit. *
6.
The motor cuts
out during
operation.
a)
The thermal switch in the
motor has tripped due to
overheating.
The thermal switch will cut in automatically
when the motor has cooled sufficiently.
If the problem still persists, check these two
possible causes:
• Impeller stuck.
Clean the pump.
• Motor defective.
Repair or replace the motor. *
