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