English (GB)
7
7. Fault finding
Warning
Before starting work on the pump, make
sure that the power supply has been
switched off and that it cannot be
accidentally switched on.
Fault
Cause
Remedy
1.
The green light field
for "0 bar" is off even
if the power supply
has been switched
on.
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.
c)
No power supply.
Contact the power supply company.
d)
The PM unit is defective.
Repair or replace the PM unit.
2.
The green "Pump
on" indicator light is
on, but the pump
does not start.
a)
The power supply to the pump is
disconnected after the PM unit.
Check the plug and cable connections,
and check if the built-in circuit breaker of
the pump is switched off.
b)
The motor protection of the pump
has tripped due to overload.
Check if the motor/pump is blocked.
c)
The pump is defective.
Repair or replace the pump.
d)
The PM unit is defective.
Repair or replace the PM unit.
3.
The pump does not
start when water is
consumed.
The "Pump on"
indicator light is off.
a)
Too big difference in height
between the PM unit and the
tapping point.
Adjust the installation, or increase the
start pressure.
See the quick guide.
b)
The PM unit is defective.
Repair or replace the PM unit.
4.
System without
pressure tank:
Frequent
starts/stops.
a)
DIP switch 5 set to "ON".
Set DIP switch 5 to "OFF". See the quick
guide.
b)
Leakage in the pipework.
Check and repair the pipework.
c)
The non-return valve is stuck in
open position.
Clean or replace the non-return valve.
5.
System with
pressure tank:
Frequent
starts/stops.
a)
The pressure tank has no
precharge pressure, or the tank
size is insufficient.
Check the tank precharge pressure, and
recharge the tank, if necessary.
If the size of the pressure tank is
insufficient, set DIP switch 5 to "OFF",
or replace the pressure tank.
b)
Leaky non-return valve.
Clean or replace the non-return valve.
6.
The pump does not
stop.
a)
The pump cannot deliver the
necessary discharge pressure.
Replace the pump.
b)
The start pressure is set too high.
Decrease the start pressure.
c)
The PM unit is defective.
Repair or replace the PM unit.
d)
The non-return valve is stuck in
open position.
Clean or replace the non-return valve.
7.
The red "Alarm"
indicator light is
permanently on.
a)
Dry running. The pump needs
water.
Check the pipework.
b)
The power supply to the pump is
disconnected after the PM unit.
Check the plug and cable connections,
and check if the built-in circuit breaker of
the pump is switched off.
c)
The motor protection of the pump
has tripped due to overload.
Check if the motor/pump is blocked.
d)
The pump is defective.
Repair or replace the pump.
e)
The PM unit is defective.
Repair or replace the PM unit.
Summary of Contents for CMB-SP Booster PM2
Page 1: ...CMB CMB SP Booster PM2 Supplement to Quick Guide GRUNDFOS INSTRUCTIONS ...
Page 2: ...2 ...
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