15
12. Fault finding chart
Warning
Before starting work on the pump/PM unit, 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 blown.
Replace the fuses. If the new fuses also blow,
check the electric installation.
b) The earth leakage circuit breaker
or the voltage-operated circuit
breaker has been tripped out.
Cut in the circuit breaker.
c) No power supply. Contact the power supply authorities.
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 out 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.
"Pump on" 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 section 5.1 DIP switches.
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 section 5.1 DIP switches.
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 out 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.*
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