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6.2 PM 2
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 5.2.1 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 5.2.1 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.
8. System without pressure
tank:
The red "Alarm" indicator light
flashes once per period.
a) Cycling.
A tap has not been closed entirely after use.
Check that all taps have been closed.
See the installation and operating
instructions for further information.
b) Cycling.
There is a minor leakage in the system.
Check the system for leakages.
See the installation and operating
instructions for further information.
9. System with pressure tank:
The red "Alarm" indicator light
flashes once per period.
a) Cycling.
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.
See the installation and operating
instructions for further information.
10. The red "Alarm" indicator light
flashes twice per period.
a) Maximum continuous operating time (30 minutes).
The pump has been running continuously for 30 minutes.
Check the system for leakages.
Disable the function to allow the pump to
run for 30 minutes.
See the installation and operating
instructions for further information.
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