Fault Finding Chart; Disposal - Grundfos LCD 108 Installations- Und Bedienungsanleitung

11. Fault finding chart

Warning
Before starting any work on pumps used to pump liquids which could be constituted as being hazardous to health,
thorough cleaning/venting of pumps, pits, etc. must be carried out according to local regulations.
Before making any connections in the LCD 108 or work on pumps, pits, etc., it must be ensured that the electricity
supply has been switched off and that it cannot be accidentally switched on.
Fault Cause
1. The pumps do not run. a) No electricity supply.
b) The ON-OFF-AUTO selector switch is in
c) Control circuit fuses are blown.
d) The motor protection relays have cut out the
e) The PTC resistance/thermal switch has cut
f)
g) Motor/supply cable is defective.
h) The float switches are defective.
i)
j)
2. The pumps are starting/ a) The float switches are defective.
stopping too frequently.
See also installation and operating instructions for the pump in question.

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.
26
Without battery back-up:
None of the indicator lights are on.
With battery back-up
(accessory for certain variants):
See section 4.4, 5.4, 6.4 or 7.4.
position OFF, see section 4.5, 5.5,
7.5.
pumps (the red indicator light for pump fault
is permanently on).
out the pump (the red indicator light for
pump fault is flashing).
The control circuit for the motor protection
relays has been broken or fails (the green
indicator light indicating pump operation is
permanently on, see section 4.3, 5.3,
7.3).
The CU 212 module is defective.
The new DIP switch setting does not work
correctly.
Subject to alterations.
Remedy
Switch on the electricity supply.
Push the ON-OFF-AUTO selector switch into position
6.5 or ON or AUTO.
Check and eliminate the cause. Replace the control
circuit fuses (see pos. 6 in fig.
Check the pump/pit.
Allow the pump to cool. After cooling, the pump will
restart automatically unless the LCD 108 has been set
to manual restarting, see section 4.2, 5.2,
If so, the ON-OFF-AUTO selector switch must be
pushed into position OFF for a short period.
If the pump cutout was caused by choked-up float
switches, these must be cleaned or replaced.
Check the control circuit.
6.3 or
Check motor and cable.
Check cables and float switches.
Replace the CU 212 module.
Switch off the electricity supply to the controller for
1 minute and switch it on again (normal procedure).
See section 4.2, 5.2,
Check cables and float switches.
1 or fig. 3).
6.2 or 7.2.
6.2 or 7.2.