English (GB)
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11. Fault finding
Warning
Before carrying out any work on lifting stations used
for pumping liquids which might be hazardous to
health, make sure that the lifting station has been
thoroughly flushed with clean water and that the
outlet pipe has been drained. Rinse the parts in
water after dismantling. Make sure that the isolating
valves have been closed.
The work must be carried out in accordance with
local regulations.
Before making any connections in the LC 221 or
work on lifting stations, etc., it must be ensured that
the power supply has been switched off and that it
cannot be accidentally switched on.
Fault
Cause
Remedy
1. The pump(s) does/do
not run.
a) No power supply.
None of the indicator lights are on.
With battery backup:
Switch on the power supply or wait until the power cut is
over. During the power cut, drain the collecting tank with
diaphragm pump.
b) The ON-OFF-AUTO selector switch is in
position OFF ( ), see section
Push the ON-OFF-AUTO selector switch into position
ON ( ) or AUTO ( ).
c) Control circuit fuses are blown.
Check and eliminate the cause. Replace the control
circuit fuses.
d) The motor-protective circuit breaker has cut
out the pump (only relevant if a
motor-protective circuit breaker has been
installed). The pump symbol in the display is
flashing and the red indicator light for fault is
flashing. The fault indication in the display is
RELAY and the fault code is F018.
Check the pump and tank as well as the setting of the
motor-protective circuit breaker. If the pump is blocked,
remove the blockage. If the setting of the
motor-protective circuit breaker is wrong, readjust it
(compare the setting with the nameplate).
e) Motor/supply cable is defective or the
connections have become loose.
Check motor and supply cable. Replace cable or
retighten connections if necessary.
f)
The fault indication in the display is
SENSOR and in the fault code is F005
and/or F006.
Clean the level sensor (see section
), and start up again. Check the cable and
the connection on the controller board. If the signal is
still wrong, please call Grundfos service.
g) The module power circuit board or the LCD
board is defective.
Replace the PCB or LCD board.
2. The sensor signal is out
of range.
All pumps are started
and high level alarm is
on.
a) Not all outlet valves are open.
Open all outlet isolating valves.
b) There is a blockage in the tank or pump.
Remove the blockage.
c) The pump is not vented correctly. The pump
cannot build up pressure.
1. Check that the vent hose is correctly fitted between
the vent flange and the tank.
2. Remove any blockage from the vent hole at the
outlet port.
d) The lifting station is undersized.
Recalculate the inflow parameters and compare the
result with the tank volume and pump performance. If
you need a new product, contact the nearest Grundfos
sales company.
