English (GB)
26
3. The pump(s) is/are
starting/stopping too
frequently and even if
there is no inflow.
a) The level sensor fails. The sensor gives
wrong signal.
Clean the level sensor
(see section
10.3 Cleaning the level sensor
).
b) The operating time protection is activated,
the pump and time symbols are flashing, the
red LED is flashing and the display indicates
fault code F011 and/or F012. If the pump
runs longer than 3 minutes, a protection
program of the controller will stop the pump
for 3 minutes and the other pump will take
over. At the next start impulse, the first
pump will be activated again. If the venting
problem persists, the pump will be stopped
after 3 minutes and so on.
Note:
Normal operating times are max. 90
seconds with pipework DN 32 and 60
seconds with pipework DN 40.
Check that the outlet valve is open. Check the venting of
the pump housing. If blocked clean the vent hole.
c) The thermal switch has cut out the pump.
The pump and thermal switch symbols on
the display are flashing, and the red
indicator light for fault is permanently on.
The fault indication in the display is TEMP
and in the fault code is F005 and/or F006.
Allow the pump to cool. After cooling, the pump will
restart automatically unless the LC 221 has been set to
manual restarting. See section
. If
so, the ON-OFF-AUTO selector switch must be pushed
into position OFF ( ) for a short period.
Check the inflow parameters and the non-return valve.
The risk is low, but if the non-return valve flap is leaky,
liquid in the outlet pipe can flow back.
A high number of starts without cooling time in between
over a longer period can cause thermal cut-out.
Consider S3 duty. See section
.
See also section
10.3 Cleaning the level sensor
.
4. One pump starts
sometimes without
visible reason.
a) Test run 24 hours after last operation.
No action necessary. It is a safety function that prevents
the shaft sealing from seizing up.
