Grundfos Multilift MOG Manual Del Usuario página 28

3. The pump(s) is/are a) The level sensor fails. The sensor gives
starting/stopping too
frequently and even if
b) The operating time protection is activated,
there is no inflow.
c) The thermal switch has cut out the pump.
4. One pump starts a) Test run 24 hours after last operation.
sometimes without
visible reason.
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wrong signal.
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.
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.
Clean the level sensor
(see section 10.3 Cleaning the level
Check that the outlet valve is open. Check the venting of
the pump housing. If blocked clean the vent hole.
Allow the pump to cool. After cooling, the pump will
restart automatically unless the LC 221 has been set to
manual restarting. See section
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
No action necessary. It is a safety function that prevents
the shaft sealing from seizing up.
sensor).
8.4 Setting of LC 221. If
12. Technical data.
sensor.