Cosmo Multi 2 - 5. Troubleshooting - Solar Circuit Pump Failure; Solar Circuit Pump Inaction; Pump Stuck or Defective

The solar circuit pump does not work, although the
collector is considerably warmer than the store.
Is the control lamp
(LED) illuminated?
yes no
Does the pump start up
in manual operation?
yes
There is no current;
check fuses / replace
them and check power
supply.
The adjusted tempe-
rature difference for
starting the pump is
to high; choose a va-
lue which makes more
sense.
no
Is the pump current
enabled by the control-
ler?
yes
Is the pump stuck?
Turn the pump shaft
using a screwdriver;
now passable?
Pump is defective - re-
place it
Are the controller fuses
o.k. ?
Controller might be de-
fective - replace it.
no
yes
no
no yes
Replace fuses..
5. Troubleshooting
118