STIEBEL ELTRON SOM 10 - Manual (Page 78)

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Display illuminated?
If not, press button 5 . Display illumina-
ted now?
Is the pump current enabled by
the controller?
Does the pump start up in
manual operation?
The solar circuit pump does not work, although the collector is considerably
warmer than the store.
yes no
yes
There is no current; check
fuses / replace them and check
power supply.
The adjusted temperature dif-
ference for starting the pump is
too high; choose a value which
makes more sense.
no
yes
Is the pump stuck?
Turn the pump shaft using a
screwdriver; now passable?
no
yes
Stores cool down at night.
Collector circuit pump runs
during the night?
no yes
Check controller
Check the non-return valves in
the flow and the return pipe for
functional efficiency.
Sufficient store insulation?
yes no
Increase insulation.
Insulation close enough to the
store?
yes no
Replace insulation or increase it.
Are the store connections
insulated?
yes no
Insulate the connections.
Warm water outflow upwards?
no yes
Change connection and let the
water flow sidewards or through
a siphon (downwards); less store
losses now?
no yes
o.k.
a
Collector temperature at night
is higher than the outdoor
temperature.
no yes
no
Controller might be defective
- replace it.