Stores cool down at night
Collector circuit pump
runs in the night?
no yes
Check controller
Collector temperature is
at night higher than the
outdoor temperature
no yes
Check the non-return
valve in the flow and
the return pipe with re-
gard to the functional
efficiency.
Sufficient store insula-
tion?
yes no
Increase insulation.
Insulation close enough
to the store?
yes no
Replace insulation or
increase it.
Are the store connec-
tions insulated?
yes no
Insulate the
connections.
Warm water outflow
upwards?
no yes
Change connection and
let the water flow side-
wards or through a si-
phon (downwards); less
store losses now ?
Does the warm water
circulation run for a
very long time?
no yes
Use the circulation
pump with timer and
switch-off thermostat
(energy efficient circu-
lation).
Circulation pump and
blocking valve should be
switched off for 1 night;
less store losses?
yes no
Check whether the
pumps of the after-he-
ating circuit run at night;
check whether the non-
return valve is defective;
problem solved?
no
no yes
o.k.
Control the non-return
valve in warm water cir-
culation - o.k.
yes no
Further pumps which
are connected to the
solar store must also be
checked.
The gravitation circula-
tion in the circulation
line is to strong; insert
a stronger valve in the
non-return valve or an
electrical 2-port valve
behind the circulation
pump; the 2-port valve
is open when the pump
is activated, otherwise it
Clean or replace it
is closed;
connect pump and
2-port valve electrically
in parallel; activate the
circulation again
a
a
5. Troubleshooting
117
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