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Operating control lamp is permanently off.
Check the power supply of the controller. Is it
disconnected?
no
The fuse of the
Check the supply line
controller could be
and reconnect it.
blown. The fuse hol-
der (which holds the
spare fuse) becomes
accessible when the
cover is removed.
The fuse can then be
replaced.
5.1
Miscellaneous
Pump is overheated, but no heat transfer from
the collector to the store, flow and return have
the same temperature; perhaps also bubbling in
the lines.
Air or gas bubbles in
Vent the system;
the system?
increase the system
pressure to a static
no
yes
primary pressure of
at least plus 0,5 bar;
Is the collector
if necessary continue
circuit blocked at the
to increase pressure;
dirt trap?
switch the pump off
yes
and on for a short
time.
Clean dirt trap
Pump starts for a short moment, switches off,
switches on again, etc.
Temperature
difference at the cont-
yes
roller too small?
no
Wrong position of
collector sensor?
no
Plausibility control
of the option tube
collector function
Pump starts up very late.
Switch-on tempera-
ture difference ∆Ton
too large?
no
Non-ideal position of
the collector sensor
(e.g. flatscrew sensor
instead of sensor in
immersion sleeves).
Change ∆Ton and
yes
∆Toff correspondingly.
no
o.k.
Mount the collector
yes
sensor at solar flow
(warmest collector
output); use immer-
sion sleeve of the
respective collector.
yes
Change ∆Ton and
∆Toff correspondingly.
yes
Activate tube
collector function if
necessary
o.k.
The temperature difference between store and
collector increases enormously during operation;
the collector circuit cannot dissipate the heat.
Collector circuit
pump defective?
no
yes
Check / replace it
Heat exchanger
calcified?
no
yes
Decalcify it
Heat exchanger
blocked?
no
yes
Clean it
Heat exchanger too
small?
yes
Replace with correct-
ly sized one.
33
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