Pump starts for a short moment, switches off, switches on again, etc.
Temperature difference at the con-
troller too small?
no yes
Wrong position of collector
sensors?
yes
Change ∆Ton and ∆Toff corre-
spondingly.
Mount the collector sensor at
solar flow (warmest collector out-
put); use immersion sleeve of the
respective collector.
no
Plausibility control of the option
tube collector function
o.k.no
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.
Vent the system; increase the
system pressure to a static primary
pressure of at least plus 0.5 bar
[7.25 psi]; if necessary continue to
increase the pressure; switch the
pump on and off for a short time.
Air or gas bubbles in the system?
no yes
Are the valves or the non-return
valves defective or is the dirt trap
blocked?
yes
Clean the dirt trap or replace
defective component
Pump starts up very late.
The temperature difference between store and collector increases enormously
during operation; the collector circuit cannot dissipate the heat.
Collector circuit pump / zone valve
defective?
no
Heat exchanger calcified?
Check or replace, if necessary
Decalcify it
no
Heat exchanger blocked?
no
Clean it
Heat exchanger too small?
Replace with correctly sized one.
Change ∆Ton and ∆Toff corre-
spondingly.
Switch-on temperature difference
∆Ton too large?
no yes
Non-ideal position of the collector
sensor (e. g. flatscrew sensor instead
of sensor in immersion sleeves).
Put the solar pump (R1) into the
manual mode On for a short time
during irradiation. Check whether
the collector temperature signifi-
cantly increases.
yes
yes
yes
yes
yes
o.k.
no
Minimum limitation active
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