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Pump is overheated, but no heat transfer from the colle-
ctor to the tank, flow and return have the same tempe-
rature; perhaps also bubble in the lines
Air in the system?
no
yes
Is the collector circuit
blocked at the dirt trap?
yes
Pump starts up very late..
Switch-on-temperature
difference ∆T
too
on
large?
no
yes
Non-ideal position of coll-
ector sensor (e.g. flatscrew
sensor instead of sensor in
immersion sleeves?)
yes
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Vent the system; in crease
system pressure to at
least static primary pres-
sure plus 0,5 bar; if neces-
sary increase the pressure,
switch the pump on and
off for a short time
Clean the dirt trap
and ∆Toff
Change ∆T
on
correspondingly
Activate tube collector
function if necessary.
o.k.
Pump starts for a short moment, switches-on/off
again,etc.
Is the temperature diffe-
rence at the controller
too small?
no
yes
Wrong position of the
collector sensor?
no
yes
Plausibility control of the
tube collector function
The temperature difference between the tank and the coll-
ector increases enormously during operation; the collector
circuit cannot divert the heat.
Collector circuit pump
defective ?
no
yes
Heat exchanger calcified?
no
yes
Heat exchanger blocked?
no
yes
Heat exchanger too
small?
yes
and ∆T
Change ∆T
on
off
correspondingly
.
no
o.k.
Mount the collector sen-
sor at solar flow (warmest
collector output); use the
immersion sleeve of the
respective collector.
Check / replace it
Decalify it
Clean it
Repalce with correctly
sized one