21
0.1
1
10
100
0
20
40
60
80
100
120
140
Temperature in °C
Resistance
in kΩ
A
B
25
Fig. 3
A
Collector temperature sensor
&
(TS2, sensor
type: NTC 20 k
Ω
)
B
■
Cylinder temperature sensor
%
(TS1)
■
Temperature sensor
/
(TS3)
■
Temperature sensor
aÖ
(TS4)
(sensor type: NTC 10 k
Ω
)
Incorrect circulation in the solar circuit
If code/parameter "0D:1" has been set (delivered con-
dition), unwanted DHW circulation (e.g. at night) is
captured. In
"Diagnosis solar"
(weather-compensa-
ted control unit) or
"Brief scan"
(constant temperature
control unit), the number of instances where incorrect
circulation was captured can be scanned.
■
Check time shown at the control unit; adjust if neces-
sary.
■
Check current collector temperature and cylinder
temperature via diagnosis.
If the collector temperature is too low and the cylin-
der temperature too high, then the sensors have
been interchanged.
■
Switch off all actuators via a relay/actuator test.
If the solar circuit pump continues to run, see "Check
solar circuit pump at output
sF
".
If the flow and return temperature rises when the
solar circuit pump is switched off, there may be re-
circulation via gravity.
Check any installed check valves or install them if
necessary.
Troubleshooting
Repairs
(cont.)
6131981
Diagnosis
