14
Troubleshooting
6 720 612 217 (05.03)
7.2 Faults not indicated on the display
Problem Cause Remedy
Display blank, solar heating
system pump not running even
though storage tank tempera-
ture is below solar panel tem-
perature.
No power supply, fuse blown
or power lead defective.
Have electrical system
checked by qualified
electrician.
Solar heating system pump
not running even though stor-
age tank temperature is below
solar panel temperature.
Solar heating system pump
switched off by mode selector
switch S.
Set mode selector switch
S to automatic mode.
Storage tank temperature
is close to or above the set
maximum storage tank temper-
ature, storage tank tempera-
ture limiter has switched off
solar heating system pump.
As soon as the storage
tank has cooled down or
sufficient water is drawn
off, the solar heating sys-
tem pump will switch on
again.
Solar panel temperature is
above 130°C, solar panel tem-
perature cut-out has switched
off solar heating system pump.
Solar heating system
pump is not switched on
again until solar panel
temperature has dropped
below 127 °C .
Table 6
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