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Cause Remedy
The solar control unit MCB has responded. Inform your local heating contractor.
Power failure The solar control unit automatically returns to operation
once the power supply has been restored.
The power distribution MCB (main domestic MCB) has
responded.
Check the MCB and inform your heating contractor if
necessary.
The collector limit temperature or maximum cylinder
temperature has been reached.
Wait until the relevant temperature has fallen below its
respective limit.
The solar control unit is in manual mode.
The display shows "Æ" and "¨" flashes.
Select "Auto":
1. Press until "ANL" is displayed.
2. Press until "HND 1" or "HND 2" is displayed.
3. Press OK, "SET" flashes.
4. Press until "Auto" is displayed.
5. Press OK to confirm.
6. Press . The collector temperature is displayed.
There is no DHW available
Cause Remedy
The solar control unit is faulty. Inform your local heating contractor.
The collector temperature is too high, safety shutdown
by the solar control unit.
Wait until the collector temperature has dropped.
The set cylinder temperature (set DHW temperature) is
set too low.
Inform your local heating contractor.
The solar circuit pump is faulty. Inform your local heating contractor.
The DHW cylinder is not being reheated:
The operating and time programs on the boiler control
unit are incorrectly set.
Enable DHW heating.
Operating instructions of the boiler control unit
The display is flashing
Cause Remedy
Example, sensor fault
KOL
°C
The sensor symbol in the system scheme flashes
quickly.
¨ flashes.
Read off the fault code. Inform your local heating con-
tractor.
In the example, the collector temperature sensor has a
short circuit.
88.8 Sensor short circuit
888.8 Sensor lead break
Note
Check other sensors with / .
What to do if...
The solar thermal system does not start
5592640
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