The Solar Thermal System Does Not Start - Viessmann VITOSOLIC 100 Operating Instructions For The System User

What to do if...

The solar thermal system does not start

Cause
The solar control unit MCB has responded.
Power failure
The power distribution MCB (main domestic MCB) has
responded.
The collector limit temperature or maximum cylinder
temperature has been reached.
The solar control unit is in manual mode.
The display shows " " and "
Æ
There is no DHW available
Cause
The solar control unit is faulty.
The collector temperature is too high, safety shutdown
by the solar control unit.
The set cylinder temperature (set DHW temperature) is
set too low.
The solar circuit pump is faulty.
The DHW cylinder is not being reheated:
The operating and time programs on the boiler control
unit are incorrectly set.
The display is flashing
Cause
Example, sensor fault
KOL
The sensor symbol in the system scheme flashes
quickly.
flashes.
¨
6
" flashes.
¨
°C
Remedy
Inform your local heating contractor.
The solar control unit automatically returns to operation
once the power supply has been restored.
Check the MCB and inform your heating contractor if
necessary.
Wait until the relevant temperature has fallen below its
respective limit.
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.
Remedy
Inform your local heating contractor.
Wait until the collector temperature has dropped.
Inform your local heating contractor.
Inform your local heating contractor.
Enable DHW heating.
Operating instructions of the boiler control unit
Remedy
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 / .