The Solar Thermal System Does Not Start; There Is No Dhw Available - 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 respon-
ded.
Power failure
The power distribution MCB (main do-
mestic MCB) has responded.
The collector limit temperature or maxi-
mum cylinder temperature has been
reached.
The solar control unit is in manual mode.
The display shows "Æ" and "¨" flash-
es.

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.
8
Remedy
Inform your local heating contractor.
The solar control unit automatically re-
turns 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