What To Do If; The Solar Thermal System Does Not Start; There Is No Dhw Available - Viessmann VITOSOLIC 200 Operating Instructions For The System User

The solar thermal system does not start

Cause
The ON/OFF switch is switched off.
The solar control unit MCB has respon-
ded (mains voltage is present, display is
not illuminated).
Collector limit temperature or set cylinder
temperature has been reached.
The solar control unit is in "Manual
mode".

There is no DHW available

Cause
The solar control unit is faulty.
Collector temperature is too high; safety
shutdown by the solar control unit.
The set cylinder temperature (set DHW
temperature) has been set too low.
The solar circuit pump is faulty.
The DHW cylinder is not being reheated:
The operating and time program is incor-
rectly set at the boiler control unit.
Remedy
Switch the ON/OFF switch ON.
Inform your local heating contractor.
Wait until the relevant temperature has
fallen below its respective limit.
Select "Auto" as follows:
1. Press .
2. Press until "Manual mode" is dis-
played.
3. Press OK to confirm.
4. Press until "Relay 1" etc. is dis-
played.
5. Press OK to confirm.
6. Press the /
7. Press OK to confirm.
8. Press until "Main menu" is dis-
played.
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

What to do if...

keys for "Auto".
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