Controls Locked Out" Is Displayed - Viessmann Vitotronic 200 Series Operating Instructions For The System User

There is no hot water
Cause
Vitoair draught stabiliser faulty.
"Fault" is displayed, and the red fault indicator flashes.
The DHW is too hot
Cause
The control unit is incorrectly adjusted.
DHW heating is carried out by the solar thermal sys-
tem.
flashes and "Fault" is displayed
ã
Cause
Heating system fault.
flashes and "Service" is displayed
ë
Cause
The time for a service, as specified by your heating
contractor, has arrived.

"Controls locked out" is displayed

Cause
Control was blocked by your heating contractor.
"External hook-up" is displayed
Cause
The operating program set at the control unit was
changed by an external device, e.g. extension EA1.
(cont.)
Remedy
Contact your local heating contractor.
Press the rotary selector on the motor and turn it past
position as far as it will go.
A
A
Call up and acknowledge the type of fault (see
page 35).
Remedy
Check the DHW temperature and correct it if required
(see page 28).
Check and correct settings, if required, at the solar con-
trol unit.
Separate operating instructions
Remedy
Proceed as described on page 35.
Remedy
Proceed as described on page 33.
Remedy
Your heating contractor can lift this block.
Remedy
No remedy is required.
What to do if...
39