Viessmann VITOTRONIC 200 Service Instructions Manual page 68

Troubleshooting
Messages
(cont.)
Message
Code/system characteris-
tics
FF New start
Information display, no
function restriction.
Note
If connection F11 on the controller and sensor PCB is occupied, the display "Simu-
lation" appears. The system is not operational. The connection must be free.
Diagnosis (service scans)
The following operating data is available
in the individual areas:
■ Temperatures
■ Status information, e.g. ON/OFF
■ Hours run
■ Advanced diagnosis overviews
Note
■ Type and number of menu points
depend on the heat pump, heating
system and current parameter set-
tings.
■ If a second heat pump stage is availa-
ble, some menu entries for stages 1
and 2 are listed separately, e.g. "Com-
pressor 2" or "Secondary pump 1".
■ Ú : Scroll to the right to display the
required information.
68
Cause
Heat pump control unit
restart.
Calling up diagnosis
Service menu:
1. Press OK + å simultaneously for
approx. 4 s.
2. "Diagnosis"
3. Select required area, e.g. "Heat
pump".
Measures
No measures required.