Fault Messages - Viessmann VITOCAL 242-G Installation And Service Instructions Manual

Control unit diagnostics
Programming unit overview
A Display
B Rotary selector "Reduced room
temperature"
C Rotary selector "Standard room
temperature"

Fault messages

Internal faults are captured, displayed
and saved by the device.
If there are active faults:
The red LED to the left of the Opto-
link interface flashes (C in fig. on
page 192).
When the flap of the programming
unit is closed, the fault symbol "U"
flashes on the display.
If a Vitotrol 200 remote control is
connected, its red fault indicator
also flashes.
D Operating mode selector
E Menu keys
F Programming unit flap
A maximum of eight faults can be
stored.
Troubleshooting
123