Viessmann MatriX Service Instructions Manual page 31

Gas burner control unit
Fault display
The fault display will be activated automatically if the gas burner control unit
changes into a fault state. The most recent fault will then be displayed. The
light segments of the display will flash.
Operating display
Automatic
activation
for fault setting
Status Service
Operating display
Initial start−up, inspection and maintenance
(cont.)
Fault code
Status Service
Status Service
Press the reset button
As long as key a is
pressed, the operating
phase where the fault
occurred will be
displayed (see Fig.
on page 38)
The additional fault
information will be
displayed for as long
as key b is held down.
31