Viessmann MPA51 - Page 10

10
Manual mode and service display
To call up the service display and for
manual mode, the control unit must be
issuing a heat demand. The service dis-
play shows the current modulation level
in %.
Display:
"d 0" Lower heating output
"d 00" Upper heating output
Status Service
1.
Press b and S simultaneously to
switch the burner to manual mode.
The display shows "d" = control stop
under status.
2. Adjust the lower heating output:
Press
b
until the display
shows "d 0".
3. Adjust the upper heating output:
Press
a
until the display shows
"d 00".
4.
Pressing b and S simultaneously
returns the burner to modulating
mode. The burner continues at the
original modulation level at which the
status "d" = control stop was initi-
ated.
Fault display
If the burner control unit switches to a
fault state, the fault display is automati-
cally activated. The most recent fault is
then displayed.
Status Service
A Fault code of the most recent fault
(see table on page 13)
Burner control unit
Burner control unit
(cont.)
5782 991 GB