Viessmann MPA51 Operating And Service Instructions page 10

Burner control unit
Burner control unit
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 %.
Status Service
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
10
(cont.)
Display:
"d 0"
"d 00" Upper heating output
1. Press b and S simultaneously to
2. Adjust the lower heating output:
3. Adjust the upper heating output:
4. Pressing b and S simultaneously
A Fault code of the most recent fault
(see table on page 13)
Lower heating output
switch the burner to manual mode.
The display shows "d" = control stop
under status.
Press b until the display
shows "d 0".
Press a until the display shows
"d 00".
returns the burner to modulating
mode. The burner continues at the
original modulation level at which the
status "d" = control stop was initi-
ated.