Viessmann MatriX Service Instructions Manual page 30

Initial start−up, inspection and maintenance
Gas burner control unit
Cancelling a parameter set
If
H a parameter set has been modified via the DIP switches or
H if the gas burner control unit has been replaced,
a "P" flashes under Status. The figures under Service show the selected
parameter set (see page 31).
Status Service
"U" will appear under Service if an invalid DIP switch setting is selected.
Status Service
1. Check the DIP switch setting, alter
as per page 28 if required.
2. Press b and a simultaneously
for approx. 2 s.
When "P" no longer flashes and
the memory LED illuminates, the
selected parameter setting has
been accepted.
3. Press the reset button; the
operating display will be shown.
30
(cont.)