Viessmann MPA51 Operating And Service Instructions page 11

Burner control unit
Status Service
Fault memory
The most recent 10 faults are saved and
may be called up. The order of scans
ranges from the most recent to the ear-
lier fault codes. If no key or the reset but-
ton is pressed within 20 s the fault mem-
ory display is terminated automatically.
1. Calling up the fault
Status Service
(cont.)
1. Press a.
2. Press b.
3. Hold down the reset button for longer
Note
The burner starts up again after a fault.
To establish the cause of the fault, check
the fault memory.
1. Press the reset button and key a
Burner control unit
The operating phase under which the
fault occurred is displayed under
"Service" for as long as this key is
held down. (Phase from "01" to "36".
See flow diagram on page 24).
For as long as this key is held down,
additional fault information is dis-
played under "Service".
than ¼ s.
The operating display is shown
again. The burner control unit is
reset.
simultaneously.
The most recent fault is displayed:
Initially, "0" is displayed under "Sta-
tus".
The fault code is displayed under
"Service".
11