Viessmann MPA51 - Page 18

18
Fault
code
*1
Display System charac-
teristics
Cause Measures
F A9 F A9 Flame extinguish-
es during stabilis-
ing time
Incorrect parame-
ter memory stick
inserted
Replace and ena-
ble parameter
memory stick
F A9 F A9 Flame extinguish-
es during stabilis-
ing time
Combustion char-
acteristics not ide-
al
Adjust the burner
F 04 F 04 Burner control unit
lockout
Burner control unit
has been reset
more than 5 times
in the last 15 min
Wait or carry out an
extended reset,
i.e. hold down reset
for approx. 10 s un-
til the fault display
begins to flash,
then immediately
release the reset
button
F 11 None Burner switches
off; display only in
fault memory
Low voltage de-
tected
Check power sup-
ply
F 12 None Burner switches
off; display only in
fault memory
Mains failure, volt-
age failure detec-
ted
Check power sup-
ply
F 13 F 13 Burner control unit
in fault state
Safety chain is
'live'
Check safety chain
(strapping plug
fJ
)
F 16 None Burner control unit
in fault state
EMC fault Have your system
tested for EMC in-
terference
F 4b F 4b Parameter memo-
ry stick not found
Parameter set en-
abled, but memo-
ry stick not plug-
ged into burner
control unit. Mem-
ory stick faulty
Plug memory stick
into burner control
unit; replace mem-
ory stick
F 4c None Parameter memo-
ry stick matching
Parameters could
not be transferred
from the stick
Replace stick or
burner control unit
*1
All fault codes are saved to the fault memory and the last 10 can be called up.
Diagnosis
Diagnosis
(cont.)
5782 991 GB