Viessmann MPA51 - Page 19

19
Fault
code
*1
Display System charac-
teristics
Cause Measures
F 4d F 4d Incorrect pass-
word for parame-
ter memory stick
Invalid password
entered for mem-
ory stick
Check password
and memory stick.
See installation in-
structions, burner
components.
F 4F F 4F Type of parameter
memory stick
Memory stick
does not match
burner control
unit
Replace stick or
burner control unit.
I
Danger
Plug-in termi-
nals on the
burner control
unit are 'live'.
Only replace
memory stick
when burner
control unit
has been iso-
lated from
power supply.
F 40 None Burner control unit
in fault state
Incorrect set de-
fault value for fan
in parameter set
Replace memory
stick.
I
Danger
Plug-in termi-
nals on the
burner control
unit are 'live'.
Only replace
memory stick
when burner
control unit
has been iso-
lated from
power supply.
F 41 F 41 Fan speed devia-
tion
Fan faulty; cable
"100A" faulty or
broken; fan un-
suitable for the re-
quired speed
Check cable and
replace cable
"100A" or fan if re-
quired
*1
All fault codes are saved to the fault memory and the last 10 can be called up.
Diagnosis
Diagnosis
(cont.)
5782 991 GB
Service