Viessmann MPA51 - Page 21

21
Fault
code
*1
Display System charac-
teristics
Cause Measures
F 54 F 54 PWM values in-
correct
EEPROM of
memory stick
modified or de-
leted. Memory
stick faulty
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 55 F 55 Parameter memo-
ry stick fault
Memory stick faul-
ty
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.
*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