67
3.
Enter password "viservice".
4. "Message history"
5.
■
"Faults"
to call up saved fault messages.
■
"Service messages"
to call up saved service
messages.
■
"Warnings"
to call up saved warning messages.
6.
If you wish to delete the list, tap .
7.
to confirm
Calling up fault messages on the programming unit of the fuel cell module
Use to select
"50"
in
ITEM
.
The current fault message of the fuel cell module is
displayed.
Explanation of fault messages: See chapter "Message
overview".
Resetting fault messages
Note
A fault must be rectified before it can be cleared.
Inform Viessmann Technical Service if necessary.
1.
Use to select
"52"
in
ITEM
.
2.
Press and hold
SET
for at least 3 s.
"_CL"
is displayed in
STATE
.
The fault message has been cleared.
Message overview
HMU heat management unit / fuel cell module fault messages
Message
System characteristics
Cause
Measures
F.21
Minimum runtime prediction
for fuel cell may be restricted.
If "F.23" or "F.24" are addi-
tionally shown, the fuel cell
will no longer start.
Lead break, cylinder tem-
perature sensor, middle
bottom
Check middle bottom cylinder tem-
perature sensor
%
: See chapter
"Temperature sensors, checking".
F.22
Minimum runtime prediction
for fuel cell may be restricted.
If "F.23" or "F.24" are addi-
tionally shown, the fuel cell
will no longer start.
Short circuit, cylinder tem-
perature sensor, middle
bottom
Check middle bottom cylinder tem-
perature sensor
%
: See chapter
"Temperature sensors, checking".
F.23
Control mode, ADIO electron-
ics module
Minimum runtime prediction
for fuel cell may be restricted.
If "F.21" or "F.22" are addi-
tionally shown, the fuel cell
will no longer start.
Lead break, cylinder tem-
perature sensor, middle
Check middle cylinder temperature
sensor
%
on EM-MX mixer exten-
sion kit: See chapter "Checking the
middle cylinder temperature sen-
sor".
F.24
Control mode, ADIO electron-
ics module
Minimum runtime prediction
for fuel cell may be restricted.
If "F.21" or "F.22" are addi-
tionally shown, the fuel cell
will no longer start.
Short circuit, cylinder tem-
perature sensor, middle
Check middle cylinder temperature
sensor
%
on the EM-MX mixer ex-
tension kit: See chapter "Checking
the middle cylinder temperature
sensor".
Troubleshooting
Fault display and other messages on the…
(cont.)
5839343
Diagnosis
Summary of Contents for E00T
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