72
Message
System characteristics
Cause
Measures
F.425
System in control mode, cal-
culation out of operation
Time synchronisation
failed.
Set the time.
If external time is used, check pa-
rameters "1504" and "508".
F.472
Control mode without elec-
tricity meter data
Communication error,
electricity meter
■
Check CAN bus connection to
the external electricity meter (ob-
serve polarity and correct if nec-
essary).
■
Check setting of CAN bus termi-
nator switch: See page 31.
■
Disconnect electricity meter from
power supply then reconnect.
F.475/42F1
No power generation
Air in the system separa-
tion circuit or system sep-
aration circuit not filled
Fill and vent the system separation
circuit.
Note
The message can
only
be cleared
on the programming unit of the fuel
cell module.
F.523/18F0
No power generation
Fault, reformer burner ig-
nition
Reset the fault once.
If the fault recurs, notify Viessmann
Technical Service.
F.524/18F1
No power generation
Fault, reformer burner ig-
nition
Reset the fault once.
If the fault recurs, notify Viessmann
Technical Service.
F.538
Control mode
Lead break, system return
temperature sensor
Check system return temperature
sensor
?
on EM-MX mixer exten-
sion kit: See chapter "Checking the
system return temperature sensor".
F.539
Control mode
Short circuit, system re-
turn temperature sensor
Check system return temperature
sensor
?
on EM-MX mixer exten-
sion kit: See chapter "Checking the
system return temperature sensor".
F.655
Mixer will be closed.
No return temperature rais-
ing.
No cylinder heating.
Lead break, temperature
sensor, raised system re-
turn
Check raised system return tem-
perature sensor
?
on EM-MX mix-
er extension kit: See chapter
"Checking the raised system return
temperature sensor".
F.656
Mixer will be closed.
No return temperature rais-
ing.
No cylinder heating.
Short circuit, temperature
sensor, raised system re-
turn
Check raised system return tem-
perature sensor
?
on EM-MX mix-
er extension kit: See chapter
"Checking the raised system return
temperature sensor".
"Service messages"
HMU heat man-
agement
unit / fuel cell
module mes-
sage
System characteristics
Cause
Measures
P.1
—
Interval until the next serv-
ice
Perform maintenance.
P.4
—
—
Top up heating water
Troubleshooting
Message overview
(cont.)
5839343
Diagnosis
Содержание E00T
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