71
Message
System characteristics
Cause
Measures
F.304/C2F1
No power generation
Fault, stack voltage 2 (fuel
cell)
■
Check the balanced flue system
for:
–
Flue gas recirculation
–
Leaks
■
Check ventilation air supply for:
–
Ingress of flue gas due to insuf-
ficient clearance from,
for example, the flue system of
a solid fuel boiler
–
Outgassing/contamination in
the air supply system (e.g. sili-
cones, oils, paints, detergents,
deposits, etc.)
If the fault recurs, contact
Viessmann Technical Service.
Note
The fault message can
only
be
cleared on the programming unit of
the fuel cell module.
F.305/C2F2
No power generation
Fault, stack voltage 3 (fuel
cell)
■
Check the balanced flue system
for:
–
Flue gas recirculation
–
Leaks
■
Check ventilation air supply for:
–
Ingress of flue gas due to insuf-
ficient clearance from,
for example, the flue system of
a solid fuel boiler
–
Outgassing/contamination in
the air supply system (e.g. sili-
cones, oils, paints, detergents,
deposits, etc.)
If the fault recurs, contact
Viessmann Technical Service.
Note
The fault message can
only
be
cleared on the programming unit of
the fuel cell module.
F.341
Fuel cell in emergency mode
Communication error, fuel
cell
Check the connecting cable to the
fuel cell.
F.415
■
No current values of exter-
nal electricity meters
■
No power generation in
"Economical" and "Ecologi-
cal" operating modes
Note
Power generation possible
only with "Energy manager
OFF" operating mode.
Communication error CAN
bus
■
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.
Troubleshooting
Message overview
(cont.)
5839343
Diagnosis
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