Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors page 120

Troubleshooting
Fault messages on the gas condensing...
Control unit System characteristics
message
F.303/C2F0 No power generation
F.304/C2F1 No power generation
120
(cont.)
Cause
Fault, stack voltage 1 (fuel
cell)
Fault, stack voltage 2 (fuel
cell)
Measures
Check balanced flue system for:
■
– Flue gas recirculation
– Leaks
Check ventilation air supply for:
■
– Ingress of flue gas due to non-
compliance with chimney clear-
ances, e.g. by a solid fuel boil-
er
– Outgassing/contamination in
the air supply system (e.g. sili-
cones, oils, paints, detergents,
deposits, etc.)
If faults recur, contact Viessmann
Technical Service.
Note
Fault message can only be reset
on the programming unit of the fuel
cell module.
Check balanced flue system for:
■
– Flue gas recirculation
–
Leaks
Check ventilation air supply for:
■
–
Ingress of flue gas due to non-
compliance with chimney clear-
ances, e.g. by a solid fuel boil-
er
–
Outgassing/contamination in
the air supply system (e.g. sili-
cones, oils, paints, detergents,
deposits, etc.)
If faults recur, contact Viessmann
Technical Service.
Note
Fault message can only be reset
on the programming unit of the fuel
cell module.