Viessmann Vitocrossal 200 Series Service Instructions Manual page 45

Fault codes
(cont.)
Fault code dis- System characteristics
played
F EB Burner blocked
F EC Burner control unit in a fault
state
F ED Burner control unit in a fault
state
F F1 Burner control unit in a fault
state; system cools down.
F F2 Burner control unit in a fault
state; system cools down.
F FB Burner does not start
Internal system faults
Internal system faults will be shown if the correct pro-
gram sequence can no longer be guaranteed.
Displayed fault System characteristics
code
F E5, F EC, Fault in burner control unit
F ED, F FF area
F FD Fault in burner control unit
area
Cause
Burner not enabled via ex-
ternal contact.
Internal error in feedback
from safety relay.
Internal error in feedback
from ignition relay.
Flue gas temperature lim-
iter has responded
Flue gas temperature
■
too high
Excessive gas through-
■
put
Boiler water temperature
limiter has responded.
Boiler water temperature
too high.
Combustion chamber
■
pressure too high
(LDW2)
Condensate backed up
■
Flue gas path blocked
■
Flue gas flap does not
■
open or close
Burner control unit con-
■
figured incorrectly
Cause
Internal system fault and
EMC
See the following table
Troubleshooting
Measures
Check components connected to
TR/TR EIN at plug of the
aBÖ
Vitotronic.
Reset the burner control unit. Re-
place burner control unit if re-
quired.
Reset the burner control unit. Re-
place burner control unit if re-
quired.
Wait until temperature falls below
■
the permissible flue gas tempera-
ture.
Check the system pressure.
■
Check heat exchanger surfaces
■
for soiling.
Reset burner control unit.
■
Check the CO setting.
■
2
Adjust gas throughput in accord-
■
ance with the rated boiler heating
output. See "Specification" for
connected values.
Wait until temperature falls below
■
the permissible boiler water tem-
perature.
Reset burner control unit.
■
Check condensate drain and flue
■
gas path for blockages.
Check flue gas damper.
■
Check motorised flue gas damp-
■
er operating parameters.
Measures
Reset burner control unit. Replace
the burner control unit if the fault
persists.
See the following table
45