Fault code
on the dis-
play
System character-
istics
Cause
Measures
F4
Burner in a fault
state
No flame signal.
Check the ionisation
electrode and cable,
measure the ionisation
current, check the gas
pressure, check the gas
train, ignition, ignition
module, ignition electro-
des and the condensate
drain.
Press "
E
RESET".
F8
Burner in a fault
state
The fuel valve
closes too late.
Check the gas train.
Check both control
paths.
Press "
E
RESET".
F9
Burner in a fault
state
Fan speed too
low during the
burner start
Check the fan, check
the fan cables and sup-
ply; check the fan con-
trol.
Press "
E
RESET".
FA
Burner in a fault
state
Fan not at stand-
still
Check the fan, fan con-
necting cables and fan
control.
Press "
E
RESET".
FC
Burner in a fault
state
Gas train faulty or
faulty modulation
valve control; or
flue gas path
blocked
Check the gas train.
Check the flue gas sys-
tem.
Press "
E
RESET".
Fd
Burner in a fault
state
Faulty burner
control unit or
boiler coding card
Check ignition electro-
des and connecting
cables.
Press "
E
RESET".
If the fault cannot be re-
moved, check the boiler
coding card or replace it,
if required, or replace
the control unit.
Fault codes
(cont.)
98
Troubleshooting
5592
883
GB
Summary of Contents for VITODENS 343-F WS4A
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