42
Fault code dis-
played
System characteristics
Cause
Measures
F2
Burner in a fault state
Temperature limiter has
responded.
Check heating system fill level.
Check circulation pump. Vent the
system. Check the temperature
limiter and connecting leads (see
page 47).
Press "Reset" (see page 42).
F3
Burner in a fault state
Flame signal is already
present at burner start.
Check ionisation electrode and
connecting cable.
Press "Reset" (see page 42).
F4
Burner in a fault state
No flame signal.
Check the ignition/ionisation elec-
trode and connecting cable, gas
pressure, gas train, ignition and
condensate drain.
Press "Reset" (see page 42).
F8
Burner in a fault state
Fuel valve closes too late. Check gas train. Check both con-
trol paths.
Press "Reset" (see page 42).
F9
Burner in a fault state
Fan speed too low during
burner start
Check the fan, fan connecting ca-
bles, fan power supply and fan
control.
Press "Reset" (see page 42).
FA
Burner in a fault state
Fan idle state not reached Check the fan, fan connecting ca-
bles and fan control.
Press "Reset" (see page 42).
FC
Burner blocked
Electrical fan control (con-
trol unit) faulty
Check fan connecting cable; re-
place if necessary or replace con-
trol unit.
Fd
Burner blocked
Burner control unit fault
Check ignition electrodes and con-
necting cables. Check whether a
strong interference (EMC) field ex-
ists near the appliance.
Press "Reset" (see page 42).
Replace control unit if fault per-
sists.
FF
Burner blocked
Burner control unit fault
Check ignition electrodes and con-
necting cables. Check whether a
strong interference (EMC) field ex-
ists near the appliance.
Press "Reset" (see page 42).
Replace control unit if fault per-
sists.
Press reset (reset burner control unit)
Tap and hold
R
for approx. 2 s.
If the fault has been rectified, fault symbol " " disap-
pears and the default display is shown or a further fault
message is displayed.
If the fault persists, the fault message appears again.
Troubleshooting
Fault display
(cont.)
5697789
Diagnosis
Summary of Contents for Vitodens 111-W
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