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Troubleshooting
Fault codes
(cont.)
Display fault
System char-
code
acteristics
F6
Burner control
unit fault
F8
Burner control
unit fault
F9
Burner control
unit fault
Burner control
unit fault
FA
Burner control
unit fault
Fd
Burner
blocked
FB
Burner control
unit fault
74
Cause
No control/feedback of/
from fuel valve BV 2
The fuel valve 1 closes
too late
Fan speed too low during
burner start
The fan power supply is
interrupted.
The fire protection
switch or flue gas ther-
mostat is faulty or has
responded
The jumper across
terminals 1 and 2 in wir-
ing chamber 201 is bro-
ken or has been
removed
Fan speed
deviation
Burner control unit fault
Flame blow-off three
times during operation
Measures
Replace fuel
valve BV 2.
Press "E".
Check the nozzle,
vent the oil supply
pipe,
check the sole-
noid valve.
Press "E".
Check the fan,
check the fan con-
necting cables,
check the fan
power supply.
Press "E".
Check the fire
protection switch
or the flue gas
thermostat.
Check the jumper
in wiring chamber
201 (see page
100).
Press "E".
Check the fan and
the fan connecting
cables,
Press "E".
Press "E".
Replace the con-
trol unit if the dis-
play shows "Fd"
again.
Check the oil sup-
ply; check the
nozzle.
Press "E".
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