74
Displayed
fault code
System character-
istics
Cause Measures
F03 Burner in a fault
state
Flame signal is al-
ready present at
burner start.
Check ionisation elec-
trode and connecting ca-
ble.
Turn the ON/OFF switch
off and back on again
(or reset, see F02).
F04 Burner in a fault
state
No flame signal. Check the ignition/ionisa-
tion electrodes and con-
necting cables, check the
gas pressure, check the
gas train, check the igni-
tion and ignition module.
Turn the ON/OFF switch
off and back on again
(or reset, see F02).
F05 Burner control unit in
fault state
The air pressure
switch is closed
during the burner
start or does not
close when the ig-
nition load has
been reached.
Check the balanced flue
system, the air pressure
switch hoses, the air
pressure switch and con-
necting cables.
Turn the ON/OFF switch
off and back on again
(or reset, see F02).
F07 Burner locked out Lead break, water
pressure sensor
Check the water pres-
sure sensor.
Turn the ON/OFF switch
off and back on again
(or reset, see F02).
F08 Burner in a fault
state
Gas solenoid
valve relay
blocked
Check relay, gas sole-
noid valve and connect-
ing lead.
Turn the ON/OFF switch
off and back on again, or
perform a reset – see
F02.
F10 Continuous opera-
tion
Short circuit, out-
side temperature
sensor or room
temperature sen-
sor
Check the sensor (see
page 77).
Troubleshooting
Fault display
(cont.)
5837146
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