Viessmann Vitopend 100-W Installation And Service Instructions Manual page 74

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