Viessmann Vitoflame 100 Service Instructions Manual page 29

Diagnostics
(cont.)
Fault/ Flash−
characteristics ing
code
red
4 ×
Burner does
not start and
enters fault
state after
4 ×
approx. 65 s
3 ×
The burner
motor starts, ,
b but the burner h b
3 ×
suffers a fault
shutdown
during the during the
3 ×
pre−purge
phase
2 ×
Burner starts,
but no flame o a e
builds
2 ×
2 ×
2 ×
2 ×
2 ×
2 ×
Cause
Air pressure limiter
Earth conn. at
ionisation cable or
electrode
Air pressure switch
conn. contaminated
Air press. switch
incorrectly adj. or
faulty
Air pressure too
low
Ign. electrode
incorrectly adj.
Ign. electrode damp
and contaminated
Ins. body of the ign.
electrode cracked
Ign. transformer
faulty
Ign. cable shorting
out to earth
Insufficient
combustible gas
mixture available
The gas solenoid
valves do not open
Troubleshooting
Measure
Check the setting of the air
pressure switch; replace the
switch, if required
Remedy short circuit
Clean connection
Adjust the air pressure switch
(see page 18) or replace it
Clean the impeller (see page 19)
Adjust correctly (see page 21)
Clean ignition electrode
Replace ignition electrode
Replace ignition transformer
Replace ignition cable
Vent gas supply line to the
outside. Check with a test
burner, whether sufficient
combustible gas is available.
Check the electrical connection;
test the voltage across the gas
combination valve (230 V).
Replace the gas combination
valve if voltage is present
across the gas combi valve.
29