Viessmann Vitoflame 100 Service Instructions Manual page 30

Troubleshooting
Diagnostics
(cont.)
Fault/ Flash−
characteristics ing
code
red
2 ×
Burner starts
and ignition is
OK, but the ,
burner enters
2 ×
a fault state
after expiry of
the safety the safety
2 ×
time
Burner starts,
flame builds,
but the
system shuts
down after a
short while
(not a fault
shutdown)
7 ×
Burner goes
from
operation into
a fault state, ,
when flame is
7 ×
already
established
7 ×
7 ×
7 ×
30
Cause
Start gas volume
poorly adjusted
Ionisation current
too low (< 3.5 mA)
While the gas
combination valve
is opened, the
voltage briefly dips
below 180 V
Lack of gas
Ionisation current
too low (< 3.5 mA)
Electrode body
faulty
Ionisation current
too low because of
incorrect burner
settings
Faulty earthing
Burner control unit
faulty
Measure
Adjust start gas volume or
opening characteristics (see
page 14)
Check the position of the
ionisation electrode (see
page 21)
Check the electrical installation
Clean or replace gas filter.
Check the adjustment of the gas
pressure limiter.
Check the gas supply pressure.
Check the position and
condition of the sensor
electrode and modify or replace
the electrode, if required
Measure ionisation current and
replace ionisation electrode or
earth electrode, if required
Correct burner settings
Check the earth connection
Replace the burner control unit