Viessmann VG III - Combustion errors and flue gas issues

31
Troubleshooting
Diagnostics (cont.)
Fault/behaviour
of the system
Flashing
code red
Cause Remedy
Burner goes
from operation
into a fault
state, when
7Ă× Ionisation current too
low (<4 µA)
Check position or
condition of sensor
electrode and change
or replace if necessary
,
flame is
already
established
7Ă×
Electrode body faulty Measure ionisation
current and replace
ionisation electrode or
earth electrode if
necessary
Burner goes
from operation
into a fault
state, when
7Ă× Ionisation current too
low because of
incorrect burner
settings
Correct burner
settings
,
flame is
already
7Ă× Faulty earthing Check earthing
a
l
rea
d
y
established
7Ă×
Burner control unit
faulty
Replace burner
control unit
Flame tears off
during
7Ă× Mixer assembly
contaminated
Clean mixer assembly
g
operation
7Ă×
Incorrect air damper
position
Correct switching cam
setting on air damper
motor (see page 9)
Combustion
errors through
pulsation
Gas throughput too
high
Set gas throughput in
accordance with rated
boiler output
p
Mixer assembly
(stage 2) incorrectly
adjusted
Change mixer
assembly settings
(see page 48)
Incorrect air damper
position
Correct switching cam
setting on air damper
motor (see page 9)
Combustion chamber
pressure is too high
Check pressure in
combustion chamber
and clean boiler if
necessary
5692Ă534ĂGB