Troubleshooting
61
Corrective Action
(continued)
Check boiler temperature sensor, tank temperature sensor or
supply temperature sensor of the low-loss header
(continued)
2.
Check the sensor resistance and
compare the actual values with the
curve in the chart.
3.
If the value measured differs
significantly, replace sensor.
Check flue gas temperature sensor
When exceeding the maximum permissible flue gas temperature value, the flue
gas temperature sensor locks the appliance. Unlock the appliance by pressing
“
RESET” after the vent system has cooled down.
1.
Remove cables from flue gas
temperature sensor
A
.
2.
Check the sensor resistance and
compare the actual values with the
curve in the chart.
3.
Replace sensor in case of severe
deviation.
5
4
4
3
2
0
7
v
1
.5
10
1
50
86
122 158 194 230
68
104 140 176 212 248
0.2
0.4
0.6
0.8
2
4
6
8
20
40
R
e
s
is
ta
n
c
e
in
k
O
h
m
s
Water temperature in ºC
10
30
50
20
40
60
70
90
110
80
100 120
Water temperature in ºF
The boiler temperature sensor is
immersed in the heating water (risk
of scalding). Drain the boiler before
replacing the sensor.
WARNING
Fig. 22
A
A
Flue gas temperature sensor
10
1
50 86 122 158 194230
0.4
0.6
0.8
2
4
6
8
20
R
e
s
is
ta
n
c
e
in
k
O
h
m
s
Temperature in ºF
10 30 50 70 90 110
Temperature in ºC
