64
2.
Disconnect wires 7 and 8 from terminal 4.
3.
Check the sensor resistance. Compare the resist-
ance with the value for the current temperature
from the following diagram.
If the results are very different from the curve
(> 10 %), disconnect the wires from the sensor.
Repeat the test directly on the sensor.
Check the on-site lead. 2-core lead, length
up to 35 m with a cross-section of 1.5 mm
2
Depending on the test result, replace the lead or
the outside temperature sensor.
Flue gas temperature sensor
1.
Check the lead and plug of flue gas temperature
sensor
C
.
2.
Disconnect leads, flue gas temperature sensor
C
.
3.
Rotate sensor (anti-clockwise) by
¼
turn to remove
it (bayonet fitting).
4.
Check the sensor resistance. Compare the resist-
ance with the value for the currently recorded tem-
perature from the following diagram.
In the event of severe deviation (> 10 %), replace
the sensor.
5.
Rotate sensor (clockwise) by
¼
turn to install it.
Danger
Escaping flue gas can cause poisoning.
When restarting, check for leaks on the flue
gas side.
6.
Reconnect leads, flue gas temperature sensor
C
.
7.
If the permissible flue gas temperature has been
exceeded, the flue gas temperature sensor locks
out the appliance. Reset the burner on the pro-
gramming unit once the flue system has cooled
down.
■
Flue gas temperature sensor
■
Flow temperature sensor
■
Outlet temperature sensor
■
Outside temperature sensor
10
1
10
Temperature in °C
0.4
0.6
0.8
2
4
6
8
Resistance
in kΩ
30
50
70
90
110
20
Sensor type: NTC 10 k
Ω
100
10
-20 -10 0
10 20 30
Temperature in °C
6
8
20
40
60
80
200
Resistance
in kΩ
Sensor type: NTC 10 k
Ω
Fault during commissioning (fault message 416)
During commissioning, the control unit checks for cor-
rect placement of the flue gas temperature sensor. If
fault message 416 is displayed:
1.
Check whether the flue gas temperature sensor is
correctly installed (bayonet fitting). See previous
diagram.
2.
If required, correct the position of the flue gas tem-
perature sensor.
3.
Check the flue gas temperature sensor resistance.
See previous chapter. Replace faulty flue gas tem-
perature sensor if required.
4.
Turn off the ON/OFF switch.
5.
Turn the ON/OFF switch back on.
Restart the commissioning assistant.
6.
Check for leaks on the flue gas side.
Troubleshooting
Repairs
(cont.)
6174240
Diagnosis
