Viessmann VITODENS 200-W Installation And Service Instructions For Contractors page 106

Troubleshooting
Repairs
(cont.)
Cylinder temperature sensor/outlet temperature
sensor
1. Check lead and plug of cylinder temperature sen-
sor or outlet temperature sensor
%
2. Disconnect wires of sensor plug.
3. Check the sensor resistance. Compare the resist-
ance with the value for the current temperature
from the following diagram.
In the event of severe deviation (> 10 %), replace
the sensor.
Low loss header sensor
1. Check lead and plug of temperature sensor
the ADIO electronics module (mixer extension kit).
2. Disconnect wires of sensor plug.
3. Check the sensor resistance. Compare the resist-
ance with the value for the current temperature
from the following diagram.
In the event of severe deviation (> 10 %), replace
the sensor.
Outside temperature sensor
1. Check the lead and plug of the outside tempera-
ture sensor.
2. Disconnect wires 1 and 2 from the external plug.
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
Depending on the test result, replace the lead or
the outside temperature sensor.
106
Flue gas temperature sensor
1. Check the lead and plug of flue gas temperature
sensor
.
$
2. Disconnect leads, flue gas temperature sensor
3. Rotate sensor (anti-clockwise) by
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.
on 5. Rotate sensor (clockwise) by
)
6. Reconnect leads, flue gas temperature sensor
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.
2
.
C
turn to install it.
¼
Danger
Escaping flue gas can cause poisoning.
When restarting, check for leaks on the flue
gas side.
.
C
turn to remove
¼
.
C