Viessmann VITOLIGNO 300-P Service Instructions Manual page 98

Troubleshooting
Repairs
(cont.)
Checking the outside temperature sensor
600
580
560
540
520
500
480
460
440
420
400
-40 -30 -20 -10 0 10 20 30
Outside temperature in °C
Specification
Sensor type
IP rating
Permissible ambient
temperature during
operation, storage
and transport
Contact temperature sensor and immersion temperature sensor
For capturing the flow temperature.
Connection
See chapter "Connection and wiring dia-
gram" from page 133.
98
Viessmann
Ni500
IP 43
−40 to + 70 °C
1. Pull plug !.
2. Check the sensor resistance at the
plug.
3. If the actual values deviate severely
from the curve, disconnect conduc-
tors from the sensor, repeat the sen-
sor test and compare with the actual
temperature (for scanning, see chap-
ter "Temperatures, boiler coding card
and brief scans").
4. Depending on the result, replace the
lead or the outside temperature sen-
sor.
5. Scan the actual temperature (for
scanning, see chapter "Tempera-
tures, boiler coding card and brief
scans").