Viessmann Vitoligno 300-P Service Instructions For Contractors page 87

Repairs
(cont.)
Check 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
Protection
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 121.
Viessmann
Ni500
IP 43
−40 to + 70 °C
1. Pull plug !.
2. Check the sensor resistance at the
plug.
3. Disconnect conductors from the sen-
sor, if the actual values deviate
severely from the curve, repeat the
sensor test and compare with the
actual temperature (for scanning, see
chapter "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").
Troubleshooting
87