Viessmann Vitoplus 300 Service Instructions Manual page 76

Wall mounted oil fired condensing boiler for the combustion of low sulphur fuel oil din 51603-el-1 with integral boiler control unit
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Troubleshooting
Repairs
(cont.)
76
2. Test the resistance of the outside
temperature sensor across term-
inals "X3.1" and "X3.2" on the dis-
connected plug and compare it with
the curve.
3. Where actual values strongly devi-
ate from the curve values, discon-
nect the wires at the sensor and
repeat test immediately at the sen-
sor.
4. Depending on the result, replace
the lead or the outside temperature
sensor.

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