Checking the outside temperature sensor (weather-compen-
sated control unit)
1.
Pull plug X3 from the control unit.
2.
Test the resistance of the outside
temperature sensor across term-
inals X3.1 and X3.2 on the pulled
plug and compare with the curve.
3.
Where actual values strongly devi-
ate from the curve values, discon-
nect the wires at the sensor and
repeat test directly at the sensor.
4.
Depending on the result, replace
cable or outside temperature sen-
sor.
Repairs
84
Troubleshooting
56
92
548
GB
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