Viessmann VITOPEND 200 Installation And Service Instructions Manual page 90
Gas fired combi boiler
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Troubleshooting
Repairs
(cont.)
90
1. Pull plug "X3" off the control unit.
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 the test directly at the sen-
sor.
4. Subject to result, replace the lead
or the outside temperature sensor.
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