Viessmann VITODENS 200-W Service Instructions Manual page 107

Repair
(cont.)
Checking the boiler water temperature sensor, the cylinder tem-
perature sensor or the flow temperature sensor for the low loss
header
A
5
X3
1. ■ Boiler water temperature sensor:
Pull the leads from boiler water
temperature sensor A and check
the resistance.
■ Cylinder temperature sensor: Pull
plug % from the cable harness at
the control unit and check the
resistance.
■ Flow temperature sensor: Pull plug
"X3" from the control unit and
check the resistance across termi-
nals "X3.4" and "X3.5".
Troubleshooting
107