Checking The Boiler Water Temperature Sensors, Cylinder Tempera- Ture Sensor Or Flow Temperature Sensor For The Low Loss Header - Viessmann Vitodens 200-W Series Installation And Service Instructions Manual

Repair
(cont.)
Checking the boiler water temperature sensors, cylinder temperature sensor or flow tempera-
ture sensor for the low loss header
A
§
B
§
%
X3
Fig. 48
1. Boiler water temperature sensor 1
■
Pull the leads from boiler water temperature sen-
sor A and check the resistance.
§
Boiler water temperature sensor 2
■
Pull the leads from boiler water temperature sen-
sor B 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 terminals "X3.4" and "X3.5".
Troubleshooting
87