Checking The Boiler Temperature Sensor, Cylinder Temperature Sen- Sor Or Flow Temperature Sensor For Low Loss Header - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

Troubleshooting
Maintenance
(cont.)
Checking the boiler temperature sensor, cylinder temperature sensor or flow temperature sen-
sor for low loss header
5
Fig. 58
92
X3
1. ■ Boiler water temperature sensor
Pull out the leads at boiler water temperature sen-
sor and check the resistance.
A
Cylinder temperature sensor
■
Pull plug
%
unit and check the resistance.
■ Flow temperature sensor
Pull out plug "X3" at the control unit and check
the resistance across terminals "X3.4" and "X3.5".
from the cable harness at the control