Viessmann VITODENS 333 Service Instructions Manual page 85

Repairs
(cont.)
Check the boiler temperature sensor, cylinder temperature
sensor or the flow temperature sensor for low loss header
1. Boiler temperature sensor: Pull the
leads from boiler temperature
sensor A and measure the resis-
tance.
Cylinder temperature sensor: Pull
the plug % from the cable harness
on the control unit and measure the
resistance.
Flow temperature sensor: Pull plug
X3 from the control unit and mea-
sure the resistance across term-
inals X3.4 and X3.5.
Troubleshooting
85