Viessmann Vitodens 200 Start-Up/Service Instructions page 36

Troubleshooting
Correction
(continued)
36
Check DHW outlet temperature sensor
or comfort sensor (Combi boiler only)
1. Disconnect cables from the DHW outlet temperature
sensor A ( $ sensor) or the comfort sensor B
(% sensor).
2. Measure resistance of the sensor and compare with
the resistance/temperature curve shown on the left.
3. If the value measured differs significantly, replace the
sensor.
IMPORTANT
DHW outlet temperature sensor. The sensor is located
directly in the DHW connection flange.
Before replacing:
Close the cold water shutoff valve.
Drain the domestic hot water pipe and the plate heat
exchanger (secondary circuit).
Comfort sensor
When installing, push sensor into tabs on plate heat
exchanger.
Vitodens 200 WB2 Service