Viessmann VITODENS 100-W Installation And Service Instructions Manual page 44

For contractors. wall mounted gas condensing boiler natural gas and lpg version

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Table of Contents

Troubleshooting

Repairs

(cont.)

0.8

0.6

0.4

10 30 50 70 90 110

Temperature in °C

Checking cylinder temperature sensor (gas condensing boiler)

X21

X20

2. Check the sensor resistance and

compare it with the curve.

3. In case of severe deviation, drain

boiler on the heating water side and

replace the sensor.

Danger

The boiler water temperature

sensor is immersed in the

heating water (risk of scald-

ing).

Drain the boiler before replac-

ing the sensor.

1. Remove plugs % from the cable har-

ness and check the resistance.

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