Viessmann Vitodens 300 Service Instructions Manual page 89

Type wb3a, 49 and 66 kw gas fired wall mounted condensing boiler natural gas and lpg version
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Repairs
(cont.)
1. Pull the leads from the flue gas
temperature sensor A.
2. Check the sensor resistance and
compare actual values with the
curve.
3. Replace the sensor in case of
severe deviation.
Troubleshooting
89

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