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Viessmann VITODENS 300 Service Instructions Manual page 87

Wall mounted gas fired condensing boiler. natural gas and lpg version. 4.2 to 13.0 kw
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Repairs
(cont.)
1. Pull the leads from flue gas tem-
perature sensor A.
2. Check the sensor resistance and
compare it with the curve.
3. Replace the sensor in case of
severe deviation.
Troubleshooting
87

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