Viessmann VITODENS 100-W Installation And Service Instructions Manual page 74

Gas fired wall mounted condensing boiler natural gas version type wb1a

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Troubleshooting

Repairs

(cont.)

Check the DHW temperature sensor (only for gas combina-

tion devices)

1. Pull the leads from outlet tempera-

ture sensor A

2. Check the sensor resistance and

compare actual values with the

curve.

3. Replace the sensor in case of

severe deviation.

Note

Water can leak out when replacing

the outlet sensor. Close the cold

water shut-off valve. Drain DHW

pipe and plate heat exchanger

(secondary side).

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