Viessmann VITODENS 100-W Installation And Service Instructions Manual page 59

Wall mounted gas condensing boiler natural gas and lpg version

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Repairs

(cont.)

Checking or replacing the plate heat exchanger (gas condensing

combi boiler)

E Heating water flow

F Heating water return

1. Shut off and drain the boiler on the

heating water and the DHW side.

2. Pivot down control unit.

3. Push servomotor A slightly

upwards.

G Cold water

H DHW

4. Turn adaptor B with servomotor A

1/8 of a turn anticlockwise and

remove.

Troubleshooting

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