Viessmann Vitodens 100 Series Installation And Service Instructions Manual page 79

Repairs
(cont.)
Checking or replacing the plate heat exchanger (gas condens-
ing combi boiler)
C
F
C Heating water flow
D Heating water return
E Cold water
1. Shut off and drain the boiler on the
heating water and DHW sides.
2. Pivot the control unit downwards.
B
D
E
A
F DHW
3. Undo 2 screws A on plate heat
exchanger B and remove plate
heat exchanger with gaskets.
Note
During and after removal, small
amounts of water may trickle from
the plate heat exchanger.
Troubleshooting
B
79