Viessmann Vitodens 200 Service Manual page 90

Troubleshooting
Repairs
(cont.)
Checking plate heat exchanger
K Heating return
L Cold water
1. Shut off and drain the boiler on
the primary and the secondary
side.
2. Release the lateral closures and
pivot the control unit A forward.
3. Pull leads from comfort
sensor B.
90
M Heating flow
N DHW
4. Remove the retaining clip and
siphon C.
5. Remove siphon pipe D from the
heat exchanger, together with the
inlet ferrule.
6. Fit gas supply pipe E.
7. Remove thermal insulation F.