Viessmann VITODENS 050-W Installation And Service Instructions Manual page 65

Repairs
(cont.)
Note
During and after removal, small
amounts of water may trickle from
the plate heat exchanger.
3. Check the connections on the DHW
side for scaling; clean or replace
the plate heat exchanger if
required.
4. Check the connections on the heat-
ing water side for contamination;
clean or replace the plate heat
exchanger if required.
Checking the fuse
F4
1. Switch off the power supply.
5. Install in reverse order using new
gaskets.
Note
During installation, ensure the fixing
holes are aligned and the gaskets
are seated correctly. Fit the plate
heat exchanger the right way
round.
2. Open the control unit enclosure.
Troubleshooting
65