Viessmann VITODENS 100-W Installation And Service Instructions Manual page 60

Troubleshooting
Repairs
(cont.)
5. Remove two screws C from the
plate heat exchanger and remove
plate heat exchanger D with gas-
kets.
Note
During removal, small amounts of
water may trickle out and escape
from the plate heat exchanger.
6. Check the connections on the DHW
side for scale build-up and if required
clean or replace the plate heat
exchanger.
Checking the fuse
1. Switch off the power.
2. Open control unit casing (see
page 18).
3. Check fuse F4.
60
7. Check the heating water side for con-
tamination and if required clean or
replace the plate heat exchanger.
8. Install in reverse order using new
gaskets.
Note
During installation, ensure that fixing
holes are aligned and gaskets seated
correctly. Mount the plate heat
exchanger with the correct orienta-
tion.
F4