Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual page 107

Repairs
(cont.)
8. Remove plate-type heat exchan-
ger F.
Note
During removal, small amounts of
water may trickle out and escape
from the removed plate-type heat
exchanger.
9. Check the connections on the
DHW side for scaling and, if
required, flush or replace the
plate-type heat exchanger.
Check the temperature limiter
10. Check the connections on the
heating water side for contamina-
tion and, if required, flush or
replace the plate-type heat
exchanger.
11. Lubricate the new gaskets/seals.
Install in reverse order with new
gaskets.
Troubleshooting
107