Operating instructions

133
Checking the plate heat exchanger
B
F G H K
EDC
A
F
Heating return
G
Cold water
H
Heating flow
K
DHW
1. Shut off and drain the boiler on the
heating water and DHW sides.
2. Release the side closures and pivot
the control unit forward.
3. Disconnect leads from comfort sen-
sor
A
.
4. Remove the retaining clip and siphon
B
.
5.
Remove thermal insulation C.
6.
Undo screws D and remove plate
heat exchanger
E
through the
front.
Note
During disassembly and once
removed, small amounts of water
may escape from the plate heat
exchanger.
7. Check the connections on the DHW
side for scaling, and if required clean
or replace the plate heat exchanger.
8. Check the connections on the heat-
ing water side for contamination, and
if required clean or replace the plate
heat exchanger.
9. Install in reverse order using new
gaskets.
Troubleshooting
Repairs
(cont.)
5772 909 GB
Service