Operating instructions

47
3.
Push the three-way valve drive A
slightly upwards.
4.
Turn the three-way valve B with
drive
A
1/8 anticlockwise and
remove.
5.
Remove two screws C from the
plate-type heat exchanger and
remove plate-type heat exchanger
D
with gaskets.
Note
During removal, small amounts of
water may trickle out and escape
from the removed plate-type heat
exchanger.
6. Check the DHW side for scaling and,
if required, clean or replace the plate-
type heat exchanger.
7. Check the heating water side for con-
tamination and, if required, clean or
replace the plate-type heat
exchanger.
8. Install in reverse order with new gas-
kets.
Note
Ensure that fixing holes and gaskets
are aligned. Install the heat plate
exchanger the correct way round.
Checking the fuse
F4
1. Switch OFF the power. 2. Open control unit casing (see
page 13).
Troubleshooting
Repairs
(cont.)
5366 836 GB
Service