49
Checking and cleaning the plate heat exchanger
Note
Drain the boiler on the heating water and DHW sides.
A
2x
B
Fig. 45
1.
Undo plate heat exchanger
A
(screws
B
) and
remove towards the front.
2.
Check the connections on the heating water and
DHW sides for contamination and scaling; replace
the plate heat exchanger if necessary.
3.
Install in reverse order using new gaskets.
Checking the fuse
F4
Fig. 46
1.
Switch OFF the power supply.
2.
Open the control unit enclosure (see page 15).
Troubleshooting
Repairs
(cont.)
5697789
Diagnosis
Содержание Vitodens 111-W
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