Carefully open the closed valves.
Look for any water leakage.
5.
Check the system pressure on the
manometer (BP5). Top up the sys-
tem with water if necessary.
The climate system's safety valve
(FL2) must be completely sealed.
6.
Vent the system via the vent valves
QM20), (QM24) and (QM60.
7.
Remove the old CPU board (AA21)
and install the new one.
Take care with the connections on
the board.
8.
| GB22
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