1. Remove the front panel of the module box
( “7.1 Remove the front panel of the module
box” on page 18).
2. Close shut-off valves to the heating circuit.
3. Drain the unit via the lling and drain tap of the
heating.
► Unit without cooling:
► Unit with cooling:
4. Use a spanner to close the shut-off valves of the
heat source (behind the covers).