Ariston ALTEAS ONE Net Series Installation And Servicing Instructions page 52

MAINTENANCE GUIDE
3.6 By-pass assembly
Tools
Drain the boiler (see 3.3). Rotate clockvise to unhook the
locking ring of the diverter valve.
1
Remove the clip and pull the assembly towards you
2
3
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3.7 Pump
Tools
TIME 5 min
Drain the boiler (see 3.3). Remove the clip and the two screws
1
Disconnect the pipe and then move the pump to the right to
disengage
2
Remove the pump
3
TIME 10 min