Members of the Executive Committee (EC) are appointed by the Owners Corporation (O/C). So I gather from what you’re saying that a General Meeting (GM) of your O/C was convened, that Agendas were issued in advance to all Owners for that GM and for the subsequent EC Meeting, that somehow the Caretaker was able to convince some Owners to nominate themselves or to be nominated for positions on the Executive Committee (EC), and to then accept those nominations at the GM and thereby replace the existing Members, and that all of the above proceedings were minuted and distributed to all Owners.
If the above did not happen, then I’d suggest that the Provisions of the NSW Strata Schemes Management Act (1996) were breached (Pt3, Div1 & Sch3), and that the appointment of a new EC is invalid and could therefore be overturned by, in the first instance, you as an individual Owner or a number of like-minded Owners lodging this Form with OFT.
The OFT would also be interested to hear that your Caretaker is using the services of unlicensed persons to undertake works having a value>$1,000 – particularly as air conditioning and boiler works require Licensed Contractors irrespective of the value of the works.
If your Plan has a Strata Manager, I’d give them a courtesy “heads-up” about what you and (hopefully) other Owners intend to do about the concerns that you have raised.