183A refers to “Orders relating to caretaker agreements”. Only the Owners Corporation can challenge a caretaker agreement BUT unless a general meeting of the Owners Corporation over-rules the Exec Committee, the EC's decisions are taken as being the OC's.
I may be wrong – and I hope someone corrects me if I am – but provided the cost of the legal action is less than $12,500 (or $1,000 per unit, whichever is less) the EC can get legal advice for a challenge on the Caretaker Contract. However, if a General Meeting is called that tells the EC not to take action, then it can't.