Anything that's an immediate risk to safety, security or further property damage — burst water mains, electrical faults, broken external doors and locks, lift entrapments, fire system failures, gas leaks and storm damage.
The strata manager has standing authority to order emergency repairs without committee approval — that's exactly what the after-hours service is for. Non-emergency works (a slow drip, a noisy door, a flickering light) follow normal quote-and-approval processes.
Compare written fee proposals from strata managers covering your building — free for owners corporations, no obligation.