My landlord won't fix it in the NT. What can I do?

Yes, if unsafe or unlivable. After written notice you can arrange late repairs, up to 2 weeks' rent.

Your clock

The rule in the NT

You can ask to deduct the cost from rent. Otherwise rent stays due, and unpaid rent can lead to termination.

What to send

I told you in writing on [date] that [problem] needs repair. 7 business days have passed.

Who to call

Where this comes from

General information, not legal advice on your situation.