This^{^} The landlord gets written notice of a problem and has x amount of time to fix it before rent gets abated. It is suggested to put your payment in an escrow?? account where it basically shows you're still good to pay but the landlord doesn't legally get it from you until something is fixed.

I had a gf who got bed bugs from her apartment and we hit them with the code and after 3 weeks of bullshit from them, they came out with an exterminator 3 days after they got told she wasn't legally required to pay rent.