Witholding rent for repairs or mold

By Curious

My friend has lived in this house for 8 months and was late on his rent in June.  Since then the landlord has been picking at him for things in the lease, such as a van in the driveway that hasn’t been driven for some time.  The renter has issues with mold in the house and has told the landlord, but the landlord won’t do anything until the van is moved.  She also threatened him with a 3 day notice if he didn’t get the water bill current and the water company told him he could pay the bill in a week.  There is also a faulty boiler in the house that needs repair.  Can he withhold rent if the landlord won’t fix the mold?  Also, he has a boiler that isn’t working that she hasn’t repaired.  Can he withhold rent if she will not fix things brought to her attention?  She keeps threatening him with 3 day notices.

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Holy Cow, we couldn't find any other related post. Sorry. :(