Me. Stat. tit. 14 § 6015-2

more, the landlord must provide at least 75 days' written notice to the tenant. If the landlord increases rent more than once in a 12-month period, and the increases add up to a total increase of 10% or more

Me. Stat. tit. 14 § 6016

Rent increase limitation Rent charged for residential estates may not be increased if the dwelling unit is in violation of the warranty of habitability. Any violation caused by the tenant, his family, guests or invitees shall not bar a rent