35 Pa. Stat. § 1700-1
Notwithstanding any other provision of law, or of any agreement, whether oral or in writing, whenever the Department of Licenses and Inspections of any city of the first class, or the Department of Public Safety of any city of the second class, second class A, or third class as the case may be, or any Public Health Department of any such city, or of the county in which such city is located, certifies a dwelling as unfit for human habitation, the duty of any tenant of such dwelling to pay, and the right of the landlord to collect rent shall be suspended without affecting any other terms or conditions of the landlord-tenant relationship, until the dwelling is certified as fit for human habitation or until the tenancy is terminated for any reason other than nonpayment of rent. During any period when the duty to pay rent is suspended, and the tenant continues to occupy the dwelling, the rent withheld shall be deposited by the tenant in an escrow account in a bank or trust company approved by the city or county as the case may be and shall be paid to the landlord when the dwelling is certified as fit for human habitation at any time within six months from the date on which the dwelling was certified as unfit for human habitation. If, at the end of six months after the certification of a dwelling as unfit for human habitation, such dwelling has not been certified as fit for human habitation, any moneys deposited in escrow on account of continued occupancy shall be payable to the depositor, except that any funds deposited in escrow may be used, for the purpose of making such dwelling fit for human habitation and for the payment of utility services for which the landlord is obligated but which he refuses or is unable to pay. No tenant shall be evicted for any reason whatsoever while rent is deposited in escrow.
35 P.S. § 1700-1