Pennsylvania Statutes Title 73 P.S. Trade and Commerce § 500-206. Provisions expressly prohibited

(a) The buyer agrees not to assert against a contractor a claim or defense arising out of the sale or agrees not to assert against an assignee such a claim or defense other than as provided in section 208.  1

(b) In the absence of the buyer's default in the performance of any of his obligations, the holder may, arbitrarily and without reasonable cause, accelerate the maturity of any part or all of the amount owing thereunder.

(c) The buyer waives any right of action against the contractor or holder of the contract, or other person acting on his behalf, for any illegal act committed in the collection of payments under the contract.

(d) The buyer relieves the contractor from liability for any legal remedies which the buyer may have against the contractor under the contract or any separate instrument executed in connection therewith.

(e) The contractor or holder, or any person acting on behalf of the contractor or holder, is authorized to enter upon the premises of the buyer unlawfully.

(f) The seller is entitled to liquidated damages in an amount which exceeds ten per cent of the cash price stated in the contract in the event of the buyer's failure or refusal to accept delivery of the goods or performance of the services covered by the contract.

Any such prohibited provision shall be void but shall not otherwise affect the validity of the contract.