42 Pa.C.S. § 6910: Limitations on lessor's liability.

(a) Right to correct errors.--A lessor is not liable for any violation of the requirements of this chapter if, within 60 days after discovering an error and before an action for damages is filed against the lessor under section 6909 (relating to lessor's liability for noncompliance) or written notice of the error is received from the lessee, the lessor notifies the lessee of the error and makes adjustments to the account of the lessee that are necessary to assure that the lessee is not required to pay an amount in excess of the amounts permitted by this chapter. This subsection applies whether the error was discovered through the lessor's own procedures or by any other means.

(b) Limitation in damages.--A lessor is not liable under subsection (a) for damages in excess of actual damage sustained by the lessee if the lessor shows by a preponderance of the evidence that the violation of this chapter resulted from a bona fide error, notwithstanding the maintenance by the lessor of procedures reasonably adopted to avoid the error.

(c) Definition.--As used in this section, the term "bona fide error" includes, but is not limited to, clerical or calculation mistakes, computer hardware or software malfunctions and programming and printing errors.