The Zoning Hearing Board or the hearing officer, as the case may be, shall render a written decision or, when no decision is called for, make written findings on the application within 45 days after the last hearing before the Zoning Hearing Board or hearing officer. Each decision shall be accompanied by findings of fact and conclusions based thereon, together with the reasons therefor. Conclusions based on any provisions of this chapter or of any act, rule or regulation shall contain a reference to the provision relied on and the reasons why the conclusion is deemed appropriate in the light of the facts found. If the hearing is conducted by a hearing officer and there has been no stipulation that his decision or findings are final, the Zoning Hearing Board shall make his report and recommendations available to the parties, and the parties shall be entitled to make written representations thereon to the Zoning Hearing Board prior to final decision or entry of findings, and the Zoning Hearing Board's decision shall be entered no later than 45 days after the decision of the hearing officer. Where the Zoning Hearing Board has power to render a decision and the Zoning Hearing Board or the hearing officer, as the case may be, fails to commence, conduct or complete the required hearing as required by this chapter, the decision shall be deemed to have been rendered in favor of the applicant unless the applicant has agreed in writing or on the record to an extension of time. Nothing in this subsection shall prejudice the right of any party opposing the application to urge that such decision is erroneous.