If the cited person, after exercising substantial efforts and reasonable diligence, is unable to complete the correction within the time allowed because of conditions beyond his control, he may request an extension of time in which to correct. Such request must be made in writing, and must be made prior to the expiration of the time allowed in the order of correction. An extension may be granted upon showing of good cause which determination is within the discretion of the Registrar. If a request for extension of time is not made prior to the expiration of time allowed in the order of correction, failure to correct within the time allowed shall constitute a violation of the order of correction whether or not good cause for an extension of time existed.