Have you checked your AC drain lines lately? Contact an AC professional to check your AC system before the summer season starts. We get many calls during the year where policyholders see water leaking from the ceiling which may indicate air conditioner pan overflow. When both the primary and secondary drains are blocked overflow occurs.both drains. Bleach in the pan and primary line will help stop mold, mildew and algae from growing. A/C pan overflow is a covered peril under homeowners insurance but is subject to the deductible.