Procedure delays occurred as evacuations were conducted due to the reported event.A steris service technician arrived onsite and spoke with user facility personnel about the reported event.The technician confirmed that user personnel began running a dart test cycle when the sterilizer began making a "noise".No instruments were present in the cycle.The employee cancelled the cycle.After the cycle cancelled, the user facility personnel opened the sterilizer door, and steam emitted from the sterilizer causing the reported event.The technician was able to identify the root cause of the reported steam leak to be attributed to the s2 piston.The s2 piston is a valve within the steam manifold that allows steam into the chamber during operation.The technician noted there was debris built up in the steam manifold that was allowing the s2 piston to stay open subsequently allowing excess steam into the sterilizer chamber.The technician made the necessary repairs, ran a test cycle, and found the unit to be operating according to specification.No additional issues have been reported.
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