A steris service technician arrived onsite to inspect the washer.The technician ran a test cycle and observed the washer alarmed "alarm 28: pump pressure not detected".This alarm occurred with user facility personnel which subsequently dispatched the steris service technician to inspect the unit.The technician reset the cb1 breaker and ran another test cycle.During the drying phase of the test cycle, the c4 contactor got stuck in the closed position.The c4 contactor being stuck in the closed position allowed a continuous electrical current to feed, and eventually overheat, the unit's heating elements.Failure of the contactor to move from a closed to an open position is indicative of a mechanical failure of the component caused by arching inside of the washer sufficient to weld the contactor into the closed position.The washer was removed from service and is pending repairs.A follow-up report will be submitted once repairs are completed.
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