A user facility employee started a washing cycle and left the room.Upon return, the employee stated the load door was open and the fan blower was running.The washer did not display an alarm at the time of the reported event.No injuries were reported.User facility personnel attempted to close the door with the display board but it would not respond.Shortly after, the load and unload doors, opened and closed several times without being instructed to do so.A steris service technician arrived on-site, inspected the unit, but was unable to duplicate the reported event.Although the technician was unable to duplicate the reported event, the technician replaced the control board and confirmed the unit to be operating according to specification.No additional issues have been reported.Prior to the reported event, the reliance 444 washer required service as the pure water rinse tank overheated.The rtd temperature sensor on the pure water rinse tank was replaced.The pure water rinse tank is contained within the reliance 444 washer.If the tank overheats, it can cause the temperature within the unit to raise and push steam out of the top cover of the tank.This can cause condensation inside the stainless steel box which holds the control board, which can lead to the control board short circuiting due to the excess steam.
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