predetermined temperature such as 41 u00b0 f 5 u00b0 c the length of this grace period is determined by the state of the door switch at the time the reset button is pressed a if the door is open at the time of reset the controller will allow a first grace period for example a 60 minute grace period b if the door is closed the controller will allow a second grace period such as a 30 minute grace period c if at the end of the applicable grace period for example 30 or 60 minutes the temperature is not below the predetermined temperature for example 41 u00b0 f 5 u00b0 c the controller will trigger a health safety error and signal the solenoid 34 to lock the door and signal the display and or diagnostic led to indicate a health safety error 4 the health safety controller 18 constantly monitors the cabinet temperature after the initial grace period has expired the controller will assume normal operation and watch for an unexpected rise in temperature a if the temperature is observed to rise above a predetermined temperature such as 41 u00b0 f 5 u00b0 c the health safety controller 18 will start a timer for a predetermined amount of time such as 15 minutes b if the temperature remains above the predetermined temperature for more than the predetermined timer length the health safety controller 18 will trigger a health safety error and signal the solenoid 34 to lock the door 13 c if within the predetermined timer period the temperature returns below the predetermined temperature no health safety error will occur 5 the health safety controller.