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Hi Thanks you in advace for your help. I am a newbie with visilogic and I am struggling with the last subroutine of my program. I will explain what I want to happen: As HMI loads, O3 to automatically open until a set pressure is reached (103 mbar) O3 then closes and remains closed whilst a leak test is undertaken - if the pressure drops below 103 mbar during the test time, O3 should not re-open. As the set pressure is reached, a timer should be activated to start the leak test timer (10 seconds) At the end of the 10 seconds, if the pressure is below 100 mbar then HMI FAIL should load If the pressure is above 100 mbar then HMI PASS should load. When the program finishes, all timers shoudl be reset ready for the next run test. This is working ok the first time i run through the program, but when I restart the routine the timer is running before the set pressure is reached. I also cannot lockout the O3 control. Can anyone help?! I have attached screenshots of my ladder. Thanks Russ