Bad news - this solution did not help at all. The timer just goes on on itself and I know that it is not false trigering of the gate because it's not pulled down with resistance. The way i know is because I see the indicating LEDs going on like crazy without any input. I am totally lost now ...
I haven't bypassed it but I doubt that this is going to solve the problem. In fact I wonder if the timers are faulty at all. Any of those boards is perfectly working out of the machine that they are made for. Once put in the machine the first timer (the one that is on the lower part of the sheet) which works in "interval-on" configuration starts getting all crazy. Now, the only thing that I am suspecting is a problem with long wires. If you see on the schematic there are 2 nets with labels POT 1 and POT 2. One is in fact the positive terminal of the DC PSU while the other goes stright in the RC timing circuit (actually the potentiometer is part of it as you can see). You cannot see the potentiometer because it is not on the PCB but on face panel where we can adjust timing from 1 to 10s. Since the wires are sort of long (little less than a meter each terminal) I believe that this is very good noise source stright in the timing circuit... and thus the main problem. Now, my question is what are you thinking about this guess of mine, and if the guess is correct how can I fix the situation besides using short wires (since this is obvious way ;D). Thanks for all replies so far 
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