I just aquired a machine it will make ice the 2 timers work as stated in the manual and the coil energizes on the hot gas valve There seems to be plenty of pressure on that side of the machine. exactly how do I check to see if the valve is working. also the harvest motor does enter the cycle and has plenty of pressure on the sheet of ice but of cource it just spinns on the clutch. so I think I have narrowed it down to the hot gas valve. any help?