My Co2 bottle is in the Hydro shop and I was disapointed that the heat sensor wouldnt fire. Thanks to the people around here, I learned that the fittings might be loose. I tightend a couple of them, then went to the place where it connects to the main firing Mechanism. Hey, it was loose. I put 1/2 - 3/4 turn on the nut. I then cranked up the blow dryer, held it close to the sensor and within 15 secounds, CLICK !! I heard it fire. Now I'm ready to put the bottle back in and get it certified. Thanks for everyones help.