I installed a new jandy jxi 400 and the heater wont stay on. It fires on for about 2 seconds then goes out. At first we thought the meter wasn't big enough so we had the size increase. That didn't work. The gas line was on the was on boarder of recommended size of 1" for a short run so today we had a new line install (1.5") and still had the sames results. My question is before i dump anymore money into have a pool guy come out does anyone have any recommendations. It is a very short run only 30 feet. The plumber did check the pressure at the heater on the old line and new line and there was only about 3.5wc could this really be the problem and do i need to call the gas company back out. Thanks for any help very frustrated right now.