So I opened up our Jandy Legacy LRZ 399,000 to replace the insulation panels. While doing so I disconnected the unit to make examining the heat exchange easier. Once done trying to turn on the heat threw FAULT-CHECK IGN CONTROL. Now this happens now and then since I bought the unit. The company said it was my gas pressure. Well tonight the gas co measured 7 WC at the appliance. According to the spec 5.5 to 10 is the range. He mentioned it short cycled, which is what I've noticed in the past. It heat the element , maybe 5 10 seconds later you can hear the gas supply switch turn on . The sound of flames igniting occurs and instantly the gas supply switch turns off. While this happend once and a while in the past and would recover now it does not. The pump pressure is steady, the heater is installed in a well ventilated area... I'm at a loss. Any ideas , I'm running out of things to try and we close up soon, would be nice to have heat next summer.