I have this hayward heater and it will not stay lit. It fires up for about 8 sec and then goes off, cycles again, fires up and goes off. The good thing is that it does at least light up. I have cleaned every piece on it down to the burners, blown gas pipe/valve out, jumpered every switch and it still goes out. I am wondering if the gas pressure is too low? Has worked great the last 3 years until now. Any ideas out there for me before i call it quits?