Ive been troubleshooting my spa heater for a few weeks now and im out of ideas, any assistance would be much appreciated. I have a hayward 400idl natural gas model. At first the unit would attempt to ignite 3 times then display ignitor failure IF, heat could be felt from the top for a few seconds and I could smell some gas fumes. I pulled the unit apart and when attempting to clean the igniter broke it, so I replaced that. Pulled all of the gas nozzles out to check for blockage and one had a spider web in it, cleaned and reinstalled. Fired the unit back up and it worked perfectly for about 5-10mins bringing the spa from 64 to 70degrees, as soon as it hit 70 the gas kicked off, attempted to reignite twice and again displayed IF. Any ideas out there?