hey guys. So bought a Hayward Pool Heater (Item# H400FDN) from Inyo in April, 2019. Everything was working great when installed, but this was in the summer. Ran it a couple of times for the kids, while I tried to make sure I understand it's operation, but that was it. Now it's cold enough here in Louisiana to use it and I be damned the heater will not work. Same problem as my old heater and the main reason I replaced it. It fires up, runs for about 5-10 seconds blowing heat out the exhaust, and then turns off, cycles the fan, and restarts. This goes on for 3-4 cycles and then throws an error, of IF. The filter was cleaned last month, which I clean every 3-4 months, but I plan to check it again tonight. There are no leaves or debris blocking the exhaust, and I've verified my water chemistry.
What now?