I have a H250IDL or an H400IDL hayward pool/spa heater. I haven't used the heater in a couple of years and tried to start it to use the hot tub the other day and it will not heat up. The front cover was taken off & we followed the instructions of turning the on/off button and we hear the "click" and the heater turns on for a short time but will not produce heat. We received the IF code which I understand is ignition failure however I'm not sure what the next step is. I'm not even sure where the pilot igniter is to clean it in case of debris. Can someone PLEASE help? Thank you