Hayward H250FDN heater not igniting!

May 20, 2020
Hi Guys, I opened my pool for this season last week. Today, I tried to turn the heater on to get ready for the weekend but guess what, the heater did not turn on. I am getting an 'IF' error code on the panel. When I try to turn it on, I hear clicking sounds but I don't feel it is burning the gas. I checked and the gas valve is in on position.

What should I be checking next?