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An IF error on a Hayward heater means the heater is not lighting; or it has lit but the control board does not recognize the burners are lighting and after a few attempts has locked itself out. It will reset itself and try again after 60 minutes or after power is interrupted and switched back on.
I'd start with determining if the heater is in fact lighting the burners or not. If it is the flame sensor is not sending the signal back to the board indicating such and needs to be looked at. If it is not lighting then you'll need to look at the control board, the gas valve and gas pressure to see if it is an electrical issue with the board or valve or there is a gas pressure issue in the supply line.
Depending on what you find you may want to seek professional help or add a comment to this post for further assistance.
You can also refer to your owner's manual, found here.
If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!
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