I have a 3 year old Hayward H400IDL pool heater. The mainboard was replaced 6 months ago due to ignition failure.
I now have a new problem. The heater ignites and stays lit for up to 1 min then flutters for 15 to 30 seconds and shuts off. It then repeats the ignition sequence and does it all over again. I never get a error code.
here is a video with audio I took of it happening.
any suggestions on what I need to do to fix this or part to replace would be appreciated.