jandy pool heater

I’m hoping someone here might have some good advise for figuring out why my pool heater is not heating the water. I have a Jandy JXi gas pool heater (similar to the one pictured). The heater turns on and fires up. The blower is working and there is heat coming from the exhaust (it’s acting...

I am helping a friend troubleshoot his pool heater (Jandy 400). His unit is getting a single flash LED light which indicates an air flow fault. After the unit shuts down the display indicates Fault- Check IGN Control. I checked the obvious signs like blockage (inlet and outlet). Put meter...