Jandy LXI 400 NATURAL GAS POOL HEATER - "ignition heater" Questions

I have a handy lite2 LJ175N and I keep getting FL4 error code but the hot surface ignitor works if I run power to it from an outlet. Maybe an open circuit at igniter? Direct power at igniter, does not

...heater does not have a failure in any of the safety circuits and wants to fire. It is just missing an ignition source or the gas you smell is not making it to the proper place to be ignited. Given ...

...light comes on, you are probably going to need to replace at best case your ignition, and at worst case, your entire pool heater. ...

The heater ignites then after a few seconds it shuts off then continues to ignite and shut off heater ignites then goes on and off stack flue sensor or ignitor

jandy lite 2 heater model lj325n - code fl4 - hot surface igniter problem- I tapped the gas valve and checked the fuse , still getting the same code. Igniter circuit is open. Check fuses on igniter ...

...so may want to check a flow issue THE IGNITION LOCKS OUT BECAUSE THE HEATER DID NOT FIRE MUST BE TRUOBLE SHOOT BY A PROFESSIONAL SINCE VERY HARD FOR ME TO TELL YOU WHAT IS MAKING THE HEATER NOT TO ...