I have a Jandy LRX125en, it looks like a flame sensor issue but need to confirm. The entire startup process appears to cycle fine. 1. Igniter comes on nice and bright. then you hear the Gas valve click...but the burner never lights up. The Igniter goes out, then the process cycles a few more times then I get ignition lockout (3 LED flashes) and message on LCD says Check IGN Control
SOURCE: Replaced control interface panel and
You'll need a manometer to check inlet and outlet gas pressure to confirm the valve is opening upon receiving voltage. Since you have replaced everything else you're likely to find that even though the 24V is present at the valve and the inlet pressure is fine you are not getting any manifold pressure - the valve is bad.
John
SOURCE: jandy legacy pool heater brand new igitor doesnt
check inside by power supply if wiring 120 volt need to separate wires with nut on them see inside of front panel for instructions
So, you replaced part R367100 (Igniter)? This part if very susceptible to failure if touched. I would inspect and/or run a continuity check to make sure it has non cracks. Does it glow red when you attempt to start the heater? Remember, that is the how it ignites the flame, by getting red hot.
If it glows red hot, but does not light then I'd do the following testing in between;
Check that the inline fuses on the igniter aren't blown,
Check if the control board is sending a charge,
Check the flame sensor for gunk build up. Unfortunately to replace the flame sensor look like you have to purchase a whole new burner assembly to get a new flame sensor.
I also believe there is a toggle switch on the front door. It may need to be depressed before the system will ignite.
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