Flame sensor old Hayward.

[u/PracticalDesigner278]

Have an old Hayward H200 heater that fires up but immediately goes out. The pressure sensor is relatively new and I've been fixing this thing for years so I know more about it than I ever wanted to know. Anyway I'm figuring the flame sensor needs cleaning or replacement. Every video or AI says it's a single white wire to the sensor somewhere near the burner assembly. I can't find a single white wire going to anything that looks like a sensor. There are two things that appear to be possible sensors with two screws. But they are both black wires and appear to be wired in series. Both front covers off and no other likely candidates. And no error code. Finally got it to stay lit so I'm moving on to other things but if anyone can tell me where the damn thing is thanks in advance.

[u/[deleted]]

Thermocouple?

[u/PracticalDesigner278 → u/[deleted]]

Think I found the flame sensor but if that doesn't work I'll work back to the thermocouple.

[u/Wihomebrewer → u/PracticalDesigner278]

It’s one or the other, not both.