H400 heater 24v gas valve supply

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coryp

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Nov 6, 2007
54
Hello, been a couple years recently trouble free but having problems again with my hayward h400 heater. The blower is perpetually cycling with no gas (no valve click and no 24vac signals while my ps8 controller is trying to start it up) my control board is getting 24v, but the orange and white don't seem to excite even though I hear some of the control board relays clicking.

Is there another sensor that has go give the board approval before it send the 24v out to the valve, or do I have to run this volt check in some other manual mode?

A few years ago I had the spider web in the gas valve issue where it would fail after 3 tries and give error, but this id different and will keep kicking on the blower for a second and retry in 5 or so seconds indefinitely. No gas smell, no valve click.

Any suggestions would be appreciated.

Cory
 

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All of the limit switches need to be closed and the blower vacuum switch needs to be closed for the board to give 24V to the gas valve.

Is the ignitor heating?
 
ajw22 said:
All of the limit switches need to be closed and the blower vacuum switch needs to be closed for the board to give 24V to the gas valve.

Is the ignitor heating?
Click to expand...
Yeah, I didn't look for the glow, but even the external part was smoking hot. Are the vac switch(es) one or both of the large diaphragm pots up above the boards?
 
Last edited:
The limit switches are shown in the middle of the wiring diagram…

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Well, I wish It wouldn't have gone down this way, but we are temporarily resolved. I am pretty sure that all the limit switches in the water pressure circuit have been working. i did inadvertently set ofoff A0 error when I was playing with the blower pressure switch, I think by having it jumped while it was not running? After a power cycle on the heater to settle that code, it cycled 3 time and then lit, and has been working since. For now, I am assuming perhaps something in the blower switch or contact, or it just randomly blew something out in the pressure measurement line. I will have to wait till it fails again to retest.

That's for your support
 
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