Pool and Spa
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Sounds like you may have a bad temperature limit. I'd try jumping them out one at a time to test. Do not operate the unit with a limit jumped out except for testing purposes.
It's in the inlet/outlet water manifold. Here's a link to your manual. Its location is shown on the parts blow up on page 8
I don't follow you description. Take a look at the wiring diagram on page 7
Since jumping out the air pressure didn't solve this then reconnect it. There's a red wire on each end of the limits string with a yellow wire between the 2 limits. If you connect the red wires on each end of the limit string you'll by pass both limits which will tell you if it's a limit problem. It just won't tell you which limit (diagram shows 2) is the culprit.
Well, I don't get the air mix solution. How are you supposed to adjust the air mix when the burners don't have an air shutter? The only other device on that circuit are the water pressure switch and the thermostat. You can try jumping those out. If nothing changes then check the voltage at the ignition module when it isn't working. If you have 120 volts at the control then the ignition control is suspect.
Thermostat wires are blue. Pressure switch looks like red & black.
I'm talking about the water pressure switch which is also on the water manifold. Again refer to the manual. Wiring diagram has a decent picture, parts blow up shows where it is. If none of this works you could have a bad ignition control but you need a voltmeter to test it
A phone call won't help since I've given you all the info you need here. I can't guarantee a fix all I can do is tell you what to check. And you need a voltmeter/mulit-meter to check the ignition control if none of this works.
I've outlined the procedure you should follow. My diagram shows a blue on one terminal and a blue & red on the other pressure switch terminal
You connect the 2 connectors on the pressure switch together to jump it out. There's no way you can know if the ignition control is good or not simply because the unit fires up. The control also keeps the burner lit.
It sounds like you bypassed all the devices in the control circuit. Double check the wiring diagram to see if you missed any. Once you get the meter then you need to check the voltage into and out of the control. If you have ~120 volts into and out of the control then check it at the gas valve if you also have 120 volts at the gas valve then you have a bad gas valve. Actually it would be easiest to start at the at valve first then check the control. Do this after it fires up then shuts down.
With the volt meter. If you have ~120 vac at the valve then the valve should be open and the burner should be firing.