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Is there a flame sensor on this unit that sticks into flame to verify burners are on?
I understand. They used separate flame rod on some and igniter s the senser on other.Does the flame actually ever come on? And if not do you have a volt meter to see if we are getting power to the gas valve?
Did you get an error code when it shut down?
Try again and as soon as it fails look for a code.
Do you have a red light?Here is what my manual shows for sequence of operation and troubleshooting codes.
Did you see my question about the red light on ignition control and if so do you have one and does it give us a code?
That might help
So is it running with thermostat bypassed?
Can you just for attest bypass the pressure switch and then limit to see if it will stay running?