Hello I am here to assist you.
What stays on for about 30 sec.? The burners or the Fan?
the burners for sure...not sure if fan stays on for 30 seconds
This may be a flame sensor issue.
The flame sensor rod is a small thin steel rod that is straight or L shaped and is usually located near the pilot igniter or in the path of the burner jets. Locate it, remove it, and clean it with a piece of emery cloth or sandpaper very good.
Please hit ACCEPT if you are satisfied with this answer. If not, I will continue to assist you. Bonuses and positive feedback are very much appreciated!
i cleaned it and that didn't help, i then rbought a new one and that didn't help
If you set the thermostat to the fan on position, do the fan come on?
fan doesn't come on
That is your problem, either you have a bad fan motor or a bad fan capacitor.
The fan capacitor is located on or near the blower motor housing and resembles a oversized battery.
It is usually silver or black. Locate it and replace it.
If this does not correct the problem, then you have a bad fan motor. If the fan motor is bad, you will have to buy a new fan capacitor anyway so you may as well change the fan capacitor first.
If the Fan motor is bad, you will have to hire a technician to change it out.
Please hit ACCEPT if you are satisfied with this answer.