You may have a roll-out switch triggered or a blown fuse on the circuit board. In the burner box, there will be a small round disk with two wires connected to it. It may have a small stem that sticks out between the two wires. Press in on the stem and feel if it clicks. Look for any other disks like this. Look at the fuse on the circuit board. Replace it if necessary. You can jump the roll out switch(s) to test them if you don't have a multimeter.