Do-It-Yourself Story

Replaced almost all sensors due to age and a lack of test values. Worked for about a week and stopped heating again. Disassemble again and noticed the plastic stem that adjusts gas flow was backed out on the gas valve. Tightened the lock nut but that was fixed to the stem. Found the blower thermostat was open. Replaced the thermostat again and everything works. Reasoning is that too much gas flow caused an overheat.