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Check spark electrode is clean and in the right postion , check flame sencer is clean . check pressure switch hose are not split , jump out pressure switch see if it lights. you could also check over heat try jumping that out see if it lights , pilot may need cleaning if standing pilot.
Find where the gas line connects to the gas valve on the back of the heater, from the gas valve, follow a small aluminum tube going into the back of the heater. There may be a removable door to access the pilot assembly. If there is no aluminum tube, the unit has electronic ignition and no pilot lite. Turn the gas knob to off, then to pilot. Hold the gas valve in and with a long match or gas grill lighter, light the pilot. Continue to hold the knob in for about 30 seconds. After that, release the knob and check to make sure the pilot stays lit. If so, rotate the knob to ON. The thermostat will kick the burners on.
Sounds like a bad fan switch. The switch is located on the heat exchanger and is 110 volt bi-metal switch. Follow the wires from the blower going back to the heatexchanger. Graingers can get you a new switch if you give them your model number. www.grainger.com.
Hi the thermocouple is a long copper wire that goes back to the gas valve from the pilot .
i would clean the flame senser first , then check the pressure switch jump this out , then check the fan control or snap disc jump this out see if it runs if you need A THERMOCOUPLE then honeywell universal will do
Pilot lighted furnaces have a thermocouple made from disasimilar metals that when heated create electricity to actuate a relay that alows the gas to flow to the furnace.
When the thermocouple gets coated with carbon from the pilot lights constant burning it acts as an insulator and keeps the thermocouple from getting enough heat to generate electricity, a very good safety factor.
What you have to do is locate the thermocouple it should be located over the pilot light, you will see a gray substance around the thermocouple it will be hard like cement, take a knife and scrape away as much of the gray material as possible then sand the themocouple with a medium sandpaper until it shines, use one of you wifes emery boards, this should solve your problem.
Does the main blower fan kick on? Also, if the heater is vented outside via a flue pipe, there may be a small (about 3 or 4 inches in diameter) vent fan that kicks on to ensure the exhaust fumes are evacuated through the flue pipe. If there's a problem with that fan, the burner won't light either.