Dayton 3e228 thermocouple replace - Dayton Heating & Cooling

Check your igniter. It could be burnt out.

The pilot assembly may need cleaned out and the orifice cleaned, also the gas valve may need to be replaced, to check for proper voltage from the thermocouple you need a flame source and it takes a meter that can register DC milliamps, and should be 350 to 750 millivolts. Heat the thermocouple with the pilot or other flame source and check, if OK, gas valve is weak.

chech the flame sensor or thermocouple which ever it is equipt with. Sensors can be cleaned by lightly sanding them and therocoulpe's need to be replaced.

Check the high and low snap disk and check wall thermostat if fitted.

clean pilot and change thermocouple see if this works

try cleaning the thermocouple or even replacing it because if the thermocoulple doens't sense the pilot light then it won't open the gas valve.

not hard but before replacing check pilot light and thermocouple for proper function and setting if pilot light not in right position thermocouple wont open gas valve if electronic ignition check for power and proper gap on igniter also check stat for proper function

The thermocouple is likely defective...(Copper wire heated by the pilot) or the pilot itself is too small or dirty....the pilot must be BLUE , not yellow like a candle...and it must envelop the top portion of the thermocouple....you could also have an auxiliary limit or ECO wired in series with the thermocouple circuit that could be open.....also make sure the thermocouple is inserted all the way and is in the pilot flame as mentioned above

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.

Normally you turn the gas valve to the pilot position, light the pilot, hold down the gas valve knob for 30-40 seconds and release. If the pilot will not stay lit replace the thermocouple. These are available ay Home Depot.

Ray