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Pilot won't light

The pilot will not light. Theres gas to the valve and coming out. I cleaned the whole burner assembly and blew the pilot line out but the pilot still will not light. I've also put a new thermo coupler on. what could the problem be?

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There is a remote possibility that the replacement thermocouple is defective.

Posted on Nov 17, 2013

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My Kozy World nat gas wall heater has worked beautifully for the past three winters. I cleaned it this morning with canned air, got all the dust off the ceramic plates, blew out the burner inlets, blew out...


Does the pilot light stay lit if you continually depress the control valve?
If the pilot light stays lit as long as you keep the valve depressed, then the problem is the thermocouple is bad. The pilot light makes enough electricity via the thermocouple to hold open the gas valve that feeds the burners. If the thermocouple fails to produce that electricity, the gas valve will shut down and switch off the gas flow to the whole unit.

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U can light the pilot lite,turn 2 ON it will stay lit 4 a couple of minutes then go out? If u turn the knob 2 low,med. It goes out pretty much immediately?I changed the thermocouple,blew the lines ou


Is the thermocouple secure, routed properly, no kinks, no sharp bends? Is the end of the unit properly aligned so the hottest part of the pilot flame is hitting the unit. Did you hold pilot switch in the light position for at least 30 seconds, before you set the gas valve to on? If all above OK, try this. Light the pilot using barbeque lighter once it lights keep the lighter on the t-couple for 30 seconds, then set the valve to ON and keep the lighter where it is. Once the main burner lights, remove the lighter. If the burner and pilot go off, your gas valve is bad.

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Did you clean the pilot orfice?? It has a very small opening about the size of a hair. You may have to use a needle to open the opening....Are you getting gas to the pilot orfice assembly from the Gas Valve when you set it to Pilot?? If not then check the pilot adjustment screw on top of the gas valve at the pilot tube. CW decreases flow.

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I can light the pilot and the burner will come on, but it won't stay lit. I bought a new pilot assembly and installed it. the burner and the pilot light still won't stay lit. This is the unit that...


Most gas water heater problems can be solved by having service technician perform yearly maintenance. Or by doing maintenance yourself.
This maintenance includes cleaning burner parts and combustion chamber, checking gas pressure and supply, bleeding air out of gas line, checking vent draft, making sure air supply is adequate and not exposed to chemicals, cleaning air intake. Also adjusting flame sensor so it is positioned correctly. If water heater is connected to electric circuit, the outlet must have correct polarity.

You can get gas to appliance indicates the gas control valve and water heater are not locked out. But the gas control valve thermostat can still be bad.

Open following link for illustrations, typical service manuals, and maintenance information, and images of gas control valve thermostats.
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I would trace gas line out and determine were you are getting gas and where it is not. With the gas on I would carefully loosen union or flex fitting going to gas valve.If you have gas there then retighten union and go to fitting on pilot line and check it.You should be able to get gas there by depressing pilot light button.If you have gas there then go to pilot assembly and remove it from gas valve and burner. Remove pilot orifice and carefully clean and blow thru pilot line to make sure it is not obstructed.
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Pilot assembly is located inside the bottom compartment, between the the two middle burners while the gas valve is located under the burner manifold. Make sure that the gas line where the unit is connected is open. You need to turn the gas valve knob to "Pilot" position and depress it (to allow the gas to flow on pilot) then light the pilot assembly using a lighter with extended nozzle ( burner igniter). Once the flame is present at the pilot assembly, wait for about 15 seconds (allowing thermopile to heat up) the gradually release the gas valve knob. If the pilot flame is stable, turn the gas valve knob to "ON" position and set the thermostat to desired temperature setting. This will ignite the burners and heat up the oil to set temperature. Just remember, do not do this if there is no oil on fry tank.

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Is this the newer style with closed combustion chamber. If so I would check to make sure that spark ignitor is working. If not it will need replaced. If ignitor is workingthen loosen compression nut on line to pilot and temporarily depress button on gas valve to make sure you have gas at that point.If you have gas there and tighten compression nut to pilot back up and it still won't light then you will need to remove screws that hold cover on burner compartment.Shut off valve to gas supply and remove gas line from gas valve remove pilot and thermocouple lines. Slide burner out ofcompartment and clean it .Remove nut from bottom of pilot assembly and clean out pilot orifice. Blow through pilot line to make sure it's all clear
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How do I change the termocouple on an older Dayton furnace


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