I had a new 80% 70,000 BTU heater installed. During start up, the burner would light and burn for 40 seconds. The flame would go out, the cycle would complete itself, and no blinks on the red indicator light (LED) on the circuit board. The book says that I either have a 115 volt, or 24-volt VDC problem, which we don't have, or the circuit board is bad. Is this a common problem or should I be looking for something else? Thank you. Ted
Turn electric off to heater, there should be a light switch on the side of the heater that cuts electric off to the heater. find the flame sensor, unplug wire to it and remove from heater being careful not to touch it with your hands or fingers, because of the oils in our skin. you can touch the part that the wire plugs to. when you get it out take fine emery cloth and clean the probe side or the sensor side real good and reinstall it. plug the wire back in and try heater. it should work fine. the sensors sole purpose is to detect flame and when it gets dirty with carbon it cant. so the sensor false reads and tells the heater its shooting raw gas into the heater and the heater shuts down, or short cycles, its there incase the ignighter fails. hope this helps you. it cost me 105.00 for this info. write it down in your owners manual so you dont forget it. the symptoms and the cure.
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The first thing I would do is make sure the flame sensor is clean, this is a metal rod immersed in the burner flame on the opposite side of the igniter. If too much oxidation builds up on it, it will not allow the burner to stay lit. To clean, just turn off furnace and remove flame sensor and clean with steel wool and then reinstall. If this does not solve the problem there may be a problem with the gas valve.
i would start by checking the flame sensor ...if the unit is actually firing off just not staying lit sounds like a faulty or dirty flame sensor.... if you look inside at burner assembly there will be a metal rod ranging from 1 1/2 to 4 inches in length.... it ia in burner assembly and has (1) wire that connects to it and usually one 1/4 inch screw on it.... remove this and lightly /let me emphasize lightly sand it and clean it ...to much will actually damage it...re-install and see if it helps... this senses the flame and tells the control board to keep gas valve open most likely your culprit....good luck to you...
Can you confirm that your gas pressure/ supply is correct-- by lighting all of the range top burners at the same time-- Do they all light quickly, and burn to full height, without much of any yellowing at the flame tips? That should indicate you have god gas pressure and supply.
Now-- in the Oven itself- When you light the BROIL burner-- does it's glow ignitor light up, and does that burner light off OK?
If it is only the main oven burner that is not lighting, are you able to remove the cover plate that covers it, and watch it light off? -- Any clues on whether or not the gas valve even open?
If NO gas flow, likely you need a new Main Oven Gas Valve-- Probably need to call your Gas Appliance service person.
dIf the burners are only staying on for about 5 seconds, you proably hav e a dirty flame sensor. Watch the burners light, the glow plug will light one end of the burners, in front of the last burner to light the will be a small thin rod, this rod must sense the flame or the gas will be shut down. Take a piece of steel wool and gently cleqan the rod.
There is a thermocouple "wire" that is supposed to be touching the pilot flame.
The thermocouple senses a flame (hot) and allows the heater to operate. If the thermocouple does not sense that the pilot is on, then it will not allow the furnace to operate.
Bend the thermocouple wire (or the pilot tube) so that the pilot flame is touchingg the thermocouple.
That shouls work now.
The air from the fan should not be blowing through the same cxavity that the pilot is in.
If it is, then you may have a leaking furnace whereby carbon monoxide may be seeping into your living quarters.
If the fix above works and the pilot stays on after the heater starts, then there is probably no leak.
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Is this furnace standing pilot or electronic? if standing pilot turn power off then take t-stat off wall and connect the wires labeled r and c together and see if that keeps furnace working. If electronic check flame sensor you can check flame sensor buy cleaning with steel wool. if that doesn't work then try t-sat.
The flame sensor is dirty. You can not see the build up on the sensor but enough build up will change the resistance and the furnace thinks there is no flame.
To clean the sensor, first you need to locate it. it will be a sensor located in the path of one of the flames. Once you locate the sensor, open the bottom panel to turn"off" the furnce. After the panel is removed, unscrew the sensor from the frame above the jets. Use a clean rag and gently wipe the sensor several times. Place back in the cut out and close the lower panel.
The furnace should cycle on and the flame stay on for the normal cycle.
Sounds like the flame sensor. But it could be the thermostat. Is the furnace standing pilot or electronic spark or hot surface ignition. I would start by checking thermostat. Turn power off to furnace take thermostat off wall and take wires marked r & w and connect them together. Turn power back on if furnace works then change out thermostat.Most eclectronic ignition Furnaces have a flam sensor, You could take flame sensor out and clean it up with steel wool or wire brush. If you need anymore help just reply back .
Is this furnace standing pilot or electronic ignition. If standing pilot i would check furnace filter then the thermastat. To test themostat first turn power off to furnace. Take thermostat off wall and take wires labled R & W and connect them together. If you have electronic ignition I would start with cleaning the flame sensor with steel wool or wire brush.If you have and more questions i will be glad to help.
Empire faw 40 makes a loud bang when starting up. There are three burners. The pilot light is on one burner. When the furnace starts, gas is lit on that burner and the flame is passed on to the other burners by a small channel that can get stopped up. You just have to remove the burners and clean the channel with a small file, like on a finger nail clipper. This can be difficult due to the pilot assemble being attached with two bolts. The bolt on the right has to be removed with a short screw driver. You can not get a socket on it. After you remove it there is enough play to remove the bracket and gas burners.