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On a standing pilot furnace, when the burner fires it burns improperly. Seems like to high gas pressure, and blows out burner, and pilot. Tried to remove burner oriface, but does'nt seem to come loose. Oriface looks clean. Should i remove the oriface with a small pipe wrench(might do damage)or does this sound like a cacoon or something in oriface?

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That really is one you should have a pro look at.Impropper combustion can lead to carbonmonoxide.

Posted on Aug 26, 2008

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Why would the flame and pilot keep going out changed the thermocoupler


Remove the cover over the burners so an inspection of the heat exchanger is a bit easier. Take an LED flashlight and a small telescoping mirror and inspect the heat exchangers front section above the burners giving special attention to the two sections of the chamber on either side of the pilot light. Many times there will be a hole in the chamber or a crack that will allow the blower that circulates the air into the duct blow out the pilot light.

If you are handy enough, consider turning off the gas and remove the ribbon burners prior to performing your inspection. The pilot assembly is probably attached to one of the burners. Lay them on the floor in the order in which they install in the furnace as some furnaces have dedicated left and right end burners and most older standing pilot furnaces have the one burner with the pilot mounting bracket.

To remove, many times you gently pull backwards towards the gas manifold while raising up on the front of the burners. Once elevated enough, the burner then slips off the brass spud (orifice) and forward and out.

The next reason the pilot can go out is because the safety 'holding' coil in the gas valve is defective. Its responsibility is to hold open electrically a safety circuit proving the pilot gas is burning so that main gas can flow. The thermocouple generates just enough electricity to hold the safety coil open. Coil bad = pilot out.

If your furnace is over 25 years old, there is a good chance there is a hole or crack.

Feb 19, 2015 | Dayton Gas Furnace Heater

2 Answers

I have a Dayton hanging gas (propane) heater 3E838 series 1067A model z21116 when the heater ignites its like to much gas and blow out the side vents ????


sounds like the air to gas setting is wrong, not enough air intake. there should be an air adjuster near the burn box. where the gas goes into the burn box. fallow the gas line to find it. adjust it till it burns correct. there also should be a gas pressure adjuster to, it should be near the burner.

Dec 26, 2014 | Dayton Gas Furnace Heater

1 Answer

Light pilot reset


If yours is a high-efficiency furnace, you should hear the stack blower start running when your thermostat calls for heat. Next, the igniter should start to glow and remain glowing until the thermocouple opens the gas valve and allows gas to flow to the main burner. The main burner lights and burns until sufficient heat is generated for the main blower to turn on and blow warm air through your house. If any action does not occur in the order described, repairs are in order.

Dec 08, 2013 | Kitchen Appliances - Others

1 Answer

Why heater coils glow?


It sounds like you're describing one of two things. The hot surface ignitor in a gas-fired furnace, or the resistive heat strips in an electric furnace.

The hot surface ignitor in a gas-fired furnace lights the burners. This ignitor in modern furnaces serves the same purpose as the standing pilot flame did in older furnaces. It provides the required heat to ignite the gas at the burners. Without an ignition source, a gas-fired furnace cannot provide heat. When the ignitor is activated it will glow bright orange or yellow.

The resistive heat strips in an electric furnace actually provide the heat to a home or building. When the furnace turns on, the heat strips are activated and usually glow orange when they reach peak temperature. In almost all cases, the heat strips are not easily seen or accessed without removing covers or panels inside the furnace.

Feb 28, 2011 | Heating & Cooling

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Furnace seems loud when burners ignite like a small "woof" didnt always do that seems to be something new. Checked all venting nothing obstructed. Had gas presure checked it is LP input is 10...


Depending on the age of the unit the gas pressures should be fine. The first thing I would do is to give the burners a thorough cleaning and make sure pilot is clean if so equipped. I would shut furnace off and remove the burners for easier and better cleaning. Use a wire brush to lightly clean openings on the burners,and gently tap inlet end of burners on soft wood block or thick cardboard pad to clean soot and rust from inside the burners. Also blow out with air if you can.
I always do one burner at a time and put them back in the order they were removed in. When you get everything back together and furnace lit then you can loosen retaing screws on air baffles if needed to get the best looking cleanest flame possible.Flames should be tight on the top of the burners with nice blue flame with sharparrow points with just a little yellow on the very tip.
I hope this helps you. Thank you

Jan 10, 2011 | Heating & Cooling

1 Answer

Heater doesn't come on?


The electronic ignition system in a gas furnace is a modern development that allows more reliable performance than standing pilot furnaces, provides energy savings and contributes to better furnace efficiency (AFUE). With a standing pilot, found most commonly on older low efficiency furnaces (55% to 65% AFUE is not uncommon), a small gas flame is always burning and is known in the lexicon of American home repair as a "pilot light". The problem with this type of "analog" ignition is that it wastes energy by constantly burning gas and can sometimes be unreliable. These issues have led to the development of electronic ignition systems for mid to high efficiency furnaces that exceed the U.S. government's established minimum AFUE rating of 78%. The electronic ignition occurs typically in one of two ways:
  • Intermittent Pilot, or
  • Hot Surface Ignition The intermittent pilot system uses an electronically controlled high voltage electrical spark to ignite the gas pilot and then subsequently the main burners, when the thermostat calls for heat.
    The hot surface ignition system uses an electronically controlled resistance heating element not unlike a light bulb filament (and shown in the photo above), to ignite the gas burner.
    It is important to understand some of the other components of a modern furnace that you will encounter depending on the type of high efficiency furnace you have. Why? Because they can also come into play in repairing an electronic ignition furnace when it won't run properly. Let's take a quick review of the types of furnace designs and components found in high efficiency furnaces using electronic ignition.
  • Nov 14, 2010 | Goodman GMS90703BXA Heater

    1 Answer

    Furnace pilot problem


    check the pilot gas pressure, might be too weak and blowing out when the blower starts, the clicking noise is the gas valve shutting down when it detecks no pilot flame, that park is normal.

    Jan 10, 2009 | Honeywell Power Humidifier: Furnace...

    1 Answer

    Gas boiler won't stay lit!


    The burners and pilot need to be cleaned.
    Turn off gas and power, remove the burners and pilot. Clean with a brass wire brush. (Steel wire can be used but very carefully) Remove all rust dirt etc. reinstall and it should fire right up.

    Dec 28, 2008 | Ruud UBHC Air Conditioner

    1 Answer

    On a standing pilot, coleman gas furnace, when burner fires, the flame burns wildly on high burn. Could this be because the air adjusment is set incorrectly? In a short time it blows out the burner, and...


    HEY J, this could be a dangerous situation. You could have a crack or rusted out heat exchanger, if this unit is over 20 years old, which it is because it a standing pilot, units are obsolite! This could be letting in CO2 ( carbondioxides-- poision gas fumes) n, Oklahoma, our gas co. will come out for free to give our units a CO2 gas fume check anaylsis. Check this out before someone dies or ill repairable damage done to the body! Thank-you-very-much!

    Aug 30, 2008 | Coleman Heating & Cooling

    3 Answers

    Pitco Fryer


    Sounds like the burners are dirty remove burners and run under cold water and replace propane gas burns dirty and might have blocked up burners creating a pop at the burners this will then blow out pilot light if this does not work give me a shout

    Jul 27, 2007 | Pitco Frialator SG18S Deep Fryer

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