Question about Honeywell L4064B2236 Fan/Limit Control Heater

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Pilot light will not light

The pre igniter fan blows constantly but ignition to pilot light does not light the flame. The furnace is 20 years old.

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  • Anonymous Mar 16, 2014

    Just replaced the HS Igniter, now theres a loud pop/bang when the furnace starts. theres a red blinking light from deluxe Blend-Air II 7681-8171/B. Fan not turning on roof.

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Sounds like you may need a new electronic control module. This is a rectangular shaped plastic box that has wires coming out of it. This is what tells the pilot to light on these older furnaces.

Posted on Jan 28, 2009

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Old anthes gas furnace with pilot light. burners will not light.blows cold air


Have to think that the thermocouple has failed if the pilot is on but the furnace main burner doesn't ignite

Apr 05, 2014 | Cozy (W352E) Heater

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The furnace control on a York furnace is locking out due to unable to ignite flame


possibilities are many, no spark due to ng ignitor, if draft induced , fan not coing on or has blocked flue, if unit is condensing type might have condensate in drian line, if standing pilot type thermo couple bad so not sensing pilot. so you see not enough info of what type unit you have to help narrow down possibilities

Nov 12, 2013 | Heaters

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Dayton gas furnace model 3e385 works and lights but as soon as fan comes on the unit shuts off and lights again wondering what was wrong


Check heat exchanger for cracks or holes which will cause the fan to blow out the flames. The flame sensor on the pilot or burners has to be in constant contact with flame to operate normally. If the flame is put out by a cracked exchanger the exchanger or furnace needs to be replaced.

Nov 22, 2011 | Dayton Gas Furnace Heater

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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:
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  • 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

    2 Answers

    My heater blows cold air. any ideas?


    Your unit has a diagnostic light on the circuit board. You need to look thru a small viewing port to see it. Once you count the number of b links, remove the lower panel and look at the wiring diagram for an error code chart. Then read the following to give you some ideas what to do.

    On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

    What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

    Dec 01, 2009 | Goodman GMS90703BXA Heater

    1 Answer

    Burnham Boiler, no constant ignition.


    Is there a pressure switch you can jump to see if it is defective? Is the inducer fan blowing out exhaust? You could also have a dirty pilot.

    Dec 01, 2009 | Heaters

    1 Answer

    COLEMAN FURNACE BURNER NOT LIGHTING


    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.

    Let us know the results ... post a comment or "RATE" this or another expert's solution.

    Sep 16, 2009 | Coleman Propane Forced Air Heater...

    1 Answer

    Coleman Presidential II mobile home furnace. When burner lights the blower cycles on and off instead of blowing constant through burner cycle.


    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.

    Jan 17, 2009 | Coleman Propane Forced Air Heater...

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    Blower works but no heat


    If in fact you have the above listed furnace, you do not have a pilot but electronic ignition. You will need to remove the front cover on the furnace, tape down the door safety switch and then have someone help you by turning up your thermostat to a very high setting. Watch and listen inside the furnace. There should be some blinking going on at the control board followed by a small blower fan starting up. Then after 10-15 seconds there should be a click followed by an orange glow viewed thru the viewing window to the burner section. In a few seconds the gas valve should click and the burners will ignite. There is a safety switch that will sense flame and then keep the gas going to the burners. If it does not sense it, it will shut it off within 10 seconds. If all is well so far, your blower will turn on in about 90 seconds after flame. There is a diagnostic code chart on the back side of the access door if you get an error code (blinking) on the control board.

    Always check little things like air filter, condensate drain and broken or loose wires.

    Nov 05, 2008 | Goodman GMS90703BXA Heater

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