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Fedders gas furnace exhaust fan comes on but will not ignite

Green light blinks twice

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KD Grayson Heating,Air conditioning & Refrigeration

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The induced draft motor you describe has a pressure switch proves the induced draft motor is running, it is about 4 inches across and silver and flat and round, it has 2 wires and a tube that atttaches to the induced draft assembly onto a barbed port, this barbed port will obstruct with carbon and needs to be cleared annually with a tiny dril bit or similar device.

Posted on Jan 13, 2015

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Model gch90703bxab


There could be other problems but check and see if your igniter is not burnt out. Ours did that and tried to ignite for two days and then I found I had to change the igniter.

Dec 05, 2017 | Goodman Manufacturing Goodman GMH950704CX...

1 Answer

I have a Rheem Furance that has turned off. Just a few hours ago the main fan turned off. The Furnace doesnm't light even the draft fan does turn on and then the main fan blower motor turns on. I can hear...


You will need to reset the furnace by turning the power off to it. Then as the furnace tries to light, watch the LED for blinking. Hopefully it will give a code other than 1. Try checking the air filter for blockage, make sure all hoses are free of moisture and any drains are not blocked. Check the air intake and exhaust pipe for sags where water could block it.

The sequence of operation is this:
Thermostat calls for heat, the LED may blink telling you it registers the call. The inducer (exhaust) blower starts closing contacts in the pressure switch (small disc shaped thing), the igniter glows orange (seen thru a small window high up on furnace front), gas valve opens allowing main burner to light, flame travels to all other burners, flame rod senses flame within a few seconds and keeps gas on. Room air blower starts within 90 seconds.

Any deviation or delay in this sequence and it goes into lock-out.

Jan 22, 2011 | Heating & Cooling

1 Answer

Furnace was not coming on red light was blinking once now its working wondering what the one blink means cant find my manual


One blink does not tell you much, it tried 3 times to start and did not.

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).

Jan 10, 2010 | Goodman GMS90703BXA Heater

1 Answer

My furnace tries three times then red light blinks once


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).

Your furnace has a diagnostic chart on the reverse of the lower panel incorporated in the wiring diagram. One blink tells you that it is a failure but wont tell you where to start looking.

Nov 27, 2009 | Goodman GMS90703BXA Heater

2 Answers

Ruud furnace Model URKA A030jK08 Code opt 589


Flip the lower panel over and look for a wiring diagram. On that diagram there will be a diagnostic chart. Let me know what 5 blinks represent. Then I want you to read on.

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).

Nov 23, 2009 | Heating & Cooling

1 Answer

We have a dayton gas furnace model #3E463A. thought the control box was gone. got new one we furnace starts up the power goes on, fan starts no green pulsing light on control no ignition


When your furnace starts...the Ventor motor(exhaust fan) starts up....within a short time (seconds) the Pressure switch closes proving that the Fan is indeed running and the vent is not blocked...if this doesnt happen the furnace will not poweer the ignitor or fire at all....Check the vent pipe outside and look for obstructions or dirt on the screen inside the pipe...the condensate from the fuirnace may not be draining at all...due to plugged condensate drain lines...find this tube coming out of the furnace front...bottom of upper compartment usually , and pull it off the tap....if water starts coming out then your drain is plugged downstream of the furnace.

Oct 25, 2009 | Dayton Gas Furnace Heater

1 Answer

Main Fan won't turn off even with thermostat removed. Burner not


There is a chart with the wiring diagram and othere charts that will tell you what the 6 blinks are for. That should tell you what is wrong and what part you need. Sounds to me like the board has an issue or the gas valve is locked out.

Jan 10, 2009 | Goodman GDS81155CNA Open Flame Mid-Size...

2 Answers

My Carrier gas furnace (ser. 1903A41848) located in the attic, is five years old and suddenly won't light. IT cycles the fan when I cycle the power to the unit and seemingly attempts to ignite through 3...


try the fuse ,check the ignition element .do You have a drip leg on your gas supply line just before the gas pipe enters the furnace .if not your gas valve maybe folded .

Jan 04, 2009 | Heating & Cooling

1 Answer

Goodman GMS90904CXA Wont ignite, light blinks 3 times


Ok, you either have a inducer fan issue or a pressure switch issue or a plugged vent pipe. The inducer turns on to establish a draft for the exhaust. If it is not working you will get this error code. If the pressure switch does not sense pressure caused by the inducer, it will give this code. If either the intake pipe or exhaust pipe is blocked (even y just a little) it will give you the same error code. If the condensate hose or receptical is plugged, again it will give you this error code. Good Luck!

Oct 20, 2008 | Goodman GMS90703BXA Heater

2 Answers

Ruud Furnace won't turn on


Take of the access panel on the furnace and look for a wiring diagram either on the back of the panel or inside the housing. There will be a diagnostic chart on it that will give you a hint what 2 flashes mean. I think it is a "no Ignition" code. If it is, with the access panel off and the door switch taped in the closed position, the furnace will try to start if the thermostat is calling. You want to look at the control module to see if it is flashing, then you should notice a small fan that pushes out the combustion products start to turn. Then if you look in a small view port, you should see an orange glow followed by a clicking noise at the gas valve. Then you should notice a blue flame in the view port. This flame must stay on for 5-6 seconds or the unit will turn it self off. If one of these do not happen, you will need a technician to troubleshoot it. Check to see if all wires and hoses are tight and in place. Make sure your condensate hoses are not blocked and free of water. Make sure there is no blockage in your vent pipe(s). 

 

Let us know what you found. 

Oct 11, 2007 | Heating & Cooling

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