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Flame sensor light blinking on my Frigidaire furnace

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The flame sensor is really a flame rectification circuit. Ground to the circuit board is actually conducted through the flame to the flame sensor (ground rod) completing the safety circuit. Sometimes oxidation forms on the surface of the flame sensor inhibiting its ability to conduct the flame but most of the time the problem is on the spade clip that attaches to the circuit board or to the bottom of the sensor itself. A simple removal and scratching/sanding/cleaning of the surfaces of all the ground connections in the sensor circuit usually take care of the issue.

Posted on Nov 23, 2014

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Posted on Jan 02, 2017

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mrgrzz
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SOURCE: Where is flame sensor on my old oil furnace?

Thanks for your question,
The flame sensor eye is located just under the transformer, it is looking straight down the burner assembly to where the burner chamber is at, you will have to remove the entire assembly to get to it, first make sure the power is off, remove the transformer, then remove the entire burner assembly from the furnace cabinet, once removed you can see the flame sensor window, use a clean oil free cloth to clean it, it would probably be a good idea while you have it out to replace the burner nozzle, as over time they will clog, I hope this helps you fix your oil burner, let us know and rate this please, thanks again,
mr.grzz

Posted on Jan 27, 2009

  • 3 Answers

SOURCE: flame rollout sensor keeps tripping

The flame rollout sensor is a rather important safety feature that ideally only trips when there's an overtemperture outside of the combustion chamber. I'd encourage you to get a better quality tech in ASAP to check for a cracked heat exchanger, gas overpressure, restricted airflow (changed the filter lately?), maybe a blocked condensate drain if this is a high efficiency furnace. If the sensor was replaced and it's still tripping, you've got a potentially dangerous overheating issue that you don't want to try to bypass.

Posted on Mar 20, 2009

  • 288 Answers

SOURCE: Goodman furnace burner ignites then shuts off in about 10 seconds

if you have replaced the flame sensor and it will not stay lit, the draft safety switch may be opening. It works on positive and negative pressure created by the inducer fan motor.You may have a restriction in your heat exchanger or if is a high efficiency furnace, it may not have the drain tube installed properly with a trap. The trap works just like the trap under your sink and if water isnt in the trap, the pressures can be effected enough to open the draft switch(some call it an air pressure switch)

Posted on Jan 07, 2010

Therinnaiguy
  • 1420 Answers

SOURCE: Goodman GMP Furnace problem. Original problem is

Good one! Is the flame getting to the flame sensor within the few seconds? Maybe a good cleaning of the burners or flame tray would help. 1.3 ma is enough for the flame rod to tell the board to stay on. Re-do all the ground connections both at the board and furnace cabinet to be safe. Check the polarity of the power going to the furnace. What are the chances the second board is bad?

Posted on Jan 15, 2010

  • 2557 Answers

SOURCE: Janitrol GMP124-5...furnace start up sequence ends

Hi try the pressure switch, clean the flame sensor

Posted on Feb 02, 2010

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1 Answer

I am getting 7 red light blinking on my goodman furnace. how to fix Flame Sense Microamp Signal Low ?


If its the flame sensor check connections to and from sensor.
Try cleaning sensor or replace sensor .

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Indicator blicks 3 times replaced combustion air switch but did not resolve problem. what do i do now?


There should be a diagnostic chart on the furnace door by the wiring schematic. If so see what the code reads for three blinks.
By the term "air combustion switch" I guess you are referring to the pressure switch. Most diagnostics blinking three times is just a dirty flame sensor. If this is the case the burners will light and go out within 4 seconds. If this is the problem carefully remove the flame sensor and clean gently with emery cloth, fine sandpaper or fine steel wool. Reinsert the sensor and enjoy your heat.

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Burner ignites but shuts off 2 seconds later?red light blinks 7 times in a row?no heat.


If your pressure switch has ever been replaced, make sure that it was replaced with an OEM pressure switch, because it can cause some strange behavior on your furnace. Check out this video, as this is touched upon in it: Amazon Furnace Parts: http://www.amazon.com/s/?_encoding=UTF8&camp=1789&creative=390957&field-keywords=gas%20furnace%20parts&linkCode=ur2&tag=amznelite-20

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1 Answer

I have a goodman propane furnace, model # GMPN080-4 that lights for about five seconds and then cuts off. It does this three times and then stops all together. Tried lightly sanding the flame sensor and it...


The goodman furnace will try and light three time before it faults out for safety reasons. Adjust the flame sensor so that it is closer to the flame or actually in the pilot flame. If the flame sensor is inside the pilot flame and still does not stay lit, your flame sensor is probably defective and should be replaced. You can get one at Ferguson's counter sales.

Dec 12, 2010 | Heating & Cooling

2 Answers

I have a York Diamond 90 furnace and when i try to start it, the pilot light goes on then it shoots the flame into the furance, but will shut down a minute or so after that. It sounds like the blower is...


The furnace is not sensing the flame. Turn off the power.
There is a metal rod in front of the last burner to light. It is corroded and needs to be cleaned. Its the flame sensor .
take the 1 screw out holding it in to the bar and scrub it with some steel wool till shiny. replace and turn on furnace. all should be fine.

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1 Answer

Amana Air Command 80 SSE gas furnace will not stay running


In the path of the flame on the last burner that starts, there will be a small rod. That rod is the flame sensor. Take a scrub pad and polish it. Also check the electrical connection that goes back to the circuit board. Disconnect any ground wire from the circuit board to furnace cabinet, sand it and replace it.

Mar 14, 2010 | Heating & Cooling

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

1 Answer

My burner goes on but shuts off early and blows cold air. it is a goodman furnace. where should i start to solve this problem. i just had furnace cleaned and flame sensor cleaned. should i buy a new flame...


First when it goes out again, locate the furnace and look thru a small viewing port to see if there is a light blinking, count the number of blinks. Then look at the wiring diagram for a diagnostic code chart. This will give you a strart of where to look.

Oct 17, 2009 | Goodman Heating & Cooling

1 Answer

Furnace shut off after 3 time flame from pilot


Sounds like you may have a weak or bad flame sensor. If the circuit board does not sense a good flame it will not light the burners. Also if your furnace is 5 yrs or newer it should give you a fault on circuit board in the form of a blinking or a code itself.

Feb 15, 2009 | Goodman GMS90703BXA Heater

1 Answer

BLINKING LIGHTS ON fURNACE


had same problem, first you need to find the location of ignitor double black wires from plug on board and flame sensor.single red wire. 4 red flashes means ground fault, I removed ignitor, cleaned with some scothchbrite, cleaned around screw holes(2) to reestablish ground, I even ran a wire from one of the mounting screws to a ground elsewhere. then I went on to the flame sensor witch will give you flashing yellow light. single red wire to sensor that has one screw holding in. Remove sensor carefully and do the same as the ignitor, clean with scothbrite. I did this a year ago and is still going!

Jan 21, 2008 | Dishwashers

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