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My furnace blows cold air the yellow led flashes indicating weak flame but the flame seems big enough to me I'm stumped.

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  • 155 Answers

Check your gas pressure

Posted on Nov 14, 2014

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6ya6ya
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Posted on Jan 02, 2017

SOURCE: Frigidaire furnace model # FG6RA 096C 16B

Check your intake pipe for obstruction.

Posted on Mar 18, 2008

aries_67
  • 1 Answer

SOURCE: 1993 goodman status light 4 times blinking

I have a goodman GMP075-3 that won't turn on. I think it is the pressure switch since I do not have a vent blockage. What is a venter and where can I find it??

Posted on Dec 30, 2008

  • 252 Answers

SOURCE: my fridgidaire gas furnace is blowing cold air

Today’s furnaces are controlled by a computer which constantly monitors for problems. When it detects a problem it will shut off the burners. Depending on the problem and the specific furnace it will either “lock out” the furnace or cycle it through a purge (to rid it of un-burned gas and excess heat) and then attempt to re-start it. If the problem continues to occur then it will “lock out”. Depending on the problem and the furnace it may again attempt a re-start after several hours. In any case if the problem was not detected/caused by a sensor which requires a manual re-set, when the power to the computer is interrupted or the call for heat is interrupted the computer is reset and it will again attempt to re-start the furnace. The most common problems are:
· Low or lack of flame sense. Different furnaces use different methods to detect a flame – often these “flame sensors” become dirty and have to be cleaned (usually with sandpaper or steel wool).
· Bad igniter. (Doesn’t light at all).
· Clogged combustion air intake or exhaust.
· Clogged condensate drain. (90+% efficient furnaces).
This is not a complete list, only the most common!
Depending on where you live your HVAC system runs more than anything else you own (including your car). All furnace manufacturers “recommend” “regular maintenance” of your furnace. In fact, all that I am aware of state in their warranty that the warranty may be voided due to lack of “regular maintenance.” The industry has defined “regular maintenance” as yearly (in fact, some manufacturer’s warranties state yearly). Due to safety, liability, and the need for many other things to be checked, cleaned, and/or adjusted (2-page checklist where I work) to ensure safety and efficiency. Due to the large number of furnaces and the differences between them. Moreover, due to the terms of this site, I WILL NOT AND CAN NOT give you specific instructions on how to perform repairs on your furnace. I suggest that you contact a local, reputable, HVAC service company for (a tune up, preventive maintenance, general maintenance, yearly service call, general service, or whatever they call it).

While I may not have told you how to fix your furnace yourself, I have told you how to fix it. Please rate my answer.

Posted on Mar 14, 2009

  • 118 Answers

SOURCE: Gas furnace is constantly blowing cold air

An indoor blower running when it is not supposed to usually indicates an overheat condition. I would guess that it has been cycling on and off for some time and finally caused the high limit to stick and not auto reset. if you tap it sometimes they reset. the real problem is that it has been overheating from lack of airflow, over sized unit, not enough return air, too many closed registers, dirty filter, dirty squirrel cage blower and or air conditioner a-coil. If you get it started again sit and watch the unit run the flames should come on and stay on for the entire heating cycle, not going on and off.
I wish I could help you more but it is difficult without seeing the problem myself. Good luck! this should get you started!

Posted on Nov 03, 2009

SOURCE: I have a york diamond 80 furnace. I just got home

99% of the time its either the induced draft pressure switch not closing, or staying closed, wavering, etc. due to condensate accumulating in the tube that senses the air pressure in the indiced draft housing that leads to the pressure switch that upon being closed poroves the induced draft motors running allowing a purge and a trial period for ignition, either spark type or hot surface ignitor type
if the hot surface ignitors not glowing or pilot assmbly isnt sparking, check the hi limits and safetys, by pass them and / or jumper the terminals on the circuit board simulating a good limit circuit.
the tube on the induced draft housing attaches to a orifice or nipple, that can and often do get carbon in them which is very tough to poke through, I use a papaer clip undone or small screwdivers shaft, it may feel as if you hit a solid wall but unless you hear the blades metallic clang or noise its carbon and needs to be pushed through and clear the orifice out, this needs to be done annually, the pilot asebly , pressure switch on induced draft and orifice are the big troublemakers i dont know your particular codes is the air filter clean?

Posted on Dec 27, 2010

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Error code= two red flashes, lockout/ no flame


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cause this fault. 2 RED FLASHES: This indicates that thenormally open pressure ... The furnace will lock out for one hour and then restart. 7 RED FLASHES: This fault code indicates that the flame could not be established. This no-light ... problem. Bothheating and cooling operations will be affected. Check

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1 Answer

Why does new furnance with propane conversion have yellow flames?


Make sure the kit included smaller sized orifice's and spring kit for the gas valve. The number on each orifice should be cross referenced with total btu's rating of the furnace. It does seem like there is too much fuel or not enough air intake (combustion air). The inches of W.C. seem fine, but you still may be getting too much volume of fuel with too large of sized orifice's. Hope that helps

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1 Answer

Ruud achiever 90 plus gas furnace flame goes out after few seconds


This could be water in the hoses that connect to the pressure switch , they should just pull off and blow then out also blow out the pressure switch , this sound like a moisture problem with all the bad weather you h, check air filter is not blocked .

Feb 12, 2013 | Heating & Cooling

1 Answer

Luxaire by York Furnace,Model# G8T10012UHB11A,8 Red LED Flashes = Ignition lockout due to recycles,Has flame for a few seconds then goes off; does it around three times,Fan is working; blowing cold air


It sounds like you have a dirty or bad Flame Sensor. They sometimes get a white coating on them. It's not detecting a flame so it shuts off. Sometimes you can clean them and they will work.

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1 Answer

Intertherm mmha070


Hi, did he bypass the high limit to see if it was bad? Sounds like you are getting false codes and you have a problem in your module or main board, which ever you have. The way it is acting, saying the high limit is open but the tech says its not, I would change the board.
Shastalaker7

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1 Answer

Meaning of rudd furnace trouble codes


Error Codes
A green LED indicates system faults
Steady On: System OK
Steady OFF: Board control fault or no power applied
1 Flash: Ignition failure (control in one-hour lockout)
2 Flashes: Pressure switch fault, fails open (switch is
stuck open)
3 Flashes: Limit switch open (main or auxiliary)
4 Flashes: Pressure switch fault, fails closed (switch is
stuck closed)
A yellow LED indicates flame status
Steady on: Normal flame is sensed
Flashes: As flame weakens, frequency of LED flashes
increases

Dec 12, 2009 | Heating & Cooling

1 Answer

Furnace blows cold air, ignitor won't glow.


ok this is going to sound funny but it seems as though the polarity is reversed going into your furnance. to correct this proiblem you first need to unplug the unit and where the cord goes into the furnance at that connection disconnect the two wires. Once theses are disconnected switch the wires .All you are doing is reversing the way the electricity flows into the circut board. I would wager that is the problem

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1 Answer

Weak flame in intertherm furnace


Ok, so we can rule out the ignitor. (standing pilot systems can develop problems that will cause such symptoms.)

Check the gas pressure, make sure you are getting 11 to 14 PSI.

You need that after the regulator all the way to the manifold.

Also check for cracks in the heat exchanger, causing the wind from the blower to distort the flame pattern enough to cause improper contact with the flame sensor.

Make sure the burners and flame channels are clean of rust, and dibri build up, allowing the flame to properly contact the sensors.

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1 Answer

(HVAC) Furnace Not Igniting Quickly


Make sure a back draft in the flue is not happening. Wind can blow it out until the flue heats up. The flame sensor may not be close enough to the burner flame. It may be weak and need to be replaced or if its an optical one it may be dirty and not see the flame very well. Its not wasting much gas but it puts extra wear and tear on the gas controls, is noisy, and, as you said, blows cold drafty air. A gas control system that has issues of any kind is not real safe. It needs to get fixed.

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