Question about Carrier 38CKC042 Air Conditioner

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Furnace burner turns off and on

I have automatic igniter it will ignite and have the burner running for a good maybe 10 to 20 min then it will shuts down regardless that the temperature setting is high. i set mt room temprature to about 80 and the temp in the room is 65 so it shouldt shuts down unless it meets the 80 temperature but still it will shut down then turn on again

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  • Nilo Soriano Jan 17, 2009

    thank you for your input

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The furnace is likely over heating and the high temp. safety is shutting it down. It then cools and starts again. Things to check: Filter, Blower wheel and indoor A/C coil. If any or all are dirty you are limiting air flow and need to clean them.

Posted on Jan 17, 2009

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Posted on Jan 02, 2017

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Home Heating Repair - How to Change Your Gas Furnace Igniter


You have run all the tests and they all point to your igniter being bad in your gas furnace.
Your purge blower runs, the power comes on to the igniter, but you get no glow from that little wonder. How can it be changed?

Changing the igniter on your gas furnace really is not all that hard. But it may require a bit of patience and some tools that can get into some very tight quarters. Some furnace manufacturers have design their units to make this job very easy. Some other engineers obviously have never got away from their desk and picked up a screw driver. Hopefully you are lucky enough to have one of the easy ones.

The higher the efficiency of your furnace the harder this job will be. Usually the 90+ furnaces will have the burner compartment sealed. You will have to get the covers off of the burner compartment to get to the igniter. On the 80%er’s the igniter will usually be somewhere on the burner nearest the center of all the burners. Make sure that you remove all power to your furnace before you attempt to remove the igniter. It runs on 110V power and will give you a good jolt if you touch it with power going to it.

Once you have located the igniter, you will need to find the screw or screws that hold the igniter in place. Remove or in some cases just loosen the screw and remove the igniter. Take careful note of the location and position of the old igniter so that you can reinstall the new one in the exact position as the old one. In most cases the wiring will just be a Molex plug that you can just unplug the old igniter and then plug your new igniter back into it.

Carefully position the new igniter into the same location and tighten the screw(s) that hold it in place. Plug the new igniter into the plug and replace the covers on the burner compartment if there is one.

Now you can turn the power back on to your furnace and try for ignition. Hopefully you get the glow and ultimately fire in from the burners. This will give you heat and make everyone happy!

http://www.fixya.com/support/r4015846-furnace_ignitor_care_home_furnace

on Dec 06, 2009 | Heating & Cooling

1 Answer

Where is my flame sensor on a single burner coleman evcon high efficiency furnace


If this is a hot surface ignition system, the sensor may also be your igniter.

Dec 11, 2013 | Heating & Cooling

1 Answer

Our Gibson KG7TC060D24B "tries" to start, but the shuts off before ignition. Technicians have replaced the control panel and other components but the problem persists, with the furnace working for a few...


This is possible, however it is possible they are missing something simple. I hope you can follow along.
1) Is this a Sealed Combustion Furnace, meaning you cannot get to the burners even after you remove the Door Panels?

2) If yes, is this furnace vented with pvc/plastic piping?
3) If yes, do both pipes go outside?
4) If yes then try this.

1) Turn the main power off to the furnace
2) Remove the Door Panel to the burner section.
3) Turn Furnace back and turn the thermostat all the way up.
4)Look into the burner compartment and tell me if the igniter glows red. If it does and the goes out with the burners not coming on.

5) If you feel comfortable or know of someone that is.
6) Turn the furnace off, remove the panel that conceals the burner compartment.

7) Turn the furnace on, if the igniter glows red and the burners ignite. Your problem is in the venting system. Most likely the intake pipe if it goes outside. It could be plugged or something is blocking it. If the burners do not ignite the next thing to make sure that is happening is that the Exhaust blower is operating and you can feel air outside where the pipe terminates. If you it is but no very strong, then your problem could be the inducer motor or to small of vent pipe.

If you could, send me some information about how it starts up
1) Main blower may come on and shut off, make sure the blower runs in on position 1st then back to Auto position. If it does not, you have another problem.

2) The Exhaust blower should come on next
3) About 17secs. later the igniter should glow red.
4) You will here the gas valve make a click
5) The Burners will ignite
6) The flame sensor rod on the far left hand side of the burner will keep the burner lit. If it is dirty the burners will shutdown.
7)About 90secs. later the main blower will come on.

Oct 26, 2013 | Gibson KG7TC060D24B 60,000 BTU 95.1% Gas...

1 Answer

Weatherking furnace will not ignite


Turn off power to furnace and remove upper panel only. Turn the power back on and turn the thermostat all the way up. Go back down to furnace and watch the burner section.

This is what you should look for
1)On the left hand side of the furnace near the burner, the igniter should glow red, if it glows red and shuts off without igniting the burner then you have a problem with the venting or faulty pressure switch.

2) If it does not glow red but you have power to the furnace, the ignitier is most likely cracked.

Oct 23, 2013 | Heating & Cooling

1 Answer

Amana furnace. The furnace goes through the cycle but wont ignite. I have already checked the ignitor.


Try blowing out the jet Burners with compressed air especially the one nearest the Ignitor. Right through where the gas comes in. These can get dusty and cause ignition failures. Also check to see if the Ignitor is in the path of the burner and has not somehow gotten bent. 100 or so ohms on the Ignitor should be good.

Oct 10, 2012 | Amana GMVC80905CX Gas Furnace

2 Answers

Gas furnace, main burner ignites the other 2 don't. then shutdn.


Between the burners is a small rail in the pressed steel where the flame runs across to light the other burners and it sounds like there is dirt or debris in the step over rails causing the problem. You will need to use some compressed air on those rails to clear them out. Once the rails are clear the other two burners should ignite right away.

Dec 21, 2009 | Heating & Cooling

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

Gas furnace wont stay lit


sounds like the thermocouple that senses when the burner ignites is faulty. when the burner is first lit it looks for a signal from the thermocouple telling it that it has ignition. i have had some luck removing the part (furnace off) and sanding it clean. this is located in front of one of the burners..Good luck

Jan 15, 2009 | Central Dual Temperature Heat Gun Kit...

1 Answer

Honeywell Gas Furnace


A Make and Model number of the furnace not the thermostat will help but I can walk you thru the operation of a typical furnace. It sounds to me that the burners are igniting properly but the flame sensor is not sensing the flame and shutting down the system. You will need to find the sensor and clean it and check the wire from it to the control board. Typically, the flame sensor is found at one side or the other of the burner box. It is a small probe that the flame hits. Depending upon your model it may have a small wire attached to it leading back to the control. Or it may be part of your auto-pilot assembly. ? At any rate, you will need to get to it and very delicately brush it off. Then inspect the flame channel. This is a trough area where the flame travels to ignite all burners. Over time, they tend to fill with rust and debris. Take a small screwdriver and run the blade down the trough. Inspect the wire that goes from the flame sensor to the control board. Make sure it is not frayed or broken or shorting out and that the connection at the board is good.

Beyond that, it's time for a technician to come.

Let us know the Make and Model of the furnace (found inside the furnace cabinet) and maybe we can help you further.

Nov 19, 2007 | Heating & Cooling

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