Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

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How o light pilot light on a carrier a/c unit for the heat

Gas heaing unit will come on but will not ignite. Can not see a pilot light.

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Can't light the pilot ligh on a Carrier furnace Serial# N550293 and Model# 28ACO24000.

Posted on Nov 13, 2008

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WILL NEED A MODEL# AND APPROXIMATE AGE OF FURNACE.

Posted on Dec 15, 2007

  • crsmdv Oct 26, 2013

    carrier 58ss

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Why wont an older model carrier gas furnace light when standing pilot light is lit at all times? Why would there be no gas at the burners


when it comes to GAS appliances , I do not recommend any self fixes . they can explode and do you serious damage even up to death .call a gas furnace repairman

Feb 28, 2016 | Carrier Weathermaker 8000 Gas Furnace 125k...

1 Answer

Burners not burning, pilot light is off. How do I start the pilot light?


There is no pilot on this unit. It is electronic ignition.

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).

Mar 29, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

I have a carrier 58sx040. Sometimes after the pilot comes on the main flame will start then stop about every 3 seconds. This problem intermittent. There is always a noise coming from the gas inlet when...


Dirty flame rod, polish it with a scrub pad.

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).

Mar 13, 2010 | Carrier Heating & Cooling

1 Answer

I have a technical question regarding implementation of my Carrier furnace within my residence. Specifically, the furnance has been installed for 17 years and I have not had any problems with it. I have...


Thats a safety.

The unit senses a failure to ignite, so it goes into safety mode keeping the blower running to prevent overheating and fires. And keeping the inducer motor running to prevent the same, as well as raw gas build up inside the unit.

The newer systems are "smarter" and can detect more specific problems and failures. The older ones simply know that the thing didn't light, so they bring on the fans for safety.


Jan 01, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

2 Answers

Having problems with Carrier 58RAV furnace. Goes through the motions, but gas never turns on. I think it is a problem with the LPGS. Please advise. Thanks


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 24, 2009 | Carrier Heating & Cooling

1 Answer

Carrier furnace, pilot does not light, fans run for a couple minutes and then flashes code 31


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 28, 2009 | Carrier 38CKC042 Air Conditioner

2 Answers

Gas heater won't ignite


I agree. Either the pilot flame is dirty and is not making good contact to heat up the bi metal strip on the pilot assembly, or the pilot assembly is defective. 90% of the time if you clean the pilot orfice and the pilot burner it will take care of the problem

Nov 16, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

Blower but no heat, no gas or no pilot ignition?


The pilot has to be lit.And to do so turn the knob to pilot.Then press it down and gas will come threw the pilot,then light the pilot,and hold the button down for about 45 seconds,count slow.The pilot has to heat the thermocouple up before the pilot light will stay on.Once it stays lit,turn the knob to on.

Oct 20, 2009 | Heating & Cooling

1 Answer

Home gas heater


Need more info. Does it have a pilot light? Some are spark ignition and some hot surface which both light themselves, except for pilot style.

Nov 07, 2007 | Carrier XHB123D X/Y Series Heat/Cool Air...

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