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Posted on Jan 03, 2010
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Carrier super saver furnace keeps going on and off

Carrier super saver furnace keeps going on and of.

intermittent furnace pilot.

burners light but run for a short time only before furnace recycles.

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Anonymous

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  • Posted on Jan 03, 2010
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Sounds like the flame sensor is dirty or bad. This sits in the burner flame when the burners are running. This usually has a single white wire connected to the back of it.

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0helpful
1answer

My CUHN 75A-1 gas heater will not light. 4 flash code = high limit or rollout switch open. when I cycle start, the large fan runs, where normally it only starts after the heater lights.

  • What Is Electronic Ignition?

    Jupiterimages/Getty images The electronic ignition system in a gas furnace is a modern development that provides more reliable performance than a standing pilot and offers energy savings through better furnace efficiency. There are two basic types of electronic ignition systems:
    • An intermittent pilot system uses an electronically controlled high-voltage electric spark to ignite a pilot light and subsequently the main burners when the thermostat calls for heat.
    • A hot surface ignition system uses an electronically controlled resistance heating element, not unlike a light bulb filament, to ignite the gas burner.
    Understanding some of the basic components of a modern furnace will help you identify the type of furnace you have and narrow down the list of potential problems.
  • 02of 05

    Types of Electronic Ignition Furnaces


    Design Pics/Getty images Most furnaces with electronic ignition are either conventional induced draft furnaces or high-efficiency condensing furnaces.
    Induced draft furnaces use a small fan to draw the combustion gasses from the combustion chamber and out of the house through the flue (chimney). This system is more reliable and safer than old conventional furnaces, which relied on a natural draft coming in from an opening at the front of the furnace. Induced draft furnaces use either an intermittent pilot (IP) or hot surface ignition (HSI) instead of a standing pilot light. The combination of electronic ignition, electronic controls, and artificially created draft improves the efficiency of induced draft furnaces over older conventional models.
    Condensing furnaces use two heat exchangers, where conventional furnaces use only one. After the gas is burned to heat the primary heat exchanger, the secondary heat exchanger draws heat out of the hot exhaust gasses, cooling them to the point that the water vapor in the exhaust condenses into water. The resulting flue gases are so cool they can be vented outside via a plastic (PVC) pipe, while the condensed water is run to a floor drain. Condensing furnaces use hot surface ignition (HSI).
  • 03of 05

    Troubleshooting an Intermittent Pilot (IP)


    Michael Interisano / Design Pics / Getty images Typically found in induced draft furnaces, an intermittent pilot ignites the burner gas with a high-voltage spark only when the thermostat calls for heat. Once the pilot is lit, and the main burner senses the pilot flame (using a flame sensing rod), the main burner ignites. The intermittent pilot flame goes out after the heating cycle and remains off until the next time the thermostat calls for heat.
    The furnace gas valve for this type of furnace is identifiable with its solenoid designations: MV, PV, and PV/MV - where MV = main valve, PV = pilot valve, and PV/MV = common.
    Common problems with IP ignition include:
    • Ignition doesn't occur, and the furnace won't go on
    • A spark is present, but the pilot won't light
    • Pilot lights, but the main burner doesn't come on
    • Burners ignite but turn off after a few seconds
  • 04of 05

    Troubleshooting a Hot Surface Igniter (HSI)

    The hot surface igniter (HSI) is the most commonly used electronic ignition system. It works like a light bulb filament, heating up when electricity is passed through it. Most are made from silicon nitride or silicon carbide. The igniter is located in the flow of gas entering the burners.
    When the thermostat calls for heat, 24 volts are sent to the electronic ignition control module, which energizes the furnace blower and other systems and sends 120 volts to the HSI. The HSI heats up to around 1,800°F to 2,500°F and glows red-hot. Then the gas valve opens, and the burner gas is ignited by the HSI. Once a proper flame is sensed by the flame sensor, the HSI turns off and stays off until the next heating cycle. In some furnaces, the HSI also serves as a flame sensor (called local sensing) instead of having a separate sensing rod in the burner flame (remote sensing).
    Under normal conditions, an HSI should last for three to five years, and they eventually crack and need to be replaced. This can happen sooner if the oils from your skin get on the element through improper handling. That means: Don't touch the element with your bare hands!
    HSIs usually cost between $25 and $50, and it's a good idea to keep a spare on hand, in case one goes out at night or on the weekend, when you can't easily get a new part.
    Here are some of the common causes of HSI failure:
    • Premature failure due to improper handling (oil from skin got onto element)
    • Improper igniter
    • End of normal usage life cycle (keep a replacement on hand)
    • Voltage in the furnace electrical circuit is too high (over 125 VAC)
    • Severely dirty air filter, causing the high-temperature limit switch to cycle the furnace ignition on and off frequently
  • 05of 05

    Reading Control Board Codes


    Mohd Firdaus Mohd Damanhuri/EyeEm/Getty images Most modern furnaces with electronic ignition systems have an integrated circuit board that controls many sophisticated processes. The boards can perform self-diagnostics and provide failure codes, similar to the diagnostic computer in your car.
    If a failure occurs, LED lights on the control board light up in a blinking pattern to indicate a specific failure code. The codes are listed in a chart in the owner's manual and usually on a door or access panel on the furnace. Control boards are usually located inside the blower compartment of the furnace. If the board has blinking lights, refer to the chart to decipher the code and help identify the problem area with the furnace.
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Nov 20, 2018 • Heating & Cooling
0answers

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
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Be the first to answer Feb 28, 2016 • Carrier Weathermaker 8000 Gas Furnace 125k...
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1answer

How do I troubleshoot a Carrier Gas Furnace 58GS125-JA that Pillot stayed On but Burner will not fire
Good afternoon Victor. It is a good sign that your pilot light is staying on. That means that the gas valve is recognizing the open flam and is keeping the pilot valve open. Now onto your issue. Can you tell me if the unit is a standing pilot or intermittent pilot(doe the pilot stay on all the time or is it lit with a spark upon a call for heat)?
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Dec 04, 2013 • Office Equipment & Supplies
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1answer

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).
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Mar 13, 2010 • Carrier Heating & Cooling
1helpful
1answer

Carrier Furnace Operations
Hi,
Yes, That is normal for many furnaces, not just the Carrier...
Seems to be a bit dumb but then the ones who desogn these things are sitting behind desks and not out in the field working on them. I'm sure they have a perfectly good reason to have the furnace do that but I have never figure it out....
It does get your attention when the furnace is there running for ever, blowing cold air and burning up your electric....
You just hope that it does not happen when you are away for an extentend period of time...as you said.
Always make sure that if you have someone checking in on your place that they verify the temperature and not just peek in and say yup the furance is running...

I hope that this will help you to solve your problem!

Thanks for using Fixya!!

Heatman101
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Jan 01, 2010 • Heating & Cooling
0helpful
1answer

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.


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Jan 01, 2010 • Carrier XHB123D X/Y Series Heat/Cool Air...
1helpful
2answers

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).
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Dec 24, 2009 • Carrier Heating & Cooling
3helpful
2answers

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
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Nov 16, 2009 • Carrier XHB123D X/Y Series Heat/Cool Air...
2helpful
1answer

Carrier Weather Maker 8000 with 88,000 btu natural gas furnace lights and runs sometimes and other times it will light and then shut-off when the electric pilot turns off? Does this sound like a bad...
Hi, You say that it will light and then shut-off when the ELECTRIC pilot shuts off? If it has an automatic pilot ignition, it wouldn't have a thermocouple? It would have an ignition module with a flame sensor. Could you check this for me and let me know which one you have for sure? I can help you out better if I knew. Thank you and please get back to me.
Sincerely, Shastalaker7
Ps If it is electronic, there will be a flame sensor mounted next to the pilot. It has a ceramic body with a metal rod coming from the end.You can take a piece of steel wool not sand paper and clean the metal rod (sensor). The pilot flame will surround this keeping the burners on.After cleaning it, and if the pilot continues to go out, I would say that you're ignition module has an intermittent internal problem, and needs to be changed.
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Oct 30, 2009 • Carrier XHB123D X/Y Series Heat/Cool Air...
1helpful
5answers

Carrier weathermaker sx 58 furnace
I have serviced these furnaces for 20 years and I can tell you most of these models did not have diagnostic lite on them. (although some did, especially if the control board has been replaced) The problem is most likely a bad 3 wire pilot. This will cause exactly what you describe. 2 things to consider though. 1, If you were to replace the pilot don't get a cheaper knockoff. In my experience these do not last long at all. Get the right one from a carrier dealer. It will cost more but be much more reliable. 2 What is the condition of the secondary heat exchanger? Most if not all of the sx series had issues with the secondary heat exchangers rotting out and leaking. If the furnace is out of warranty you would be much better replacing the furnace as the cost of replacing the secondary heat exchanger will probably be almost the same as a new furnace. ( those babies are EXPENSIVE!)
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Dec 17, 2007 • Heating & Cooling
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My CUHN 75A-1 gas heater will not light. 4 flash code = high limit or rollout switch open. when I cycle start, the large fan runs, where normally it only starts after the heater lights.

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