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Igniter glows, gas comes on and burns for 30 seconds and then shuts off. After a few minutes, it does it again.

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This appears to be a sensor problem. Lightly sand the sensor for a good contact with the flame.

Posted on Dec 19, 2008

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The fan blows but the igniter does not light.


When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. On a call for heat
2.The draft inducer motor starts.

3.The pressure switch which has a small plastic or rubber tube attached yo it senses the negative pressure produced by the draft inducer and closes.

4.The draft inducer runs for 30 seconds to a minute before you hear the gas making a hissing sound. The ignitor did not glow,therefore the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the gas hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution:You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Please Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could possibly have a furnace control board problem or a bad limit switch or rollout switch problem.

Mar 10, 2011 | Air Conditioners

1 Answer

I have a Johnson air ease 90 plus.I turn the thermostat up and exhaust blower comes on igniter comes on and i can hear the natural gas release for a second or two then igniter shuts off along with gas. Fan...


If the burners come on for a few seconds and shut off check the flame sensor near the burners and clean it with steel wool, usually this will fix the problem. The flame sensor is a metal rod that is immersed in the burner flame on the opposite side of the igniter. robhvac47_7.jpg

Jan 17, 2011 | Air Conditioners

1 Answer

Carrier 48sx gas pack. Won't turn on. No smell. No igniting sound. Blower fan works. How do I troubleshoot this?


Remove the panel from the heater section, you will need to watch what happends as there is a call for heat. There may be a light on the control board that lights up or blinks to indicate a call for heat. The inducer blower (exhaust blower) will start. INn a few seconds after the blower starts, the igniter will glow orange. After a few more seconds the gas valve should open and the burner will ignite. If the inducer does not run, you may have a bad motor or control board. If the igniter does not glow, you could have a bad pressure switch, bad pressure switch hose or a broken igniter. If the gas valve does not open, you may have a bad control board or bad gas valve. If you get no light on control board, bad fuse, bad thermostat or bad control board.

Jan 03, 2011 | Air Conditioners

1 Answer

My goodman furnace keeps lighting for about 10 seconds than goes out lots of clicking sounds


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad igniter what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat.
2. Draft inducer motor starts.
3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes.
4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas.
Solution: You probably need to purchase and install a new igniter. I would suggest that you inspect your igniter closely for cracks. Make sure you do not touch the igniter with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, roll-out switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

NATE, NCCER, PHCC,HVAC Certified Instructor

Oct 25, 2010 | Air Conditioners

1 Answer

Burners ignite but turn off after a few seconds


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).

Jan 08, 2010 | Ruud Air Conditioners

2 Answers

The exhaust blower starts for about 15 seconds then shuts off. several minutes later, the same thing happens - over and over


goodman furnance the exhaust fan starts, igniter glows hot, all burners lite up & will burn for about a minute and shuts down . I think it senses the room blower does not start so it shuts down.

Oct 20, 2009 | Ruud UBHC Air Conditioner

1 Answer

Weather King 8PJ10NDR01 When I turn the heater switch to ON position the furnace runs what sounds like an internal fan. Second, the igniter glows and when it reaches it's hottest stage the fan thrusts air...


The gas valve is not sensing flame, and the unit shuts down on safety.

Chances are the flame sensor is bad, its a common problem.

If its a thermocouple you can buy one for 10 bucks, If its a newer style they can usually be had for less than 30.

They are easy to replace ad they are usually installed with two screws and one to two wires.

They sit directly in the flame pattern in front of the burners.

A service call should only cost you 250 or less for the repair, but you can do it yourself for less than 50 (including gas to drive to the HVAC supply house that sells your brand unit.)

You will need the model and serial #s when locating the parts.

Dec 27, 2008 | Weather King 12AJA4801AH Air Conditioner

1 Answer

RUUD heater


Sounds like a dirty flame sense rod. Be sure to shut off power before removing the rod and cleaning it with sandpaper or steel wool. Do not touch or disturb the hot surface ignitor or you may cause it to fail.

Dec 27, 2008 | Air Conditioners

8 Answers

Carrier furnace weathermaker 8000


. Several times of recyling power normally brings the furnance up. Though the failure code has always been 31, there are several different behaviour when the blower starts after reset :
a. blower simply creases.
b. there is an attempt to start the heating unit (I hear the high pitch noises), then everything stops.
c. there is an attempt to start the heating unit (I hear the high pitch noises), once I see the orange glow from the coil, normally the gas is lit up and the unit starts working.

Nov 23, 2007 | Carrier XHB123D X/Y Series Heat/Cool Air...

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