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Why does the ignitor not always start the heat

The ignitor starts and the gas goes on but the blower does not always come on with heat, and it is not because the house is warm enough that the thermostat is higher than the tempature set.

Sometimes the ignitor starts and then goes off and the blower starts with cold air.

What could cause this if the ignitor was replace and the filter was just replaced?

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Id say it could be either a control board or blower motor problem.

Posted on Nov 30, 2008

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My Ruud achhiever 90 starts to fire but as soon as the blower fires the burner goew out. I also noticed that the "igniter" on the end isnt firing. Could that cause the burner to not stay lit when the


There is an ignitor and a flame sensor. If the ignitor does not ignite the gas after a time, it goes out. If the flame sensor does not detect ignition the gas valve closes. When you start it you should see the ignitor come on like a light bulb and glow, then the gas valve opens and you get ignition. Then the flame detector turns on when the ignitor goes out. Flame detectors are like a chrome wire that has one connection to it and it sits part of the way in a burner. They get dirty and corroded. When that happens it shuts down. You can clean the flame detector with steel wool of scotch brite pads. Dont get too carried away doing that though.

Dec 25, 2012 | Air Conditioners

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Furance blower works, ignitor come on for a short time we hear a click ignitor goes out blower runs for a short time ignitor come again but gas not coming on. What is wrong.


The ignitor needs to get up to a predetermined temperature prior to opening up the gas valve, you could have a weak ignitor. You need to see if the PC board is sending 24 volts to gas valve. If it is but no gas, bad gas valve. If not, bad ignitor or bad PC board. I would change out the ignitor first since it is a wear item as well as the cheapest component.

Mar 14, 2011 | Air Conditioners

1 Answer

I have a newer tappan heater and get 4 blinks on led for error code the unit starts up fine and has flame but flame goes off when blower kicks on


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor 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 ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout 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.

Nov 26, 2010 | Air Conditioners

1 Answer

Have a ruud achiever 90 plus furnace. the flame goes out after the igniter quits. any ideas


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor 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 ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout 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.

Nov 26, 2010 | Ruud UBHC Air Conditioner

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CARRIER WEATHERMAKER 8000.NOT SURE HOW OLD. HAVE POWER,FAN COMES ON,IGNITOR GLOWS,GAS VALVE OPENS,BLOWER RUNS,IGNITOR GOES OUT. CYCLES THREE TIMES LOCKS OUT. ANY IDEAS?


sounds like the roll out switch may be sensing a clog. here is a website that can explain things better, hope it helps Tim:

http://arnoldservice.com/Troubleshooting_Heating_Problems.htm

Oct 30, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

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I found the Bryant furnace 395cav048090 calling for heat but not operational. I shut off power to the unit and switched power back on and the unit started its ignition sequence. With power on the blower...


If you do not see a bright light before the gas releases, your ignitor is probably out. If you disconnect, you should measure ohms from the two ignitor leads. If you do not measure any, it is open and will not work. You will usually see a mark of white on the ignitor. Another possibility is the circuit board may not be sending the required voltage to ignite the ignitor so you'll want to check that too.

Jan 11, 2010 | Bryant Air Conditioners

1 Answer

The gas sometimes ignites and the goes out and


Check out my tip. I think it will fix your problem.

Jan 04, 2010 | Air Conditioners

1 Answer

No heat from unit. Hear ignitors start but no airflow in house


well i need to know if the fan comes on at all if not then it could be a bad motor or board which is not uncommon but if the fan does come on and then flames go out and fan stays running could be high limit check to make sure in the bower compartment there are no wires disconnected from the blower sometimes when changing the filter it is possible to knock the wire off the board

May 19, 2009 | Air Conditioners

1 Answer

I have a problem with my heating system. It is about 10 years old and has had the ignitor, combustion blower motor, and programable thermostat replace in it's lifetime. The system worked great last year....


sounds like its not proofing flame. it has a sensor usually like a needle sticks out into the flame that tells the gas valve the flame lit and is burning so its ok to keep sending gas, if its fails to proof flame then burner shuts down, then it tries to relight 3 times then locks out on fail safe. the blower will sometimes run continually once that occurs to highlight a failed condition. every time you reset it will try again 3 times then shut down. lp gas is very dangerous, even i do not work on it as the gas acts like gasoline and lays around. not like natural gas that disperses well. if you see the flame sensor try gently cleaning it with a little emory cloth. also a loose ground can cause this. check tio be sure any green wires are snug , they actually flow volts to ground through the flame on some to proof, thats why no ground no flame. if that fails then the board is most likely problem. change wire for wire , or get generic replacemant and follow directions exactly. good luck.some ignitors act as a flamre proofer as soon as they are done igniting! rarely do they fail to perform both funtions.

Nov 20, 2008 | Air Conditioners

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