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The ignitor come on the fan blows but no heat

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  • Heath Moyer May 11, 2010

    What type of furnace or equipment do you have?



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Posted on Feb 01, 2010


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My heating unit is coming on and just running not blowing heat at all. what could be wrong?

my first impression is that the filters are too dirty and they caused the high limit to trip. needs serviced.

Jan 31, 2015 | Carrier WEATHERMAKER 48TCEA 4.0 ton Gas...

1 Answer

Why does the relay and control board keeps clicking the igniter doesn't come on, and furnance doesn't work?

It should only do that a few times then lock out necessitating reset by cycling the power at the furnace switch or at the t-stat. More than likely your hot surface ignitor is defective. Sequence should be something like this: Call for heat, combustion air fan initiates and blows for 30 seconds during a 'pre-purge' condition, then a relay clicks to energize the hot surface ignitor. If it does not ignite the flame within a few seconds, usually around 5 or 6 seconds, the ignitor relay clicks again and drops it out.

The flame sensing rod has to see flame to rectify the ground signal to the circuit board very quickly or else raw gas would continue to dump into the heat chamber. After the HSI relay drops out on flame failure the combustion air fan continues to run for a post purge cycle to purge the heat exchanger of any unburnt fuel before the sequence is initiated again.

Unplug the ignitor molex plug. It'll be within a few inches of the HSI itself. Insert a voltage test meter set to read 120 volts into the molex plug going TO the ignitor. Re-establish the call for heat, wait for a cycle of the relay clicks and steadily watch the meter. If the ignitor is bad, you should see 120 volts at the connection you are plugged in to AFTER the 30 second pre-purge. Watch closely, you may only have a 6 second window to see it because it will drop it out on flame failure.

Of course there are other issues that could be possible, but this is the most likely. If you do determine the ignitor is bad and you obtain a replacement DO NOT TOUCH the portion of the ignitor that glows (to ignite the gas) during assembly !!!! The oil from your skin will shorten the life expectancy TREMENDOUSLY.

Oct 29, 2014 | Dayton Gas Furnace Heater

1 Answer

Hello Dryer turns on, fan blows, and no heat (flame). verified no voltage at the ignitor. What next?


If you are having problems with your gas dryer not heating the most common problem is that the ignitor goes bad. Even though it glows sometimes it is still not working properly.

if you dryer is gas check out this gas no heat tip....

If you have an electric dryer, you can have many different things that can go wrong causing the dryer not to heat.

check out this electric no heat tip...


Dec 17, 2010 | Kenmore Dryers

1 Answer

I have air coming from the vents but no heat. The furnace is 23 years old and I've never replaced anything in the unit. Best guess? GE Intertherm. thanks

If the thermostat is set on Fan and not Auto the fan will continue to run. If the fan control is bad or is set at too low of a setting, it will blow cold air after the furnace has shut off. From what I guess of your explanation, your furnace is not producing any heat and the room air blower runs blowing cold air. You may have two issues happening. Make sure your thermostat is calling for heat by setting it to a high setting. Inspect the thermostat to see if it is set at Auto. Go to the heating system and inspect it to see if it is heating. If you can't view any flames carefully touch the exhaust pipe and see if it is hot. If not, you have a no-heat condition. A 23 year old furnace may need some TLC so call a technician you trust. He/she may need to replace the ignitor or thermocouple to get it going. They will also check out why your fan is running when it should not.

Nov 02, 2009 | Heating & Cooling

1 Answer

Dryer doesnt blow hot air.

I find that quite often the ignitor is out of alignment or the glass window is covered with lint.
a gas dryer blows air through a burner assembly to heat the air. The burner assembly consists essentially of a gas valve, ignitor and a flame sensor. If any part of the burner assembly malfunctions, the result will be low or no heat and slow drying of the clothes.
There are two common styles of ignitors, glow ignitors and spark ignitors. The ignitor ignites the gas either by heating up and glowing, or by sparking. If the ignitor fails, the dryer will not heat.

The easiest way to check the ignitor is to observe it. Remove the small access panel in front, select a high temperature setting and start the dryer. Watch the burner assembly, shortly after starting the dryer the ignitor should begin to glow or spark. If you see it glow or spark, then the ignitor is working.

Aug 19, 2009 | Kenmore Dryers

1 Answer

Gas dryer wont heat up, blows only cold air.what would cause this

Could be a bad hi limit thermostat. Could be a bad glowbar ignitor. Check the glowbar ignitor at the gas valve, is it glowing bright orange/red? If not. Replace the ignitor.

Jul 22, 2009 | Whirlpool Dryers

1 Answer

Gas Furnace is not heating anymore.

the fan you hear come on at a call for heat is most likely just the inducer motor. the click you hear is probably the relay for the hot surface ignitor which should glow red, then in turn ignite the main burners. your going to have to determine if the ignitor is coming on. if it isnt the ignitor is bad and will need to be replaced. if it comes on and than shuts off after a few seconds the ifc board is probably at fault

Apr 09, 2009 | Heating & Cooling

1 Answer

No gas to light the pilot

ignitor coil could be bad again

Sep 11, 2008 | Heating & Cooling

1 Answer

Rheem heating unit

pls check your settings. if not you have a defective heater.

Jan 20, 2008 | Mitsubishi MS12TN Air Conditioner

1 Answer

A carrier furnace

If your are talking about a combustion motor, not the actual blower that blows into the home, it is not satisfying your controls going back to the board. There is a vacuum module that has to satisfy first. If all that is satisfied, you may have a bad ignitor. Do not touch the ignitor part of a new one with your fingers.

Dec 01, 2007 | LG Heat cool Window Air Conditioner

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