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Heating Fan works but no hot air, I have gas heat, I was able to see a intermitten sparks coming from the ignitor

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Check you gas supply and make sure it is on
turn off the furnace and back on and watch what happens
how old is it
what brand is it

Posted on Jan 11, 2008


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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.

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MY carrier model #58DHC with hot surface ignitor has quit working. Blower works, but no heat. If you turn the thermostat to on fan will run but no heat. Did preliminary testings with self test on printed...

If you suspect its the ignitor? The hot surface ignitor is powered by 120v. Inspect ignitors' hot surface for cracks or burnt spots. Uplug ignitor from board. Cycle heat on and verify 120v to the ignitor at the cannon plug on the board where the ignitor plugs in. If you have the voltage then replace the ignitor. If not, you'll need to verify all other circuits are working before condemning the board. Work safe and at your own risk! Hope this helps!

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What does the spark ignitor look like and how hard is it to replace my dryer runs great just no heat i have the front off and can run the dryer but i dont see any flame or spark underneath of it


Most modern dryers use a hot surface ignitor...

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...


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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.
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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.

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If you need further help, reach me via phone at

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