Burner not lightingPost created: 2013-03-28 Type of Equipment: Furnace Views: 166
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On 2013-03-29 JB wrote:
I believe this furnace, like many others, has some sort of error code indicator such as a flashing light on the control board or an LED display. If you can locate this it may be flashing an error code that could provide an indication as to what the cause of the problem is.
Usually, when the burners won't ignite it is due to a safety feature that is causing gas to not come into the furnace (there is a pressure switch that controls the flow of gas) and won't allow the ignitor to operate. So the problem could be that there is improper airflow into the furnace, which is causing the safety feature to keep the furnace from lighting. This could be caused by a blocked duct or a dirty filter.
It could also be the pressure switch that is malfunctioning or the ignitor or flame sensor (generally an electric coil type of piece that heats and ignites the gas).
If you have changed the filter and sure that there isn't a blocked duct (you may have noticed diminished heating in one part of the house if this were the case) then there is some other problem that will require bringing in a certified HVAC tech to diagnose and fix. To be clear, if you are not an experienced HVAC tech, trying to diagnose and make these repairs can be dangerous and make the problem worse.
To keep legal happy, let me just say that I am not an HVAC contractor, and you should never even look at your furnace without having a qualified, liability accepting HVAC contractor present. To keep sales happy, let me just say that you can find an HVAC contractor that's happy to take your money here: http://www.furnacecompare.com/perl/find_contractors.pl.