Runs for about 5 mins and shuts downPost created: 2013-04-04 Type of Equipment: Furnace Views: 175
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On 2013-04-12 JB wrote:
When you say runs for five minutes do you mean the blower turns on and then shuts down? Or does it fire for five minutes and then shut down?
If it's the former, most furnaces have a phase prior to ignition where air is blown through the heat exchanger to kind of clear it out before the burners ignite. If there is a problem with the furnace it has a number of safety features that will prevent ignition and then the blower will shut down. The list of issues includes everything from a dirty filter to a malfunctioning gas switch. In either case the furnace is noticing there is improper air flow or gas flow and preventing ignition.
Is the furnace giving an error code? This would be either a couple of flashing lights on the control board or an LED display. Once you read the code you can have a better sense of what is wrong.
If the burners fire and then quickly shut down it could be a flame sensor, faulty control board and so on.
It is more than likely that you will need to call in a certified HVAC tech to properly diagnose and fix the problem.
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.