Always onPost created: 2013-03-27 Type of Equipment: Furnace Views: 124
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My furnace is always on. Although there are parts of the house that remain cold. I have checked the vents, changed out the filter, etc.
On 2013-03-27 JB wrote:
Is it the fan that is always running or is the furnace burner always on? Also does it stay on if you turn the thermostat down? And are you getting any kind of error code on the furnace? To find this there should be a set of blinking lights or an LED display indicating a code that will give a sense of the problem. You should find information on this in your owner manual or perhaps on the inside of the main cabinet.
Also, is there a single thermostat or are their different zones? In either case, is the thermostat or one of the stats in a room that isn't receiving heat? If this is the case it may be that it simply isn't registering that the house is heated and signalling the furnace to shut down. I'm not sure why a single room wouldn't be getting heat, but it could be a blocked duct (unlikely I think). If the furnace was feeding baseboards with hot water there would be a switch for each zone in the house that opens or closes depending on if that zone needs heat. These can malfunction over time and need to be replaced. However, since this is heated air traveling up through duct work I doubt there is a similar switch that could be malfunctioning.
One thought is that perhaps the main control board is malfunctioning and causing the furnace not to shut down.
If it is the fan and not the burners then there could be a malfunctioning relay or limit switch causing the problem, though not sure why that would affect the heat in some rooms and not all. There could also be a short causing the problem.
So there could be a range of issues at play here. The best thing to do is look for an error code. Either way, given the situation you should probably call in a certified HVAC tech to come diagnose and fix the problem. More often than not it is a relatively simple fix, but hard to say for sure right now.
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.