I have a concord 80 plus gas furnace and today its been working fine until I noticed it started blowing cool air and it won't turn off just steady stays on even when I set the thermostat to off, it just blows like its about to do something but nothing. Usually when I turn it on it blows for a few seconds first and then the heat come on but now it constantly runs like it have a mind of its on now me my wife and my 3 kids have to all sleep in one room until I figure this out. IS THERE SOMEONE OUT THERE THAT CAN HELP ME??

With the blower on all the time Its telling you that a limit is open. The control board should tell you what to check. Count the blinking light to figure the fault code.

With the blower on all the time Its telling you that a limit is open. the control board should tell you what to check. count the blinking light to figure the fault code.

Are you talking about the green light if so it does a regular bleep I guess. Well I just checked and it beeps 4 times then stop for about 2 to 3 seconds then repeat 4 beeps.

You should have something there that tells you what the code is. Look on the outside of the bottom door, also inside the bottom door. Also there might have been an instruction manual left there by the furnace somewhere. Read about the flashes if you find them and let us know what it says.

The diagram shows nothing for 4 beeps