Fix Your Carrier Furnace Yellow Light Blinking 3 Times
If you're staring at your carrier furnace yellow light blinking 3 times, you're probably already bundled up in a blanket wondering what went wrong. It always seems to happen on the coldest night of the year, doesn't it? That little blinking amber light is your furnace's way of talking to you, and right now, it's telling you that the pressure switch is stuck open. Basically, the brains of your furnace (the control board) is trying to start the heating cycle, but it isn't getting the "all clear" signal from the safety sensors. ...