Fan stops and heater continues to heat.
Hi, If the main fan stops blowing air but the burners continue to stay on and not shut off, this is dangerous. It sounds as though the fan control combination limit switch is faulty or stuck. The burners should shut off before the fan. If this unit only has a high limit for safety, it should shut the burners off when it reaches a predetermined temperature to keep the unit from burning up. That's why these safetys are in place. If your furnace has the combination fan/limit control, and it is stuck or has failed, this will cause the burners to run. I would turn the main gas off until the problem is found, or kill the power. Can you give me the age of the system, and model, serial numbers and the name of the heater? This would be of help. I would be very careful if you use it if its very cold where you are, and turn it on and off as needed. Do not go to sleep with it doing this for your safety,please. Get back to me if you will.
May 19, 2010 |