Why does my furnace blower continues to run?
If your fan limit switch is set to AUTO but the fan continues to run without ever stopping, you’ll need to call a professional. Two problems that could cause your fan to run without stopping include: A bad fan limit switch that needs to be replaced. Bad thermostat wiring.
Why will my AC not stop running?
Another common issue that can cause your AC to run constantly is a broken thermostat. When your thermostat isn’t working properly, the HVAC system doesn’t know when to turn off even if your home is already the right temperature. If you find that it does not, then you may need to replace your thermostat.
Why does my furnace blower run 24 / 7?
Two settings that you’ll want to check are: Your thermostat fan setting should be set to AUTO, not ON. You see, ON forces the blower to run 24/7 whereas the AUTO setting only runs the blower when your furnace is on a heating cycle. Keeping your thermostat fan setting to ON will also cause cold air to blow out of your air vents.
How can I Stop my furnace blower from running?
Remove the panel from your furnace and locate your fan limit switch. Check the small white button on the switch. If the white button is pressed in, your fan limit switch is set to manual and is forcing your blower to run constantly.
Why is my fan limit switch not pressed in?
If your fan limit switch was already set to AUTO (not pressed in), then you most likely either have a problem with your thermostat wiring or the fan limit switch is bad.
Two settings that you’ll want to check are: Your thermostat fan setting should be set to AUTO, not ON. You see, ON forces the blower to run 24/7 whereas the AUTO setting only runs the blower when your furnace is on a heating cycle. Keeping your thermostat fan setting to ON will also cause cold air to blow out of your air vents.
Remove the panel from your furnace and locate your fan limit switch. Check the small white button on the switch. If the white button is pressed in, your fan limit switch is set to manual and is forcing your blower to run constantly.
How does the fan limit switch work on a furnace?
Fan limit switch moves past ” Fan Off”, then past “Fan On”, Blower doesn’t start until about 10 – 20 degrees above “Fan On” Then blower runs on for 30 seconds and shuts off for a few minutes, turns back on for 30 seconds, and shuts off for a few minutes.
If your fan limit switch was already set to AUTO (not pressed in), then you most likely either have a problem with your thermostat wiring or the fan limit switch is bad.
