Why is fan running when heat is off?
The fan limit switch is responsible for turning the blower on and off at the appropriate times. So, when the switch is working correctly, your furnace fan should turn on several minutes after thermostat calls for heat and turn off several minutes after the heat cycle ends.
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 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 long does it take for Furnace Fan to stop blowing?
This shuts the furnace down and prevents your thermostat from calling for more heat. If the furnace was in the middle of a heating cycle, wait 3 to 4 minutes for the blower fan to stop running. Did your furnace fan stop blowing?
Why does my Furnace Fan not stop running?
Well, if your furnace blower fan won’t stop running, you could have any of the following problems: 1 You’re using the wrong thermostat fan setting 2 Your fan limit switch is on “manual override” 3 There’s a shorted thermostat wire 4 There’s a shorted wire at the fan limit switch More …
Why does my furnace blower fan not stop running?
Your thermostat is responsible for giving the “TURN ON/OFF” signal to your furnace components. So if your blower fan just won’t stop running, the first place to check is at the thermostat. Two settings that you’ll want to check are:
Is it better to leave the blower fan on or off?
Constantly turning the fan on and off can cause wear and tear to your system, which can reduce its lifespan. Over time, this may cause more frequent breakdowns. To avoid this, it may be best to leave the fan on.
What to do if your furnace is blowing non stop?
To make sure you haven’t asked too much of your furnace, try lowering your thermostat 5 degrees lower than the current room temperature. If you’ve tried both of the above and your furnace blower is still blowing non-stop, then move on to checking your fan limit switch.
Why does the Furnace Fan keep running during the heat cycle?
Details about these three settings are at FAN LIMIT CONTROL SETTINGS. In this common situation the furnace heat source or BURNER goes OFF then back ON DURING the HEAT CYCLE while the blower FAN KEEPS RUNNING – that is while the thermostat is continuing to call for heat.
