Why does my AC fan not run in auto mode?
Here are the symtoms. The outside unit keeps running when COOL on. The inside FAN doesn’t run when in AUTO mode. If I leave the FAN ON then the AC works fine Cooling correctly. Is the thermostat not working correctly or something in the AC unit causing it to do this?
What’s the difference between auto and on on AC fan?
You’ll notice two settings: auto or on. Auto means the fan in your central air system will kick on automatically when a cooling cycle begins. Conversely, the “on” mode means that the fan will run continuously, whether or not the system is cooling. Let’s take a closer look at these settings and when you should use them.
When to set your HVAC fan to auto or on?
The fan only runs when the system is on and not continuously. There is better dehumidification in your home during the summer months. When your fan is set to AUTO, moisture from cold cooling coils can drip and be drained outside. If your fan runs continuously, moisture does not have a chance to drip outside.
Why does my HVAC fan run at different speeds?
Usually A/C, heat, and fan run the blower at different speeds. It’s possible that the speed the A/C uses is dead. Any easy test, is to swap the motor speed wires connected to HEAT and COOL on the board. Then see if the blower starts with the A/C. If it does, that means the speed used by A/C is dead.
Here are the symtoms. The outside unit keeps running when COOL on. The inside FAN doesn’t run when in AUTO mode. If I leave the FAN ON then the AC works fine Cooling correctly. Is the thermostat not working correctly or something in the AC unit causing it to do this?
You’ll notice two settings: auto or on. Auto means the fan in your central air system will kick on automatically when a cooling cycle begins. Conversely, the “on” mode means that the fan will run continuously, whether or not the system is cooling. Let’s take a closer look at these settings and when you should use them.
When does the air conditioner fan turn on?
Your air conditioner has a blower motor inside that forces the air out and through the ductwork to deliver cool air to all of the rooms in your home. The fan setting controls when this blower is on. When it is set on “auto”, the fan turns on ONLY when your system is running.
Why does my air conditioner run when the AC is not on?
Running the fan on an air conditioner without the cool air turned on can actually have the opposite effect a reducing humidity. Leaving the fan running when the AC is not running is a sure way to increase the moisture in the air because any moisture in the system will evaporate and distribute back through your house.