Typically, you'll find it inside the air handler, either next to or above your furnace. In most newer systems, the button is often directly next to the blower motor, while in older systems, it may be harder to spot as it is sometimes underneath or behind the motor.
Use the Furnace's Power Switch
Most furnaces have the switch on the exterior of the metal cabinet that contains the blower unit. Push the switch to the off position. Wait for two to three minutes, then turn it on again. If your furnace still won't respond, proceed to the next step.
Find the Reset Button – you will then need to find the furnace reset button, which is typically located inside the blower compartment, positioned on the side of the blower motor. Press the Reset Button – If the reset button has popped up, you will need to press it down to reset the furnace.
Find the 'limit switch'
Once you've opened the control panel, search for a red or yellow elevated switch or button near the ignition control box. Now all that is left is to push and release the limit switch to reset your furnace manually.
In AC systems, the air conditioner reset button is on the outside unit's lower edge, typically close to the ground. Some models have the reset button located behind the service panel, which may require tools to remove. Reset buttons are usually red or yellow with a clear “reset” label.
In most newer systems, the button is often directly next to the blower motor, while in older systems, it may be harder to spot as it is sometimes underneath or behind the motor. The reset button is often made of yellow or red plastic and marked with a large “R ” to make it easier to spot.
Not all air conditioning units have a reset button, but if yours does, it's typically located on the outdoor unit. Here's how to locate it: Turn Off the Power: Before you search for the reset button, ensure the power to the unit is turned off for safety reasons.
If your furnace fan won't turn off, you most likely have one of these 3 problems: Your furnace fan limit switch is set to “manual override” The fan limit switch is faulty and needs to be replaced. There's a problem in your thermostat wiring.
You may need to turn off the switch mounted on or near the furnace, or you may need to turn off the circuit breaker. After waiting for about 10 seconds, turn the power back on and check if the furnace regains power.
Most blower motors are controlled by a red or black switch on the side of the unit. Hold the button down for a few seconds (the manual will tell you precisely how long), then release. Replace the Panel and Restore Power.
When this happens, there's usually something wrong with either the blower motor itself or with another part of your furnace that controls it. Problems include dirty filters, broken wires, poor voltage supply and faulty limit switch or capacitor.
First of all, be aware that not all furnaces have a reset button; however, most do. If your electric furnace has one, it's most likely located within the blower housing, next to the motor. If you own a gas furnace, it's probably located within the control panel. Check your owner's manual for specifics.
If you suddenly hear loud and strange sounds like squealing or grinding, these are symptoms of a bad furnace motor blower that can signal signs of motor bearing problems or a damaged belt in older belt-driven models. Repairs may be possible or it may be time to replace the blower motor entirely.
Check Your Furnace Air Filter
Next, check your heater's air filter, as this can cause a furnace to stop blowing air. Your filter could be so saturated with dust and debris. In that case, even though the furnace is actually blowing air, your clogged filter is blocking it from making it into your ducts.
Most furnaces have a reset button near the blower compartment itself, though the exact location may vary depending on the make and model. It's usually red or yellow and small in size. Consult your furnace manual for guidance if you're unsure where it is.
The most common cause of a furnace fan running continuously is that the blower setting on your thermostat is set to “on.” This means that the fan will run constantly as long as there's electric power. This will happen regardless of whether or not your furnace is actually heating.
Sounds as if you have a shorted wire. A lack of 24volts will cause the motor to run continuous in some units. An open high limit [as stated in a previous post] will cause the blower situation as well. Check for voltage across R and C at the furnace thermostat terminals, should have 24 volt.
First, turn off the power supply to the furnace by turning off the breaker in the circuit box. Locate the reset button on the furnace and press it to reset the furnace. It is usually located inside the blower compartment on the side of the blower motor. Be cautious, as the housing may be hot.
Let's take a look. Problem 1: Incorrect thermostat settings The most common reason for a furnace fan that won't shut off or a furnace blowing cold air and won't shut off is the wrong thermostat settings. The solution: Check the thermostat settings. The fan setting should be on AUTO.
To find the limit switch on your furnace, look for a red, yellow, or white button on the panel. To restart your furnace manually, hold this button for three seconds before releasing it. After restarting the system, affix your control panel back on the furnace and turn your furnace back on via the circuit breaker.
Look for it first around on the exterior of your machine, especially along the bottom edge near the ground. An AC's reset button is typically red and visible, so it should be easy to spot. If you don't see a reset button on the outside, it could be located inside the unit behind the service panel.
Shut off your system by hitting the isolation switch, wait 30 to 60 minutes and then turn it back on. This manual reboot fully disconnects your AC unit from power, allowing all electrical components to reset.
If your AC still won't turn on or doesn't have a reset button, you can reboot it via the isolation switch. The central role of an AC isolator is to disconnect the power supply to the unit in case of unusual electric current or when the unit malfunctions. You can find it on the wall beside the unit or at the condenser.