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.
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.
Switch the thermostat to the off position. Locate the breaker that powers your HVAC system and turn it off. Wait 30 seconds and turn the breaker back on. Turn your thermostat back on and confirm it has reset properly.
If You Don't Have a Reset Button on Your Outdoor Unit
Unplug the unit from the power supply board and disconnect the system. This ensures that the AC unit is receiving no power whatsoever. Wait 30 minutes, then plug the unit back in.
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.
It's a small, red button usually located on or around the unit. The button should have a clear 'reset' label. Once you find the button, press it for around three seconds and observe the AC. Check whether the AC kicks on immediately and if it doesn't, press the button again for another three seconds.
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.
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.
Follow these instructions to reset your boiler:
First, find your boiler manual. Some boilers don't have an obvious reset button, or may have different instructions to the ones below. Find your reset button, and push it for 10 seconds. Wait 2 to 3 minutes, then turn on the heating or hot water.
Checking your thermostat is the best place to start. Make sure it's set to “heat” and that you've set the temperature higher than the current room temperature. If that doesn't resolve the problem, try switching your fan to “on” to force the furnace to start working.
Leave the breaker(s) off for at least 10 minutes while the system is off and “rebooting.” After 10 minutes have elapsed, go back to the breaker box and flip the HVAC breaker(s) back on.
Check your circuit breakers: Reset any tripped breakers. Check your fuel supply: If you don't smell gas in the home, try another gas appliance (e.g., your stove). If it won't ignite, chances are it's a supply issue. Check your air filter: Regularly change your air filter.
There are several reasons why your furnace may not turn on. The most common include a broken thermostat, gas line issues, clogged air filters, blocked ductwork, a tripped circuit breaker, and issues with the furnace itself.
Turn the Isolation Switch
It should look like a dial with an “on” and “off” position. 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.
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.
Most modern thermostats will have a clearly marked reset button inside the panel. It's usually small and recessed, so you might need a pointed object like a paperclip to press it. For those wondering specifically how to reset air conditioner thermostat models, the process is generally the same.
It's normal for the reset button to trigger occasionally, and that actually means it's serving its function. However, if you find yourself frequently resetting a tripped furnace, chances are the problem is from a malfunction.
Gas Furnace - The emergency switch is typically a red switch located on or near the furnace unit. It may be mounted on the side of the furnace or on a nearby wall. Heat Pump - The emergency switch for a heat pump is typically a red switch located near the outdoor unit. It may be on the unit itself or on a nearby wall.
You can reset the system by locating the isolator switch often on the outdoor unit. It is typically a lever on a V-shaped socket near the condenser.
Reset Your Circuit Breaker
Identify the electrical panel—frequently found in the garage, basement, crawlspace or utility closet—and look for the switch for your HVAC system. If the circuits aren't labeled, you might have to try things out. Turn the circuit breaker off, wait 30 minutes, and then flip it back on.
Steps To Follow While Resetting Air Conditioner
One wrong step can cause greater damage. For this reason, follow a pattern while resetting your AC. Some ACs come with a reset button, while some don't. Most of the split AC systems have a reset button.