Carrier furnaces typically have a small reset button inside the burner compartment. It may be red or yellow and is usually labeled “Reset.” If you're unsure where to find it, consult your furnace's user manual. Hold the button down for about 10 seconds before releasing it.
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.
To restore the power to a furnace not working after power outage, locate the breaker box to reset the unit. Turn the circuit breaker switch off, wait about 30 seconds, then flip the switch back on and test the furnace. Resetting a GFCI outlet is slightly trickier.
The Furnace Needs a Rest
Simply go to your breaker box, switch the breaker off, wait 30 seconds, and turn it back on. Next, If you have a gas furnace, shut off the unit's pilot light and wait until the gas disperses. Finally, push the furnace's reset button to restore its power and operations.
Replacing your thermostat's batteries can often fix your HVAC problems. Safety reset functions: Like many electrical devices, thermostats use safety reset functions that trigger when there's a power surge. Try turning your thermostat's power supply off for 30 to 60 seconds, then turning it back on.
Carrier thermostat won't turn on
If your thermostat has a blank screen, it's likely due to a power issue. Check your electrical box and reset the circuit breaker. If you have a fuse box and the fuse has blown, replace it. Check the switches connected to your thermostat, furnace, and air conditioner.
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.
Steps to Reset Your Furnace
If you can't find a switch at the furnace you can turn off the circuit breaker to the furnace at the main circuit breaker box. Wait about 10 seconds. Turn the switch or breaker back on and check the furnace to see that it has power again.
Identify the Blower Motor: Look for a cylindrical component with wires connected to it. Find the Reset Button: The button is usually on or near the blower motor housing. Press and Hold the Reset Button: Press the reset button firmly and hold it for 5 to 10 seconds. This allows the furnace to reset properly.
Wait 5 to 10 Minutes
Once you've turned off both the power and the circuit breaker, wait a few minutes before turning anything back on. This allows the furnace's internal systems to fully reset and clear any error messages or lockout modes.
A furnace may not kick on due to several issues: a tripped circuit breaker, a faulty thermostat, a clogged air filter, a blocked or obstructed return-air or supply-air grilles, a malfunctioning ignition system, a broken flame sensor, or on older models, issues with the furnace's pilot light.
Be sure to wait for 30 minutes, as your air conditioning system will need some time to reset before you can turn it back on completely. Once the 30-minute mark has passed, you can go to your thermostat and turn your air conditioner back on from there.
When the home's electrical system loses power, the thermostat loses the power it needs to operate normally. The display will remain blank for the duration of the outage. Check other appliances and lights in your home. If they are also out, you can confirm an outage is the culprit.
If you notice your AC not working after a power outage, in most cases, the breaker has tripped or the system has built-in brownout and blackout protection. Reboot the AC by turning it off at the thermostat, resetting the circuit breaker, and waiting 30 minutes to turn the AC on again.
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.
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.
Reset button—The furnace can also trip its reset button when there is a power outage. It's usually a red or yellow button located inside the blower compartment near the motor. When it's tripped it pops up. Push and hold the button for a few seconds.
Check the circuit breaker or fuse box to ensure the furnace is getting power and hasn't tripped a circuit breaker. Check the pilot light if you are using an older furnace. If the pilot has gone out, follow your owner's manual for further instructions. Check to ensure that the gas supply is still on.
Why is there no power to a boiler after a power cut? When we experience a power cut, the thermostat and the timer clocks will reset to their original settings. This means that the boiler won't turn on and off at the right times, and consequently, your heating won't kick in.