Not all furnaces have the same type of reset switch. While most traditional gas, oil, and electric furnaces feature an emergency power switch (often resembling a standard wall light switch) and a manual safety reset button on the blower motor, some modern systems lack a dedicated physical reset button entirely, relying instead on circuit breakers and digital error controls.
Your furnace’s reset button is typically a small, bright red or yellow button located either inside the blower compartment, near the burner assembly, or directly on the motor housing.
All furnaces are equipped with a reset button. They are generally red or yellow and are located inside the blower compartment. The reset button is a safety feature that will shut down the furnace when a problem is detected, often a hot or overheating furnace, before it trips the circuit breaker.
To get your furnace to kick on, first verify your thermostat is set to "Heat" and raised at least 5 degrees above room temperature. Next, check that the furnace power switch (usually resembling a standard light switch on or near the unit) is toggled "ON".
Pressing the reset button on your furnace can be safe when done properly, but it should be approached with caution. After pressing the button, give the unit a few seconds to reset and begin running again. If the furnace doesn't start up after pressing the reset button, you can try pressing it one more time.
If it doesn't start at all, you can press the button one more time. But, if you press the reset button and your furnace goes on and turns off again, don't press the button again. Continuing to press the reset button can damage your system. Doing so will pump more oil into the furnace and worsen any existing issues.
The heat exchanger is often considered the most costly part of a furnace to repair or replace. It is a critical component that transfers heat from the combustion process to the air that circulates throughout your home. Over time, heat exchangers can crack due to the constant heating and cooling cycles they undergo.
When your furnace fails to turn on automatically, the fastest solutions are checking the thermostat (ensure it is set to "Heat" and increase the target temperature by at least 5∘5 raised to the composed with power5∘), checking the circuit breaker to ensure it hasn't tripped, and inspecting your air filter for clogs.
The $5,000 rule is a guideline to help homeowners decide whether to repair or replace their HVAC system. You multiply the age of your unit by the cost of the needed repair. If that number exceeds $5,000, replacing your HVAC system is often more cost-effective.
The manual reset process takes only 30 seconds to 3 minutes to flip the power off and on. However, after power is restored, it takes the furnace about 5 to 15 minutes to complete its safety checks, ignite the burners, and start blowing warm air.
Below, we've explained the top signs your furnace needs repairs or replacement.
The reset button on a furnace blower motor is a small, usually red or yellow button located directly on the motor casing or on an adjacent safety limit switch. It is a safety device designed to trip and shut down the blower motor if the system experiences an electrical surge or severe overheating.
To reset your furnace, start by turning off the circuit breaker and furnace power, wait about 30 seconds to a minute, then turn the power back on. If your furnace uses gas, you may also need to turn off the gas for a few minutes before turning it back on.
If your furnace fan won't turn on, first check your thermostat to ensure it’s set to "Heat" and the fan mode is on "Auto." Next, verify that the furnace is receiving power by checking the circuit breaker and ensuring the safety door panel is tightly closed.
If your thermostat lacks a menu or reset button, you can usually reset it by turning off the power to your HVAC system at the circuit breaker for about 30 seconds to 1 minute. This power cycle acts as a soft reset. Some models also allow you to remove the batteries for a few minutes to reset internal settings.
A standard furnace lasts between 15 and 20 years on average, though electric furnaces can stretch up to 20 to 30 years. Regular maintenance, such as annual tune-ups and changing your filters every 1 to 3 months, is the most important factor in reaching or exceeding this lifespan.
However, with the passage of the new budget, homeowners now have until the end of 2025 to take advantage of the HVAC tax credits, which include: $2,000 for a qualified heat pump. $600 for a qualified air conditioner. $600 for a qualified gas furnace.
The "two-foot rule" in HVAC is a duct design and installation guideline that requires a minimum of 24 inches of straight, uninterrupted space between branch take-offs (where air taps off the main trunk). It is also applied to spacing branches away from end caps, transitions, and the main plenum.
To get your furnace to kick on, first verify your thermostat is set to "Heat" and raised at least 5 degrees above room temperature. Next, check that the furnace power switch (usually resembling a standard light switch on or near the unit) is toggled "ON".
You may feel this is the easiest and most harmless step, but the reset method is not the same for all types of systems, and it is not right to reset your system frequently. If you face the same problem more than once or twice, do not reset your system every time. It will damage your furnace.
Signs of a failing control board include the furnace not starting, the blower fan running nonstop, flashing error codes on the unit, and the system not responding to the thermostat.
What fails first on a furnace? The most common early failures are the furnace ignitor or flame sensor, as they experience regular wear and tear and are critical to starting the heating cycle.
Homeowners insurance may cover the cost to repair or replace your furnace or boiler if it's damaged or destroyed by a covered peril. Covered perils as defined by your policy typically include events such as: Lightning. Fire.
The national average cost for replacing a gas furnace in the U.S. for a 1,600 to 2,000-square-foot home is about $7,000. However, the cost of furnaces can range widely depending on their size, type, and efficiency, and homeowners can generally expect a new furnace to cost anywhere between $3,800 and $10,000.