The Carrier 58STA090 furnace does not have one central, universal "reset button". Instead, it uses safety limit switches and a power switch to reset.
On many Carrier models, the reset button is on or near the blower motor housing or within the burner compartment. It's often red or yellow for easy identification. Once you've located it, press the reset button once and wait a few minutes to let the system restart.
Resetting a Carrier furnace is typically done by performing a system power cycle (rebooting the control board). In some cases, you may also need to manually reset safety limits or the blower motor.
To reset an AC, leave it completely powered down for 15 to 30 minutes. This gives the system’s electrical circuits time to fully reboot and allows refrigerant pressures to equalize so the compressor doesn't fail to start.
To reset a Carrier air conditioner without a dedicated reset button, perform a hard power cycle. Turn off the AC at your thermostat, switch off the dedicated HVAC circuit at your main electrical breaker box, wait at least 1 to 5 minutes, and then turn everything back on.
The reset button for your HVAC system depends on the component you are trying to reset. Typically, it is either a dedicated red or yellow reset button located on your outdoor condenser or indoor furnace/air handler, or you can perform a system reset using your main electrical panel or local shut-off switch.
Locate and press the AC unit's reset button: Many AC units feature a reset button near the outdoor unit. Pressing this button can reset the system and potentially resolve minor issues. Locate the reset button and give it a try if your AC unit will not turn on.
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.
To reset a furnace without a dedicated reset button, power cycle the system by turning off the furnace's dedicated circuit breaker in your home’s electrical panel for at least 30 to 60 seconds before turning it back on. Alternatively, flip the power switch located on or near the furnace unit, or adjust the thermostat to "off" and then back to "heat".
A furnace may stop working due to issues like a tripped circuit breaker, dead thermostat batteries, clogged air filters, pilot light or ignition problems, gas supply issues, or a dirty blower or burners. It can also happen if the limit switch trips due to overheating.
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".
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 a furnace repeatedly requires resetting, it is usually triggering a built-in safety mechanism to prevent damage or fire. The most common culprits are restricted airflow (like a dirty filter), a dirty flame sensor, or a clogged condensate drain (in high-efficiency units).
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.
Pushing the reset button on a thermostat clears errors and restores communication with your HVAC unit. However, depending on the type of reset, it will usually erase all custom schedules, temperature settings, and Wi-Fi configurations.
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.
When a Carrier furnace won’t turn on, start by checking the power switches, thermostat, and air filter. Most no-heat issues are caused by tripped breakers, dirty filters, or a loose front panel door.
Resetting can recalibrate the temperature sensor. Failure to Turn On HVAC System: A thermostat reset reboots its system and attempts to restart normal functioning. This resolves problems where it fails to turn on your AC, heat, or fan.
Before calling a Carrier dealer for in-home services or repair, check your thermostat to make sure the system hasn't been turned off. Then, check your electrical panel to be sure a blown fuse isn't the culprit or the circuit breaker hasn't tripped. Also, check air filters for excessive dirt or clogging.
On a Carrier air conditioner, the physical reset button is usually located on the front panel of the indoor air handler (near the control display) or as a red/black button on the outdoor condenser unit near the control box or compressor.
No. Running a furnace with a malfunctioning limit switch can be dangerous because it may allow the furnace to overheat, potentially causing damage to the system or creating a fire hazard. If you suspect a faulty limit switch, it's crucial to turn off the furnace and schedule a professional inspection immediately.