A heating or cooling system that won't turn on can quickly become a frustrating issue, especially in extreme weather. Whether your AC is not turning on, your thermostat is set to cool but AC is not turning on, or your outside AC unit is not turning on but the inside is, there are several possible causes. Below, we'll cover common reasons for these HVAC failures and steps you can take to resolve them. If troubleshooting on your own doesn't resolve the issue, Bardi is here to help with expert HVAC repair services.
Check the Thermostat First
If your thermostat is not turning on the AC, start here before assuming there's a mechanical failure. The thermostat acts as the command center for your system, so if it's malfunctioning, your AC won't receive the signal to start.
Make sure the thermostat is set to cool and the temperature is lower than the current room temperature. If your thermostat operates on batteries, try replacing them to ensure they are not the issue. If the display is blank, it may indicate a power problem, so check whether the thermostat is hardwired or battery-powered. If it is hardwired, inspect the breaker panel to ensure the circuit has not been tripped.
Circuit Breaker and Power Supply Issues
A tripped breaker is a frequent reason why an HVAC system is not working.
- Locate your home's electrical panel.
- Inspect the panel to check if a breaker has been tripped.
- If a breaker is tripped, reset it by flipping it off and then back on. If the breaker trips again immediately, there may be an electrical short that requires professional inspection.
- Check for a power switch near the indoor HVAC unit that resembles a standard light switch.
- Ensure the HVAC power switch has not been accidentally turned off.
Outside AC Unit Not Turning On But Inside Is
If you notice that the inside system is blowing air, but the AC compressor is not turning on, this usually indicates an issue with the outdoor unit.
Start by checking the emergency shut-off switch located near the outdoor unit to ensure it has not been turned off. Inspect the wiring around the outdoor unit for any visible damage, such as frayed or disconnected wires, which may be preventing power from reaching the compressor. Listen for clicking or humming sounds from the outdoor unit, as these noises could indicate a problem with the capacitor or relay. If the fan inside the outdoor unit is not spinning, the capacitor may be defective and require replacement. Since handling electrical components can be dangerous, it is advisable to call a professional to diagnose and fix capacitor-related problems.
AC Fan Not Turning On
When the AC fan is not turning on, but the unit has power, there are several potential causes.
One possibility is that the fan motor has worn out over time and is no longer functioning properly. The capacitor, which helps start the fan, could also be failing, preventing the fan from spinning. Sometimes, debris such as leaves or dirt can become lodged in the fan blades, blocking movement. If you suspect a blockage, turn off the power and carefully inspect the fan for obstructions. To test whether the fan motor is seized, you can try gently pushing the fan blades with a stick. If they do not move freely, it is likely that the motor needs to be replaced.
Why The Heat Won't Turn On
If your heat won't turn on, the problem could stem from similar power-related issues as an AC unit, but additional troubleshooting may be required.
- Ensure the thermostat is set to heat mode.
- Adjust the thermostat temperature higher than the current indoor temperature.
- If you have a gas furnace, check if the pilot light is lit. If the pilot light is out, follow the manufacturer's instructions to relight it safely. For electric furnaces, inspect the breaker panel and reset any tripped breakers.
- Check the furnace filter for dirt or clogs.
- Replace the filter if it appears dirty to prevent overheating and safety shut-offs.
Furnace Won't Turn On But Fan Works
When the furnace won't turn on but the fan works, this suggests that the blower is operational, but the heating components are not functioning.
If your furnace runs on gas, check whether the gas supply is active by testing other gas appliances in your home. A dirty flame sensor can also prevent the furnace from igniting, so cleaning it gently with fine-grit sandpaper may resolve the issue. If the ignitor has failed, it will need to be replaced, which should be done by an HVAC professional to ensure safe installation.
What to Do If Your AC or Furnace Still Won't Turn On
If you have checked all of these common issues and your HVAC is still not working, it may be time to call a professional. Problems such as refrigerant leaks, compressor failures, or electrical shorts require specialized expertise and tools to diagnose and repair. The experienced technicians at Bardi can quickly assess and repair your HVAC system, ensuring your home stays comfortable year-round.
Preventative Maintenance Tips
To prevent sudden system failures, regularly replace air filters every one to three months to reduce strain on the HVAC system. Scheduling professional HVAC inspections before the start of cooling and heating seasons can help identify potential issues before they become major problems. Keeping the outdoor unit free from debris ensures proper airflow and prevents overheating. Testing your thermostat periodically will confirm that it is accurately reading the temperature and properly signaling the HVAC system.
If troubleshooting steps do not resolve the issue, contacting an HVAC professional can help prevent further damage and ensure that the system is repaired correctly. In some cases, if your system is old and frequently experiencing failures, replacing it may be a more cost-effective solution in the long run. Regular maintenance and addressing minor issues early can extend the life of your HVAC system and keep it running efficiently throughout the year.
Need help with your HVAC system? Contact Bardi today to schedule a service appointment. Our experts are ready to diagnose and fix any issues to get your heating and cooling system back up and running quickly.
Frequently Asked Questions
How do I fix heating and air conditioning issues?
The first step in fixing heating or air conditioning problems is to check the thermostat settings and power supply. Ensure the thermostat is set to the correct mode and the temperature is appropriately adjusted. If the unit is not receiving power, inspect the circuit breaker and reset any tripped switches. Cleaning or replacing air filters can also help improve airflow and prevent system failures. If these steps do not resolve the issue, contacting Bardi for a thorough inspection is recommended.
How do I open the heating and air conditioning control panel?
Most HVAC control panels are secured with screws or clips that need to be removed before accessing internal components. Before opening the panel, always turn off the power to the unit at the breaker to avoid electrical hazards. Once the panel is open, be cautious when handling wires or circuit boards, as improper handling can cause further issues. If you are unsure about accessing the control panel, consult a professional at Bardi to avoid damage or safety risks.
Why is my AC not turning on?
There are several reasons why an air conditioner may not turn on. The thermostat could be set incorrectly, the circuit breaker may have tripped, or there could be an issue with the power supply. A clogged air filter can also cause the system to shut down as a safety measure. Additionally, issues with the capacitor, compressor, or wiring may prevent the AC from starting. If basic troubleshooting steps do not resolve the problem, it is best to have a Bardi technician diagnose the issue.
Why is my AC compressor not turning on?
A non-functioning AC compressor is often due to electrical issues, such as a failed capacitor, faulty wiring, or a tripped breaker. Low refrigerant levels can also cause the compressor to shut down as a protective measure. Additionally, if the compressor has overheated, it may need time to cool before restarting. If the compressor continues to fail, professional assistance from Bardi is required to determine whether it needs repair or replacement.
Need expert HVAC help? Contact Bardi today for fast, reliable service!
