Why is my aircon not turning on?

Aircon trunking

If your aircon isn’t turning on, it can be frustrating—especially during hot weather. There are several possible reasons why this could happen, ranging from simple issues like a tripped circuit breaker to more serious mechanical or electrical problems. Here's a breakdown of some of the most common causes and what you can do about them.

1. Power Supply Issues

Before diving into more complex problems, always start with the basics: check the power supply.

• Tripped Circuit Breaker: The aircon draws a lot of power, and if there’s a surge, it might trip the breaker. Go to your breaker box and see if the switch connected to the aircon has flipped. If so, reset it.

• Blown Fuse: In older systems, or homes with fuse boxes, a blown fuse could cut power to your aircon. Replacing the fuse may solve the issue.

• Power Switch: Sometimes the power switch on or near the indoor or outdoor unit might be turned off. Double-check that all necessary switches are turned on.

2. Thermostat Problems

Your aircon system relies heavily on the thermostat to know when to turn on and off. If there's an issue with the thermostat, your AC might not power up at all.

• Dead Batteries: If your thermostat runs on batteries, they might be dead. Try replacing them. View more

• Incorrect Settings: Make sure the thermostat is set to "cool" and that the desired temperature is lower than the room temperature.

• Faulty Thermostat: If the screen is blank or unresponsive, the thermostat itself might be malfunctioning and may need repair or replacement.

3. Clogged Air Filters

Believe it or not, something as simple as a dirty air filter can prevent your system from working properly.

• If the filter is clogged, it can cause the system to overheat or trigger a safety shutoff.

• Airflow restrictions can also prevent the indoor unit from turning on even if the outdoor unit seems fine.

Changing your air filters regularly (every 1-3 months) can help prevent this problem.

4. Condensate Drain Issues

Most modern ACs have a safety feature that prevents them from turning on if the condensate drain is clogged.

• If water can’t drain properly, it might trigger a float switch that shuts down the system to prevent water damage.

• Check for signs of standing water near the indoor unit or the drain pan. If it’s full, you may need to unclog the drain line.

5. Refrigerant Problems

Low refrigerant levels won’t usually stop your AC from turning on altogether, but in some cases, if the pressure gets too low, it can cause the system to shut down.

• This typically happens due to leaks in the coils or lines.

• Only a professional can properly diagnose and fix refrigerant issues, as handling refrigerant requires specific tools and certifications.

6. Capacitor or Compressor Failure

If you hear a humming sound but the aircon doesn’t start, you might be dealing with a capacitor or compressor issue.

• Start Capacitor: This is what gives the compressor the initial boost to get running. If it fails, the unit won’t start.

• Compressor: This is the heart of your aircon, and if it fails, the whole system can go down. Unfortunately, a failed compressor often requires costly repairs or replacement.

7. Wiring or Connection Issues

Over time, electrical connections can become loose, corroded, or damaged by pests.

• Look for visible signs of wear or disconnection around the indoor and outdoor units.

• Be cautious—electrical issues can be dangerous. If you suspect this might be the case, it’s best to call a professional.

8. Control Board or Internal Failure

The control board is like the brain of your aircon. If it malfunctions, it can prevent the unit from turning on at all.

• This is a less common problem, but when it happens, the entire system might become unresponsive.

• Diagnosing and replacing a faulty control board typically requires a trained technician.

Final Thoughts

If your aircon isn’t turning on, the best approach is to work through the simple possibilities first—check the power, thermostat, and filters. If nothing seems wrong, it’s wise to contact an HVAC professional. Regular maintenance can prevent many of these issues and keep your system running smoothly when you need it most.

Call: +65 90050975 (or) Whats App us: https://wa.me/6590050975

Contact Information

11 Mandai Estate, #03-09 Eldix

Singapore 729908

Mail Id: Airconaircool@gmail.com

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When it comes to maintaining your AC, deciding between general servicing and a chemical wash depends on the condition of your unit and how well it's functioning. Here’s a breakdown to help you understand which service you might need: