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Why Isnt My AC Unit Turning On?
Posted On: May 17, 2024
If your AC unit isn't turning on, there could be several reasons, ranging from simple issues that you can fix yourself to more complex problems requiring a professional technician. Here are some common causes and potential solutions:
Basic Checks
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Power Supply
- Check the Circuit Breaker: Ensure the circuit breaker for the AC unit is not tripped. Reset it if necessary.
- Power Switch: Verify that the power switch near the AC unit (usually outside) is turned on.
- Fuse Box: Check for any blown fuses and replace them if needed.
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Thermostat Issues
- Correct Settings: Make sure the thermostat is set to "cool" and the temperature setting is below the current room temperature.
- Battery Check: If your thermostat uses batteries, check if they need replacing.
-
Remote Control Issues
- Battery Check: Ensure the remote control batteries are not dead.
- Proper Functioning: Verify that the remote control is working correctly by testing it on another device, if possible.
Common Problems and Solutions
-
Clogged Air Filter
- Replace the Filter: A clogged filter can restrict airflow, causing the AC to shut down. Replace the air filter if it looks dirty or hasn't been changed in a while.
-
Blocked Condenser Unit
- Clear Debris: Ensure the outdoor condenser unit is free of debris, leaves, and dirt. Clear away any obstructions that might be blocking airflow.
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Drain Line Issues
- Check for Blockages: The condensate drain line could be clogged, causing the unit to shut off. Clear the drain line if you notice any blockages.
Technical Issues
-
Capacitor Failure
- Professional Check: The capacitor helps start the AC’s motor. If it’s faulty, the unit won’t turn on. This usually requires a professional to diagnose and replace.
-
Compressor Problems
- Listen for Noises: If the compressor is failing, you might hear unusual noises when the AC tries to start. This often needs professional attention.
-
Refrigerant Levels
- Check for Leaks: Low refrigerant levels due to a leak can prevent the AC from working. A technician can identify and fix leaks and recharge the refrigerant.
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Faulty Wiring or Connections
- Inspect Wiring: Look for any obvious signs of damage or loose connections in the wiring. This can be dangerous, so consider consulting a professional.
When to Call a Professional
- Persistent Issues: If basic troubleshooting doesn’t solve the problem, it’s best to call a professional HVAC technician.
- Electrical Components: For issues involving capacitors, compressors, or wiring, professional diagnosis and repair are recommended due to the risk of electrical shock or further damage.
By methodically checking these potential issues, you can often identify the cause of your AC unit not turning on. However, for complex problems or if you're unsure, professional help is the safest option.
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See What Our Customers Are Saying:
Aug 8, 2025
We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
Aug 8, 2025
Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!
Feb 18, 2025
Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.
Feb 18, 2025
We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!
Feb 18, 2025
TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!
Feb 18, 2025
Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!
Feb 18, 2025
Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.
Aug 17, 2024
I returned from vacation to find my AC unit on the Fritz. After calling way too many places I connected with TwinTech. Ive used the company in the past for my furnace so I was happy when I recognized Greg at my front door. Hes great and the service is always top notch. Id highly recommend using twintech for honest, superior service in the Durham region. Thanks!
Aug 13, 2024
I called Twin Tech when my air conditioning stopped working. Greg came over to diagnose the issue - the same day. He was able to diagnose the issue and resolve it quite quickly. Although it was a quick fix, Greg was very thorough in explaining the issue and provided great advice. Not to mention, I felt very comfortable having Greg in my home - which I consider very important when hiring a service provider. Twin Tech will be my go-to from now on. Thank you!!
Aug 12, 2024
Just hired TwinTech Heating & Cooling to do an A/C Unit removal & reinstall to allow for landscaping access on the side of my house, and they were wonderful!
Bob, Greg & Mitch make a great team! Quick appointment times, super knowledgeable, expert troubleshooting capabilities & very customer service oriented.
I would highly recommend them for all of your HVAC needs! Great job guys!!
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