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Air Conditioner is Humming but Not Turning On
Posted On: April 6, 2024
If your air conditioner is humming but not turning on, there could be several possible reasons for this issue.
Here's a troubleshooting guide to help you identify and potentially fix the problem.
If your air conditioner is humming but not turning on, there could be several possible reasons for this issue. Here's a troubleshooting guide to help you identify and potentially fix the problem:
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Check the Power Supply: Ensure that the air conditioner is receiving power. Check the circuit breaker or fuse box to make sure the circuit hasn't tripped or the fuse hasn't blown. If it has, reset the breaker or replace the fuse.
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Thermostat Settings: Make sure the thermostat is set to cool and that the temperature setting is lower than the current room temperature. Sometimes the thermostat might be set incorrectly, preventing the air conditioner from turning on.
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Dirty Air Filters: Clogged or dirty air filters can restrict airflow, causing the system to malfunction. Check and replace the air filters if necessary. Clean filters can improve airflow and efficiency.
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Blocked Vents or Registers: Ensure that all vents and registers are open and not blocked by furniture, curtains, or other obstructions. Restricted airflow can hinder the performance of the air conditioner.
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Condensate Drain Line: Check the condensate drain line for clogs or blockages. If the drain line is obstructed, it can cause water to back up and trigger a safety switch that prevents the system from turning on.
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Capacitor Issues: The capacitor is a component that helps start the compressor and fan motors. If the capacitor is faulty or has failed, it can prevent the air conditioner from starting. A professional HVAC technician can test the capacitor and replace it if necessary.
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Faulty Compressor: If the compressor is not functioning properly, it can cause the air conditioner to hum but not start. Compressor issues often require professional diagnosis and repair.
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Electrical Problems: Faulty wiring or electrical connections can also prevent the air conditioner from turning on. It's best to have an HVAC technician inspect the wiring and connections for any issues.
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Low Refrigerant Levels: Low refrigerant levels can indicate a leak in the system, which can prevent the air conditioner from cooling effectively. If you suspect a refrigerant leak, it's essential to contact a professional HVAC technician to locate and repair the leak and recharge the refrigerant.
If you've checked these common issues and the problem persists, it's best to contact a qualified HVAC technician to diagnose and repair the problem. Attempting to fix complex HVAC issues without proper training and equipment can be dangerous and may cause further damage to the system.
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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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