$49 / month O.A.C Including Install
$49 / month O.A.C Including Install

Air Conditioner is Humming but Not Turning On

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Air Conditioner is Humming but Not Turning On

Posted On: April 6, 2024

Air Conditioner is Humming but Not Turning On

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:


  1. 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.


  2. 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.


  3. 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.


  4. 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.


  5. 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.


  6. 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.


  7. 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.


  8. 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.


  9. 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:

by DG Sellers on Twintech Heating and Cooling

Professionally done and took care to cover all entry floors to the house for the installers to remove the old furnace and install a new furnace.
I also made recommendations of the tankless water heater that we had installed and items to address. We did not know they also installed tankless water heaters.

by Bill, Pickering on Twintech Heating and Cooling

Price was not the cheapest nor the most expensive of my quotes. It's the quality of the installation that makes for a good AC system. The twins' knowledge & professionalism was evident in the small details:
Very clean work. Greg made sure that the refrigerant level & temperature were correct. They reinstall the insulation & vapor barrier around the wall. The outside electrical cords were secured to the wall. Proud to support this local company. Thank you.

by Taz on Twintech Heating and Cooling

Great team of guys came to do the work. Very professional. Arrived on time worked very efficiently and were very clean. They answered any questions we had without hesitation. The air conditioner works great and is so quiet. I highly recommend them and they don't try to up-sell anything right from the start.

by Jordan on Twintech Heating and Cooling

The service was prompt, professional and very courteous. Competitive price. Would highly recommend this company.

by David on Twintech Heating and Cooling

Excellent workmanship, and quick response. Would recommend Twintech to anyone.

by Todd Whyte on Twintech Heating and Cooling

My existing 15-yr old A/C went down on me during the first major heatwave of the season. Researched my options, as well as a few different installers, and decided on Twintech.

They gave me confidence right from the beginning. Extremely knowledgeable. Their communication was excellent - always responded to questions quickly. Given we were in a heatwave, they were fully booked. However, within days they were able to fit me in due to a cancellation. Upon learning that the Amana unit I was getting installed was on backorder, TwinTech went to bat for me with the manufacturer and was able to get me the next model up within a day, for the same price - Amazing!

As far as the installation was concerned, I couldn’t be more impressed. These guys were clearly very experienced and did a fantastic job. Very clean, polite, timely & informative. They even thoroughly sealed all the exposed gaps in my ductwork. I’ve had plenty of heating and cooling work done in the past and have never used the same contractor twice because I’ve never been very impressed. However, from now on, I’ll always be contacting Twintech first!

by Jordan Arnott, Courtice on Twintech Heating and Cooling

They were very friendly and took care of everything. The install looks great (and works great), they were very knowledgeable. Installed our a/c efficiently despite the difficult install location both inside and outside and they made it work.

by Lori Ellis on Twintech Heating and Cooling

Phenomenal service, so glad I found these guys a few years back after being "hosed" badly by 3 other companies. I've recommended them to so many, and they all are so thankful.

by Jonathan Rogoza on Twintech Heating and Cooling

This company is fantastic. Dave came out and gave me a very honest and reasonable quote, unlike a quote received from another company. I had a bunch of questions that were easily answered and when I had questions regarding heating/cooling a previously unheated room above the Garage, Dave arranged for Greg to come out for an assessment of this new space and gave me his recommendation along with his professional thoughts on all of my options.

These guys have been nothing but Professional, honest and helpful along the way. I can't recall the two other guys doing the install, but they were great as well. Good workmanship, everything was cleaned up and everything functions as promised. I could go on and on about my experience, but it's all positive so what more could you want?

Give them a call, see for yourself. If I had to buy another furnace/AC or heat pump, they'd be my first call.

by Private User on Twintech Heating and Cooling

I hired twin tech to convert my townhouse heating from electric to gas and install a furnace and a/c unit. I had talked with many other vendors, and received several quotes, but chose them, and very happy I did. Here are some of the reasons why:
1. They were realistic about the timeline for the work, when they could start and how long it would take. (They said upfront, it was their busy season and would need to get back to me in 3 weeks, which they did):
2. They had a quote with options for me. They were clear about the entertainment of what they would and would not do (they’d build duct work, id need another contractor to box in ductwork). This allowed me to plan as I was my own general contractor for my renovations).
3. They spoke to me in a language I understood, neither too technical nor too simple. They answered all my questions as I had them. Everyone is so lovely to work with, the sales team and the contractors who are worked in my home.
4. It’s been 4 m since the work was complete. They still answer my emails and my furnace is working very well!

I unabashedly recommend! Price, customer care and quality workmanship were all amazing!

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See What Our Customers Are Saying:

by Aaron on Twintech Heating and Cooling

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.

by Linda on Twintech Heating and Cooling

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!

by Robert Rogers on Twintech Heating and Cooling

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.

by Robert Mizuno on Twintech Heating and Cooling

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!

by Ruth on Twintech Heating and Cooling

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!

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