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

Why Isnt My AC Unit Turning On?

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Why Isnt My AC Unit Turning On?

Posted On: May 17, 2024

Why Isnt My AC Unit Turning On?

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

  1. 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.
  2. 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.
  3. 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

  1. 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.
  2. 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.
  3. 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

  1. 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.
  2. 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.
  3. 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.
  4. 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:

by Jaime-Lynne in Pickering on Twintech Heating and Cooling

Greg came over at 9:30pm to rescue my daughter and I from a horrible experience with Enercare that evening. He was professional. Kind. And got us what we needed quickly and at an afford price. I would 100% recommend calling on Greg and his team for any of your heating and cooling needs in the future!!

by Matt C. Oshawa on Twintech Heating and Cooling

Installed a great hot water heater when our old one failed. When my furnace died during cold weather they showed up quickly and my house was warm before my wife got home. :)

by B Davis in Pickering on Twintech Heating and Cooling

I don’t usually right reviews but when you receive service like this I felt it was a must. Honest and fair. I Have 4 children and on Xmas eve my furnace stopped working and a gentleman came out and got me up and running so at least we would have heat for the holidays. As promised he would replace my furnace early in the new year. The job was completed on time, great price for quality furnace and extremely clean and professional job. Would have never known anyone was in the house. Not a spec of dust or mess from lugging out an old rusty furnace. If you have any ac or heating concerns twintech is your only option. I was royally impressed with and I’m sure you will be too.

by stan.marosek from Ajax on Twintech Heating and Cooling

Class Act ! These guys were professional right from the quote stage through to installation. They know their stuff and took their time to help educate me. They take pride in their work and it shows. I would recommend TwinTech Heating and Cooling to anyone. Keep up the great work !!!

by W. Lacombe in Pickering on Twintech Heating and Cooling

This Company is terrific. No high pressure sales and they deliver exactly what they promise to deliver. The new furnace is great and we now get consistent temperatures throughout the house. The installers were great and very efficient and completed the work on schedule on the promised day. Everyone representing this company was very aware of their presence in our house and worked diligently to keep our home as uninterrupted and as clean as was humanly possible. We did not need to go around the house to clean up after they left, what a nice surprise. We have had follow up by the company to ensure everything is to our satisfaction. How unusual in today's environment. The impression left by Twintech is that they care about us and our home. This is so refreshing in today's high tech world. Out thanks go out to Dave in sales and G, G, and P (the installers).

by jiinyiong in Ajax on Twintech Heating and Cooling

They were Timely and professional. They were very Knowledgeable with answering all of my questions.

by Connie in Pickering on Twintech Heating and Cooling

The entire process was prompt and professional, from the initial quote to the installation of the new furnace. The team installed the new furnace and removed the old one in approx. 4 hrs. The guys were very knowledgeable and gave me lots of information. I have used Twintech before for a new A/C installation and new I was in good hands.

by Valentine in Pickering on Twintech Heating and Cooling

The overall experience dealing with this company was great from start to finish when getting a new furnace and ac this year. Everything was clearly explained to us during our consultation with Dave and there were no surprises with added costs. The work was done as expected and their response time to inquiries were very timely generally within a few hours or less. They are all very professional and was a pleasure to do business with them. Highly recommend to anyone looking for honest quality professional service.

by Jiri in Toronto on Twintech Heating and Cooling

From the initial contact we had an excellent experience with this company and all its personnel. Dave Gergley was an excellent, helpful, sales person and solicitous of our needs. He recommended only what was required and did not up sell or make any suggestions for products that we did not need, such as a new A.C. He explained the rebate process and basically outlined how to get the best furnace at the lowest price. When it was time for installation, the technicians could not have been more considerate, careful, attentive to detail, obviously committed to safety and optimum functioning of the appliance they were setting up. We have been perfectly satisfied with the functioning of the furnace and all aspects of acquiring it from the initial contact with Dave through to the installation process and follow ups inquiring about our satisfaction. Also they initiated the rebate process and contacted the appropriate inspection agency to carry it out. We highly recommend this company for all heating and cooling needs and we will contact them again when it is time to replace our A.C.

by Drew in Pickering on Twintech Heating and Cooling

Twintech was excellent from the initial quote and throughout the install. They had a competitive rate for hot water tank and ended up buying the tank from them, had them remove the old tank and install the new one. The day of install they were prompt and out in about 2 hours. Professional , courteous really great guys. We took a look at my 30 year old furnace and they were able to offer some suggestions for future there too.

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See What Our Customers Are Saying:

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!

by Anna Chin on Twintech Heating and Cooling

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!

by Connor Agnew on Twintech Heating and Cooling

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.

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