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Problem: AC Unit Not Turning On-How to Fix it.

troubleshooting air conditioners and heat pumps

Problem: My air conditioner will not turn on. What could be the problem with my AC not turning on?

Answer: I found this excellent YouTube video from Word of Advice TV that explains many problems that can cause your Air Conditioner to not work or come on. This is one of the best videos I have ever seen on troubleshooting an air conditioner. I hope this helps you find and fix your air conditioner or heat pump system. If you have any questions please respond in the comments below or email me Steve Arnold at: Thanks so much for giving us the opportunity to serve you! Hope you have a blessed day! Steve

6 thoughts on “Problem: AC Unit Not Turning On-How to Fix it.

  1. I’ve got the light flashing 7 time on the fan control board.

    1. Hi Ed! I would like to suggest that you try to find out what the flash code means by looking at your unit’s blower door or control panel. Different brand furnaces and air conditioners have different flash codes. Sorry that I can not give you any advice. We have lots of air conditioning and heat pump troubleshooting questions with answers and Youtube videos on the following page: We also have an air conditioning and heat pump troubleshooting simplified page that I hope will help you find and fix the problem: We also have lots of troubleshooting advice on the following page: If you have any specific questions please let me know. I hope you have a great day! Steve

  2. Hey all,
    I have had a history of problems with my AC and the electrical side. The breaker blew last summer and I ended up updating my electrical box. I am not sure the electrician set things up correctly. My fan works but the AC doesn’t. When it is set to off, I have 1.1 volts going to it while when cool is turned on I show zero. I can’t figure out why. Thoughts before I call the electrician (it’s only been about 5-6 months so he may not charge me if I’m lucky)

    1. Hi Josh! Sorry to hear that you are having problems with your AC not working! I would suggest that you go to your Air Conditioner’s breaker and turn it all the way off and back on again. If this does not fix the problem then I would suggest that you call the electrician or HVAC company back to see where the problem is located. Sorry that I can not give you much advice. I hope you get it fixed soon! Steve

  3. New furnace installed yesterday. Installer swapped intake and vent lines. inducer intake comes from roof now and exhaust is horizontal through the side of ny house. Called him to let him know and was told this is not an issue.
    There is 27 years of exhaust grime inside the vent pvc, do I really want that on the “fresh” intake?

    1. Hi Tim! Most high-efficiency furnaces that are vented with PVC pipe produce water and pretty much clean the plastic vent pipes. The only reason for the PVC pipe to get dirty would be if the old furnace had a crack in the heat exchanger, or a poor burn and allowed suit and black dirt to build up inside the vent pipe. It really should not matter if the vent and intake are switched unless you see that the pipe is really dirty, but like I say on most high-efficiency furnaces the vents are pretty much self-cleaning. I hope you have a great day! Steve

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