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Air conditioner troubleshooting flow chart

troubleshooting air conditioners and heat pumps

We have an air conditioner troubleshooting flow chart if you would like a step by step approach to air conditioner troubleshooting.  Please click here if you would like to see a PDF Air Conditioner Troubleshooting Flow Chart. We hope this chart will help you quickly troubleshoot and repair your air conditioner or heat pump. If you have any questions please email us or comment below. Our email address is: support@arnoldservice.com We would Love to Help You out and have your business!

 

 

15 thoughts on “Air conditioner troubleshooting flow chart

  1. I have a 1994 Nissan Quest. My ac blows hot air when I turn it on.

    1. We do not normally respond to auto air conditioning problems, but this sounds like your air conditioner could be low on charge or the compressor might not be working because of the low-pressure switch cut-off or other problem. Sorry that I do not know much about automobile air conditioners.

  2. Steve,
    I have a Senville SENA-18HFO. It stopped heating in February. I use it in the basement and looked at it this week. I am a retired HVAC tech and live in Pa.
    I turned it on and went directly from 240 psig to a low vacuum. I removed the charge of 410a and recharged with exact amount 4lbs, 3ozs. I did evacuate system for several hours and held vacuum for another hour. Leak free. (before recharging) System acted the same after, turned back on.
    Than tested reversing valve. Runs on 220 volts. When power applied can hear and feel valve moving.
    Pumped down system into outdoor unit. Disconnected high side line and put 410a into low side gauge port. No restriction found thru indoor unit. Added a service port to high side and disconnected low side line. Put 410a into high side and flowed thru indoor unit, and low side line without restriction.
    Turned the system back on to observe high side reading. To my surprise it goes into a very low vacuum identical to low side. I have contacted Senville, but they have not replied in four days. Thanks in advance.

    1. Hi Stanley! I am sorry, I have no idea what your problem could be, but it sounds like there is a restriction somewhere. You have tested for restrictions and the system does not seem to have any. I have never heard of this. I would suggest that you try to contact Senville again. Sorry that I can not be any help.
      Steve

      1. Steve,
        Yes, when I have a problem I cannot solve, its generally a unusual problem. The unit ran trouble free for five years. These units are difficult to find parts for, and to speak with a tech at the company. Thank you very much, and I enjoy reading, information posted at your site.

        Stanley

  3. i have a Goodman HVAC at a house that we just bought in Florida. Upon starting the AC it ran for about 20 minutes and shut off.
    Than everytime after it ran the first time, everytime it came on the run time was lesser than the time before. after a couple of hours it would run for about 5 minutes than shut off. Now it comes on and shuts right back off for only a couple of seconds and shuts off. After a 5 minute pause it comes bak on for a couple of seconds and shuts off again.
    If you have the part for me to fix this problem, how much will the part cost with the shipping and handling charge?
    Thank you,
    Bettie Korbilka

    1. Hi Bettie! Sorry to hear that you are having trouble with your AC in the hot Florida weather. I really have not idea what the problem could be without being there to test some components. I would suggest that you look and see if the contactor is staying energized with 24 volts on the contactor coil. You will need a volt meter and some knowledge about electricity before troubleshooting. If the contactor is not being energized then you could have a thermostat problem, thermostat wiring problem, low or high pressure safety switch problem or a time delay relay or defrost control board problem. If your thermostat has batteries make sure the batteries are in good shape. We have lots of air conditioning and heat pump troubleshooting questions with answers and Youtube videos on the following page: https://arnoldservice.com/air-conditioning-heat-pump-troubleshooting-questions-answers-index/ We also have an air conditioning and heat pump troubleshooting simplified page that I hope will help you find and fix the problem: https://arnoldservice.com/air-conditioning-heat-pump-troubleshooting-simplified/ We also have lots of troubleshooting advice on the following page: https://arnoldservice.com/troubleshooting/ If you have any specific questions please let me know. I hope you have a great day! Steve

      1. My outside AC unit will not turn on.
        There is no hum, no sound at all.
        It had been working great, then one morning only the furnace was blowing.
        I have checked my breaker twice.
        I have 25 volts from the therm and the contactor energizes.
        I know my way around meters.
        I have 110v everywhere when I go from ground to everywhere, (contactor both L and both T)
        I have 110v at the compressor terminals
        What I don’t have is 220 across both L coming into the contactor.
        Could 1 of the copper fuses in the shutoff box be blown ??
        (I watched your video where you also didn’t have 220 across the L, but you continued to talk about the working contactor, and not how to test the shutoff box for proper current going to the contactor. Please help, there is a dangerous heat wave coming to Chicago and the kids are already complaining.

      2. Hi Jim! Sorry to hear that your AC is out. As you know you should be getting 210 to 245 volts between L1 and L2 from you home’s disconnect box and with the contactor energized with 24 volts going to the contactor coil you should have 210 to 245 volts AC on T1 and T2. Yes, you could have one of the fuses blown. Here are some Youtube videos that I found on how to check various air conditioning unit disconnects: https://www.youtube.com/results?search_query=how+to+check+voltage+on+an+ac+disconnect I hope this helps you find and fix the problem. Steve

  4. Why would my heat pump call for heat even though I have set thermostat to cool? I went outside and unplugged the heater coil to get my a/c to blow cold again but this isn’t a fix. I have a York heat pump, Model B3HP024A06A

    1. Hi Matt! A heat pump could blow heat in the summer when set to cooling if the reversing valve is stuck or has not received 24 volts to the reversing valve solenoid to make the reversing valve shift. Most heat pumps other than Rheem, Ruud run the cooling cycle with the reversing valve solenoid energized with 24 volts. If the solenoid is not receiving 24 volts from the thermostat through the “O” (usually orange wire) or if the solenoid coil is bad then the heat pump will stay in heating mode. A faulty defrost control board can also cause this problem. With the thermostat set to cool, AC ON, I would suggest that you pull the high voltage disconnect so the outdoor unit does not run then check to see if you are getting 24 volts to the reversing valve solenoid coil. If you are not then you will need to find if you have a thermostat problem, loose thermostat wire or a defrost control board problem. I hope you can easily find and fix the problem. Steve

  5. One of the best information sites I’ve been on.

    1. Thanks so much for your kind words! Hope we can help people troubleshoot and fix their HVAC systems. Steve

  6. Wow you’re web is so awesome totally ran me through everything I needed would recommend you guys above all of the other I have seen thank you so much for your help I am going to build an account and order my parts my name is Greg Hundley. THANK YOU

    1. Hi Mr. Hundley!
      Thank you so very much for your kind words and business! I just received your order and we will get it shipped out soon. We really appreciate your business! Hope you have a great day! Steve

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