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Top 10 Air Conditioner Service Call Problems

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Many people have trouble troubleshooting and finding out what is wrong with their air conditioner when it does not work. I found this excellent Youtube video from Word of Advice TV that shows what the top 10 air conditioner service call problems are. I have the video below. I have the problems listed below the video.  You can see that many of these problems can be easily fixed and are easy inexpensive problems.  I counted 17 top problems and 9 honorable mention problems. I hope this helps you find and fix your air conditioner’s problem. We would love to help you out and earn your business. Please email us anytime if you have any questions. We Would Love to try and Help You Out and Earn Your Business!  Steve & Barbara Arnold

  1. Bad Capacitor. Please click here to see the capacitors we sell.
  2. Refrigerant Leaks
  3. Plugged or stopped up condensate drain line. If you have a condensate pump make sure the pump is working and the condensate pump safety switch is not open.
  4. A bad control board on a furnace or heat pump.
  5. Bad condenser fan motor. Please click here to see the condenser fan motors we sell.
  6. The bad blower motor or bad blower motor capacitor. Please click here to see the blower motors we sell.
  7. Compressor shorted to ground. (will need a new compressor).
  8. Dirty furnace filter
  9. Tripped AC Breaker (If your AC is not coming on I would suggest turning the breaker completely off and back on again to make sure the breaker is on. Do not touch anything metal on your circuit breaker box for safety).
  10. AC completely out of refrigerant (Freon).
  11. Dirty Condenser Coil
  12. Bad Contactor. We sell contactors on the following page: Please click here to see the contactors we sell.
  13. Drain pan coil leaking water.
  14. Mouse or insect damage in the control box.
  15. Broken or loose wires.
  16. Locked Rotor on the compressor. Might use an SPP6 to unlock the compressor. Please click here to see the SPP6 compressor hard start booster we sell.
  17. Inefficient Compressor where the valves are blown on the compressor.

Honorable Mention Problems:

    1. The furnace switch turned off on the side of the furnace.
    2. Blown AC disconnect fuses.
    3. Evaporator Coil completely clogged with lint and dirt.
    4. Restricted metering device. Either restrictor pin orifice or TXV stopped up or not working properly.
    5. Cracked condenser fan blade.
    6. Thermostat bad or thermostat batteries bad.
    7. Low voltage transformer bad. Please click here if you are interested in the low voltage transformers we sell.
    8. The door safety switches on the furnace was not pushed all the way in. A furnace blower door is loose.
    9. Vandalism is where someone intentionally did something to cause the AC unit not to work.

You Can Search Our Site for More Troubleshooting Problems with Answers, Heating, Air Conditioning Parts and Supplies in the Google Search Box Below:

6 thoughts on “Top 10 Air Conditioner Service Call Problems

  1. Hi and thanks for your help that you give.
    Question 1 : How should I know that the sytem is low on refrigerant and what are the effect on the system ?

    Question 2 : How should I know that the system have too much refrigerant and what are the effect on the system ?

    Thank for the answer

    1. Hi Michel-Andre! Attaching refrigerant manifold gauges would tell you if the system is low on refrigerant or if there is too much refrigerant in the system. Most of the time if a unit is low on charge the evaporator will freeze up and you will not get cooling. Being low on charge is hard on the compressor because many times the compressor does not get the cool gas back to keep the compressor running cool. Having too much refrigerant in the system will create high pressures in the system and you will not get good cooling. This is very hard on the compressor because the compressor has a hard time running under high pressure. This will usually make the electric bill high because the compressor has to run using high amps and lots of electricity.

  2. Whose responsibility is it to make sure that the wire on a new air conditioning unit is installed with the correct gauge wire size connecting to the electrical panel. Is it the electrician or HVAC? Thank you.

    1. Hi! It should be the HVAC person’s responsibility since they are installing the air conditioning unit and see the specs on the unit’s label.

  3. I have A question, My A/C runs for 10 minutes and turns off with A exhale or pressure release and then comes back on in 10 minutes it does this all day but the house is cool and the thermostat is set at 80 A man came out and replaced the end cap and then came back and replace the fan in the A/C unit and then he replaced the thermostat, what is wrong ?

    1. Hi Mr. Walker! If you are hearing a pressure release then this is a sign that the air conditioner compressor might have weak valves or if you have a heat pump this would be caused by the reversing valve shifting. If you have a heat pump you might have a defective defrost control board that is turning the unit off and on like you described. If you do not have a heat pump then the compressor could be going off on thermal over-load (over-heating). I would suggest that you turn the power off that is going to your unit the next time your unit stops and feel the top of your compressor. If the compressor is real hot then you might be low on charge or have a restriction in the TXV valve or metering device causing the compressor to over-heat. Your service tech should be able to troubleshoot this by attaching gauges to your unit and see what the pressures read. I would also recommend that you test the connections at your control board the next time your unit cuts off on its own prematurely. You should be getting 24 to 28 volts AC between the Y and C (com) terminals on your control board from your thermostat. If you are not getting the 24 volts between Y and C then you have a thermostat problem or a thermostat wiring problem. Please make sure all low voltage connections and all connections are good and tight. I hope you can easily find and fix the problem. If you have any other questions please let me know. Steve

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