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One of the most frustrating situations is when you are experiencing a faulty AC unit during an extreme weather condition. It’s so hot outside that you swear it could boil an egg in five minutes, so you stay at home, turn on the AC, and you hear nothing.

No motor running, no air coming out, not even the click that turns it on. If you’ve experienced this, then you know how important it is to understand how to repair your central air conditioning system. What follows are the most common issues concerning central air conditioning systems.

I Can Do This

Maybe you should just call a licensed technician for central air repair and be done with it. You could, but there are some problems which you can quickly solve; plus it saves you a lot of money:

Issue No. 1: You notice that the air coming out is not consistent. Sometimes it’s cool enough but other times, not so cool. The first thing you should do is to check the thermostat. Make sure it is not set to “Fan” and is either in “Auto,” “Low Cool” or “High Cool.” Otherwise, it’s never going to cool.

Issue No. 2: The air coming out is cool, but you feel it’s not at the right temperature you set the thermostat (i.e., you put the thermostat at 16 Celsius because you like the cold, but it feels around 25). The most probable cause is a dirty air filter.

When dust or any other elements get into the filter, it blocks and decreases the airflow coming into the AC causing it to struggle to get to the level of cold you wish. If you have a permanent filter, simply clean out the filter by rinsing it with plain water. If you have the disposable kind, just replace it.

It’s Too Complicated

Here’s a couple of complicated problems which might fall into the “I need help” category:

Issue No. 3: The AC is running fine, yet it seems it won’t stop even when the desired temperature is reached. This is problematic because this will cause the unit to overwork all the time, maybe create some ice formation, and worst case scenario, damage the compressor.

This might be a defective contactor. The contactor tells the thermostat when to stop giving out cool air because the temperature has been reached. Although the parts are not expensive, you might need a technician to confirm the problem and to replace it.

Issue No. 4: A hissing noise can be heard in the unit. The AC works fine during the night and during cooler days but can’t handle extreme heat. The problem might be a refrigerant leak. The refrigerant intercepts the warmness from the surrounding air so that the cool air can move quicker.

Stop the AC immediately and call a professional before you break something beyond repair.


Well, you’ve done it now. The do-it-yourself (DIY) central air repair failed, and you need a replacement soon because it’s going to get hotter tomorrow. Don’t rush. The best thing to do is to have a licensed technician assess your needs and suggest some central AC specs that would be perfect for your house.

Plus you’re going to need someone to install it anyway, right?

Perform research and pick and choose the right central air conditioner for your home because it’s important to gather as much information as possible to make an excellent decision and hopefully not waste thousands of dollars if you buy the wrong one.

Look for a Specialist

So if you’re wondering what the goal of this article is, it’s only to help you decide if its worth the time and effort for DIY repair for your central AC. Because if you’re off by just small calculations, then you would have wasted hours and lots of money.

So please swallow your pride and look for a specialist to evaluate and correct the problems. Find a company that is an expert in central air repair, and they might even give you tips along the way. It’s a “win-win” situation.

Call us today!

Classic Services AC & Heating

1893 State Highway 46 South, New Braunfels, TX 78130, United States

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Service Areas:
Fair Oaks Ranch
Garden Ridge
La Vernia
San Antonio
San Marcos
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