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Serving Chester County & Surrounding Areas

Serving Chester County & Surrounding Areas


Service In Hours - Not Days!


Signature HVAC Blog

Troubleshooting an AC That Won’t Work


If you have an air conditioning system that won’t cool down your house or won’t turn on at all, it’s important that you leave any repair work to licensed professionals. If you feel tempted to grab some tools and open up either cabinet of the air conditioner, please resist! You’ll likely make the situation worse, and you’ll probably void the warranty. Don’t let any fast-talking amateur who makes big promises for super-cheap prices convince you to let them do the work either. Let our West Chester, PA air conditioning repair experts see that the job gets done right the first time.

But Before You Call for Repairs …

Although we don’t recommend you try to repair your air conditioner yourself, there are basic troubleshooting steps to take before you call us. You may have a simple problem on your hands or something you overlooked. Here are a few steps to take to make sure you have an air conditioner that needs our professional attention:

  • Check the thermostat: Sounds a bit too simple, right? You’d be surprised how often people overlook the settings on their thermostat and assume the AC isn’t working. Someone else in the household may have changed the settings without you knowing it, and kids love to play with the buttons. Make sure you’ve got the thermostat set where you want it.
  • Reset tripped circuit breakers: If the air conditioner won’t come on at all, go to the electrical panel for the house to see if any circuit breaker has tripped. It’s not uncommon for one of the motors in the AC to overload a circuit. Reset tripped breakers, then try the AC again. If the breaker problem persists, then call for repairs—there is probably an electrical issue with the AC.
  • Replace clogged filter: The air filter in the HVAC cabinet needs to be changed regularly during the year (both the AC and furnace use this same filter). If the filter stays in play for more than three months, it will become too clogged to allow air from the return vents to flow into the air conditioner to be cooled down. This will cause a steep drop in airflow and cooling capacity. Change the filter, and stay current through the rest of the summer changing the filter every one to three months.
  • Clear the outside cabinet: Check to see if there are obstructions close to the outdoor condenser cabinet, such as brush, leaves, and branches. These will block the AC from releasing sufficient heat from indoors. Clean off the cabinet if it is extremely dirty. (Don’t blast a high-pressure hose into the cabinet, however, as this may damage the coil.)

Now Call for Our Experts

You’ve exhausted your options below, and now it’s time to call our technicians. There are many different possible reasons for an AC that isn’t cooling down a house, and a big part of the job of a professional is to make an accurate diagnosis. You can trust our team to find out what’s wrong and get it fixed so you can enjoy a cool house once more.

Call on Signature HVAC for service in hours, not days. Signature Service You Can Trust!

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