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Frequent Air Conditioning Problems and How to Fix Them

The NATE-certified technicians from Deljo Heating, Cooling & Plumbing provide the very best in air conditioner repair in Roscoe Village and surrounding areas, and our services also include AC maintenance, replacement and 24/7 emergency service.

Today’s AC units are ruggedly constructed and will last anywhere from 10 to 15 years or more. Still, problems inevitably develop, and here are some of the more common AC problems you’re like to face.

The unit isn’t running.

The problem could be a breaker or fuse used to prevent the unit’s motor or compressor from overheating. If this occurs, let the unit cool for about five minutes before resetting any breakers.

The unit is running but not releasing cool air.

Both the thermostat and the outdoor unit need to be checked as it’s possible there’s an electrical disconnect between the two.

The AC unit shuts on and off repeatedly.

This problem is called “short-cycling” and usually indicates a problem with the condenser unit or the evaporator.

Refrigerant is low.

Refrigerant is the chemical that cools the air in your system. If the refrigerant level is low that could well indicate a leak, and you need a qualified Deljo technician to find and fix the problem.

Compressor isn’t working.

The compressor applies energy to the refrigerant and propels it though the coils of the unit to carry out heat exchange. If there’s not enough refrigerant, the compressor will run hot and eventually seize up. If there’s too much, the refrigerant will return to the compressor, potentially causing it to fail.

Drainage isn’t working.

Like your filter, the unit’s drain line can become clogged, causing the drain pan to fill and overflow, damaging whatever is around it.

Condenser coils are dirty.

These are located outside with the compressor and can easily become dirty. Washing with a water hose usually suffices, but if they’re too dirty they should be professionally cleaned with a chemical cleaner.

The best way to prevent common AC problems like these is through a preventive maintenance program performed by Deljo’s NATE-certified technicians. We’re here for you, providing maintenance and air conditioner repair in Roscoe Village and surrounding Chicagoland areas since 1922. Give us a call at 773-829-4295, and we’ll have a technician there in no time at all to fix your problem and keep your home cool and comfortable all summer long.

Recent Jobs and Reviews in Roscoe Village, IL

Client Testimonials

Read the opinions of our satisfied customers.

5 stars

This was my first time as a Deljo customer, and I was very pleased. My technician, Giovanni, was very thorough and diligent. He serviced my furnace and identified a faulty sensor that was causing the unit to shut itself down. Deljo ordered the part, and Giovanni replaced it a few days later. Overall, the team at Deljo was great. The dispatcher kept me informed about Giovanni’s arrival time, and the supervisor assisted Giovanni when he was diagnosing the problem with the furnace. I highly recommend Deljo.

Paul D. 10/15/2026

5 stars

I’ve used Deljo for over 10 years now and they always do a good job. Izzy was the technician for this visit and he did an excellent job with my winter maintenance on my multiple units in the household. He also addressed an issue while cleaning the furnace blower wheel. His communication was clear and concise with what he planned to do to address the issue quickly. He was confident and I had 0 concerns or questions. Great job Izzy!

Jeff S. 10/14/2026

5 stars

Paul was great! Arrived on time and completed maintenance on my humidifier, tankless water heater, and two furnaces. All work was performed under my Gold Star maintenance program, so all maintenance charges were covered. Paul did provide a few proposals for additional services on furnace & tankless water heater, but those were emailed to me for further consideration. Paul was friendly, knowledgeable, and answered all my questions.

Jack N. 10/12/2026

5 stars

Gabe did an excellent job with our annual service visit. He arrived in the early part of our service window, was friendly and knowledgeable, and got the work done in a very reasonable amount of time. I have great confidence in Deljo, and am a long-time customer.

Ruth C. 10/9/2026

5 stars

I’ve been using Deljo for 20 years for HVAC but now venture into enlisting their plumbing services. Bashar was very courteous, efficient & informative, and I’d definitely request him again for the next plumbing job. Great experience!

Christopher R. 10/2/2026

5 stars

Working with Deljo is always a good experience, and today’s appointment with Izzy was no different. He was able to come early which actually worked better with our schedules, but called me ahead of time to make sure that was okay. He was friendly and knowledgeable when he explained the work he had done during his visit and our options for fixes. He was also able to schedule a quote appointment for us while he was still here. We would highly recommend working with Izzy and the Deljo team!

Lauren H.  9/25/2026

5 stars

Drew performed the seasonal maintenance on my AC. It needed some repairs and updates and he was able to fix everything at the same appointment. He also noticed issues with the hot water heater and we were able to get ahead of that, as well.

Emily W. 9/11/2026

5 stars

I would leave six out of five stars if I could! My technician Jorge went above and beyond on his service. There was buildup in the rental property’s toilet from the previous tenant. One maintenance person did a surface level job of cleaning but did not fully remove the obstruction. Jorge went above and beyond and came to a solution and even explained the perpetual problems older toilet models can cause. Moving forward with this insight, I can perform my own upkeep the previous tenant did not. Thank you kindly!

Kayla K.  9/15/2026

5 stars

We just had our new boiler installed by Jonathan and Carlos. First rate work! They arrived on time, removed the old boiler, installed the new unit, and explained the features. Both guys were pleasant. Bring on the cold this winter! We are ready thanks to the team from Deljo.

Edward B.  6/26/2026

5 stars

Deljo’s heating and cooling team was awesome to work with. As a first-time homeowner, I really appreciated how clearly they explained everything and answered all my questions. From the quote to the install and follow-up, the service was top-notch. Highly recommend!

Lindsey A. Chicago, IL

5 stars

Matt did an amazing job. He serviced our home and our rental property. He gave us options to help our systems run more efficiently. He also told us about Deljo’s new plumbing inspection which was very affordable. He is great!

Jordan R. Chicago, IL

5 stars

We had a problem with our Humidifier and called Deljo. Jesus came out to help and was amazing. He was extremely knowledgeable, detail oriented, and super courteous. Amazing customer experience!

Jeff C. Chicago, IL

5 stars

Jordan and Jesus were extremely helpful and knowledgeable! We would 100% work with them and have them back. They were both very professional and efficiently fixed our heating system.

Emily L. Chicago, IL

5 stars

Shout out to Ernesto for coming out and servicing our furnace and air con. Deljo provides a great service and glad to trust them with our HVAC for our small business.

Lauren H. Chicago, IL

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