HVAC repair, installation, supply

10 Common Issues and Solutions in Troubleshooting AC Compressor

troubleshooting ac compressor

Share This Post

Air conditioning is one of the modern luxuries that have become essential in our lives, particularly during the hot summer months. At the heart of any air conditioning unit is the AC compressor. Just like any other machine, it can break down or malfunction. When this happens, troubleshooting AC compressor issues becomes vital. Here are ten common problems you might face, along with potential solutions.

AC Compressor Doesn’t Turn On

The most obvious sign of an AC compressor problem is when it fails to start.

Check if the unit is receiving power. If the circuit breaker has tripped, reset it. If it’s not an electrical issue, the thermostat, capacitor, or the compressor motor might be faulty. You’ll need a professional to determine which component is the problem.

Compressor Makes Strange Noises

Noises like buzzing, rattling, or clanking are signs of compressor issues.

Troubleshooting AC compressor noises can involve checking for loose parts, ensuring the compressor motor is functioning properly, or verifying that internal components aren’t damaged.

Circuit Breaker Keeps Tripping

Your AC runs for a short time and then causes a circuit breaker to trip.

This can be caused by a short inside the unit, a grounded compressor, or a faulty capacitor. It’s important to get an HVAC technician to diagnose the exact cause, as repeatedly tripping the circuit can lead to more damage.

AC not working
AC not working

Compressor Runs But Doesn’t Cool

The compressor is running, but the air coming out isn’t cold.

This could be due to low refrigerant levels. A technician can check for refrigerant leaks and recharge the system. In troubleshooting AC compressor issues like this, it’s also essential to check for dirty coils or a malfunctioning fan.

Compressor Overheats

The compressor is hotter than it should be, leading to an automatic shutdown.

Overheating can result from dirty coils, blocked suction lines, or low refrigerant. Regular maintenance, including cleaning and checking refrigerant levels, can prevent this issue.

Compressor Vibrates Excessively

While some vibration is normal, excessive shaking is not.

In the process of AC compressor vibration issues, you may discover that the motor mounts have worn out. Replacing these can solve the problem.

Troubleshooting AC compressor Leaks Refrigerant

You notice pooling around your AC unit or reduced cooling efficiency.

 Leaks are typically the culprit here. A technician should find the source of the leak, repair it, and recharge your refrigerant to the proper level.

Short Cycling

Your AC compressor turns on and off frequently, without cooling the area effectively.

Short cycling can be due to a dirty air filter, a malfunctioning thermostat, or low refrigerant. Changing the filter or troubleshooting AC compressor components can help pinpoint the cause.

Compressor Won’t Shut Off

Your compressor runs continuously, leading to higher energy bills.

This can result from a faulty thermostat or a malfunctioning relay switch. Ensure your thermostat is set correctly and consider replacing it if it’s old.

Compressor Hard Starts

The compressor struggles to start but eventually does.

Hard starts often indicate capacitor problems. Troubleshooting AC compressor capacitors and replacing them when they’re faulty can often resolve this issue.

When to Consult a Specialist for AC Repair

Even while some AC issues may be resolved with simple troubleshooting, in certain cases it’s preferable to hire a professional for AC repair. It’s recommended to leave electrical component maintenance to the professionals if you’re not at ease handling them. 

Furthermore, it’s critical to consult a professional if you suspect a refrigerant leak because doing so needs specific knowledge and tools. It’s time to bring in a professional to diagnose and fix the AC system if you’ve attempted self-diagnosing the problem and the issue still exists.

Maintenance Checks for Your AC Unit

Implementing a regular preventative maintenance schedule is the best approach to stay ahead of AC issues.  inspecting the ductwork for leaks or blockages, cleaning or changing the air filters every 1-3 months, cleaning the evaporator and condenser coils annually, and arranging expert maintenance at least once a year.

Your AC system will function efficiently all year long if you do preventive maintenance, which may help find and address minor issues before they become more serious ones.


The AC compressor is vital for the overall functioning of the air conditioning unit. Recognizing and troubleshooting AC compressor issues early can save you from more significant, costlier problems down the road.

Regular maintenance and inspections can go a long way in ensuring your compressor runs smoothly. If you’re ever in doubt, it’s always a good idea to seek the expertise of a professional HVAC technician.

To find us on google maps for AC Issues and Solutions

More To Explore


Upgrade Your HVAC: Comfort & Efficiency

You need your HVAC system to be on point for a chill indoor vibe. It’s the MVP in controlling the heating, ventilation, and air conditioning