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AC Compressor Not Turning On

AC Compressor Not Turning On: Troubleshooting Guide | 8 Steps

Imagine a scorching summer day & you’re eagerly awaiting the incredible relief of your air conditioner. 

To your surprise, you switch it on, but the AC compressor refuses to kick into action. 

Before sweating over a potentially costly repair bill, let’s investigate why your AC compressor is malfunctioning.

AC Compressor Not Turning On: 8 Steps to Troubleshoot Your Unit

1. Thermostat Issues

Thermostats: The Brain of HVAC Systems

The thermostat acts as the control center for your HVAC system, regulating the desired temperature. 

If your AC compressor isn’t turning on, the first place to check is the thermostat. 

Adjust it to the desired temperature and mode (cooling). 

Additionally, check the batteries, as a dead or low battery could disrupt communication between the thermostat and the AC unit.

Not all thermostats require batteries. Some are directly wired into the home’s electrical system.

2. Electrical Problems

Circuit breaker in switch box in house

The heart of your air conditioning system lies in its electrical components. 

A malfunctioning capacitor, faulty wiring, or a tripped circuit breaker could be the culprit. 

Inspect the circuit breaker panel for tripped breakers and reset them if necessary. 

If the issue persists, it’s advisable to consult a qualified technician to check out and repair any electrical issues.

3. Capacitor Troubles

The capacitor is a crucial component for starting the compressor and fan motors.

A defective capacitor can stop the compressor from turning on. Signs of a broken capacitor include leaking or burnt appearance.

If you notice any of these issues, replacing the capacitor may resolve the cooling problem. However, handling capacitors can be dangerous, so it’s better to hire our trained HVAC technicians to fix them.

4. Contactor Malfunction

The contactor supplies power to the compressor and the condenser fan generator.

Over time, contactors can wear out or become pitted, hindering their ability to engage the compressor.

A buzzing sound near the outdoor unit could indicate a faulty contactor. Replacing the contactor might be a relatively simple fix, but turning off the power before attempting any repair is essential.

5. Refrigerant Issues

Refrigerant Issues in Air Conditioning Compressor

Low refrigerant levels can lead to the AC compressor not turning on. 

Refrigerant is crucial for heat exchange in the system, and inadequate levels can cause the pressure sensors to prevent the compressor from starting.

Detecting refrigerant issues requires specialized equipment and expertise, making it a task best for HVAC professionals.

6. Condensate Drain Problems

If the condensate drain is obstructed or blocked, it can trigger a safety mechanism that prevents the AC compressor from starting.

A congested drain line can lead to water backing up into the system, causing damage.

Clearing the condensate drain is a straightforward DIY task involving a mixture of vinegar and water or a wet/dry vacuum.

7. Thermal Overload Protection

Air conditioners have built-in thermal overload protection to prevent damage from overheating.

If the system detects excessive heat, it shuts off the compressor. This overburden can be caused by a dirty air filter, insufficient airflow, or a malfunctioning blower motor.

Regularly changing the air filter and ensuring adequate airflow can help prevent this problem.

8. Faulty Compressor

If all else fails, the issue might lie with the compressor. Compressor failure could result from various factors. Including electrical problems, overheating, or normal wear and tear over the years.

Replacing a compressor is a complex and costly task that requires professional expertise.

If that is the case, contact us to book your HVAC service as soon as possible so you can enjoy AC in your house.

Keep Your AC Compressor in Tip-Top Shape for Guaranteed Comfort

Get Our Prompt AC Repair in Plano, TX

Encountering an AC compressor that refuses to turn on can be frustrating.

The good news is that you can fix many issues with our 8-step troubleshooting guide.

Regular maintenance, prompt attention to warning signs, and professional assistance when needed can help keep your air conditioning system running smoothly.

Remember, if the problem persists or you’re uncomfortable performing DIY fixes, you should hire our qualified HVAC technicians to ensure your comfort during hot summer days.

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