LS Aircon Servicing Singapore

Aircon Capacitor is Bad

7 Signs Your Aircon Capacitor is Bad: An Ultimate Guide

Your aircon’s capacitor is a critical component that plays a pivotal role in ensuring your cooling system’s efficient and effective operation. When you feel your aircon capacitor is bad, you should think about repairing or replacing it. When this component starts to fail, it can lead to a series of problems that impact the overall performance of your aircon. 

This comprehensive guide will dive deeper into the seven signs that indicate your aircon capacitor might be on the verge of failure. The later sections will help you explore the reasons behind these symptoms and offer detailed steps to address the issue.

Weak or Warm Airflow

The first sign that your air conditioner capacitor is faulty is a noticeable decrease in airflow strength. The capacitor is crucial in powering the blower motor, which circulates cooled air throughout your home. 

The blower motor struggles to operate optimally when the aircon capacitor is blown or faulty. The struggle of the blower motor results in reduced airflow. This diminished airflow often translates into warmer air than usual, indicating an issue with the capacitor.

Frequent Tripping of the Circuit Breaker

A bad aircon capacitor can cause your aircon to draw more electrical current than usual. This increased demand can overload the electrical circuit, leading to the frequent tripping of the circuit breaker. 

The circuit breaker is a safety mechanism to prevent electrical fires and other hazards. If you repeatedly reset the circuit breaker related to your HVAC system, it’s a strong symptom that the aircon capacitor is bad.

Hard Starting or Delayed Start

The capacitor’s role in the aircon system provide the initial surge of electricity needed to start the compressor and the fan motor. When the capacitor is bad, the startup process can be delayed, or you may notice a “hard start” where the system struggles to get going. This delay in starting the system can put additional stress on the compressor, potentially leading to long-term damage if not addressed promptly.

Bad Aircon Capacitor

Unusual Sounds During Operation

A capacitor on the verge of failure can produce strange and unfamiliar noises during the operation of your aircon. These noises can include humming, buzzing, or clicking sounds. 

These auditory cues often indicate that the capacitor struggles to provide the necessary electrical boost. This boost is required to function various motors within the system properly. Ignoring these sounds may further damage the capacitor and other components.

Frequent On-and-Off Cycling

When a capacitor is blown or faulty, it can cause the aircon to cycle on and off more frequently than usual. This frequent cycling, known as short cycling, diminishes your cooling system’s overall efficiency and increases the unit’s wear and tear. 

Short cycling can result in higher energy bills, reduced system lifespan, and compromised comfort in your living space.

Visible Signs of Damage

A visual inspection of the capacitor can reveal important revelations about its condition. Look for any visible signs of damage, such as bulging or leaking. A capacitor that appears swollen or has oily residue is most likely blown. Physical damage often results from overheating, and you need to replace such a capacitor immediately to prevent further issues.

Inconsistent Cooling Performance

If you’ve noticed inconsistent cooling throughout your home, it could indicate a failing capacitor. Inconsistent cooling may result in an uneven temperature distribution or persistent hot spots in different areas of your house. 

The malfunctioning capacitor may not provide the necessary electrical boost to the motors, resulting in a compromised cooling performance.

What to Do If Your Aircon Capacitor is Bad?/Aircon Capacitor is Faulty?

Identifying the signs of a failing capacitor is essential, but knowing what steps to take is equally crucial. If you suspect that your aircon’s capacitor is blown, here’s what you can do:

1. Turn Off the Power

Before attempting any inspection or replacement, turn off the power to your aircon unit at the circuit breaker. This ensures safety during the process.

2. Visual Inspection

Carefully inspect the capacitor for any visible signs of damage, such as bulging, leaking, or discolouration. Notice any physical abnormalities that could indicate a compromised capacitor.

3. Testing with a Multimeter

A multimeter is used to assess the capacitance of the capacitor. This device can measure electrical capacitance and help determine if the capacitor is within the acceptable range. If you’re uncomfortable with this process, seek assistance from a qualified HVAC professional like Aircon Repair Services Singapore.

How to change Bad Aircon Capacitor

4. Replacement

If the capacitor is blown or faulty, it’s best to replace it promptly. Capacitors are relatively inexpensive compared to the potential damage they can cause if left unrepaired. Choose a replacement capacitor with the exact specifications as the original one to ensure compatibility.

5. Professional Assistance

If you’re unsure or uncomfortable with the inspection and replacement process, it’s advisable to consult with a licensed HVAC technician. HVAC professionals like Aircon Repair Services Singapore have the expertise and specialized tools to diagnose capacitor issues accurately and replace them efficiently.

Preventive Measures and Regular Maintenance

To avoid capacitor issues and ensure the longevity of your aircon system, consider implementing the following preventive measures:

  • Regular Maintenance: With a qualified HVAC professional, schedule routine maintenance for your aircon, including capacitor checks.
  • Clean and Inspect: Keep the area around your outdoor condenser unit clean and debris-free. Regularly inspect the capacitor for any signs of damage during routine cleaning.
  • Temperature Control: Use a programmable thermostat to maintain consistent temperatures, preventing unnecessary strain on the system.


If your aircon capacitor is bad, you need to be more vigilant. By staying vigilant for the signs of a failing aircon capacitor and taking proactive measures, you can ensure your HVAC system’s optimal performance and longevity. 

Regular inspections, timely replacements, and professional assistance are crucial to maintaining a well-functioning aircon system. If you observe any signs discussed in this guide, it’s recommended to take prompt action to resolve the issue and prevent further complications.