Every air conditioning unit in Singapore relies on a small but essential component called the aircon capacitor. This cylindrical device determines whether your AC starts smoothly or struggles to function. Understanding how capacitors work helps you identify problems early and avoid costly repairs.
What Is an AC Capacitor and How Does It Work
An AC capacitor stores and releases electrical energy to power your air conditioner’s motors. Think of it as a temporary power bank that delivers quick bursts of electricity when your system needs them most.
The capacitor provides the initial high-voltage jolt needed to kick-start the compressor when you switch on your unit. Once running, it continues supplying steady power to keep motors operating at the correct speed.
Types of Capacitors in Your Air Conditioner
Singapore households typically encounter three types of capacitors in residential AC systems.
Start capacitors provide the powerful initial burst of electricity needed to get motors spinning. These engage briefly during startup and disengage once the motor reaches operating speed.
Run capacitors supply continuous power to keep motors running smoothly throughout the cooling cycle. They remain active whenever your air conditioner operates.
Dual-run capacitors combine both functions into a single unit. Most modern residential systems in HDB flats and condominiums use dual-run capacitors for efficiency.
Warning Signs Your Aircon Capacitor Is Failing
Recognizing early symptoms of capacitor failure can prevent complete system breakdown.
- Your air conditioner makes a humming sound but the fan does not spin. This indicates the motor lacks sufficient power to start rotating.
- The unit blows warm air instead of cooling effectively. A weakened capacitor cannot maintain the energy supply needed for proper compressor operation.
- Your AC takes noticeably longer to start or fails to turn on entirely. Delayed startup signals a capacitor struggling to deliver adequate voltage.
- The system shuts off randomly during operation due to inconsistent power delivery.
- You notice physical damage such as bulging, swelling, or fluid leaking from the capacitor casing. These visible signs confirm the component requires immediate replacement.
- If your aircon displays these symptoms, scheduling professional aircon servicing can diagnose whether the capacitor is responsible.
Why Professional Replacement Is Essential
While capacitor replacement might appear straightforward, it carries serious safety risks. Capacitors retain electrical charge even after you disconnect power to your AC unit. Accidental contact with charged terminals can cause severe electric shock.
Professional technicians have the training and equipment to safely discharge capacitors before handling them. They also ensure replacement parts match your system’s exact specifications.
Learn more about the different types of aircon services available to address your system’s needs. Understanding your aircon parts and their functions makes it easier to communicate with technicians about potential issues.
Replacement Costs in Singapore
Aircon capacitor replacement in Singapore typically costs between $140 and $240, including parts and labour. High-end systems may cost up to $300 depending on brand and service provider.
Frequently Asked Questions
How Long Does an Aircon Capacitor Usually Last
Most aircon capacitors last between 10 and 20 years with proper maintenance. However, frequent power surges and Singapore’s humidity can shorten lifespan requiring earlier replacement.
Can I Run My Aircon With a Bad Capacitor
Running your AC with a faulty capacitor risks damaging the compressor and fan motors permanently. The additional strain causes components to overheat leading to expensive repairs.
What Causes Aircon Capacitors to Fail Prematurely
Common causes include power surges, lightning strikes, excessive heat exposure, and accumulated wear. Poor ventilation around outdoor units also accelerates capacitor degradation in tropical climates.
How Often Should Capacitors Be Inspected
Technicians should check capacitors during routine aircon servicing every three to six months. Regular inspection catches warning signs before complete failure occurs.
Will a New Capacitor Improve My Aircon Performance
Replacing a worn capacitor restores proper voltage delivery to motors, improving cooling efficiency and reducing energy consumption. Your unit starts faster and maintains consistent temperatures.
