LS Aircon Servicing Singapore

Reasons Why Your Aircon is Short Cycling

Aircon short cycling is a common problem that homeowners encounter. Aircon is essential for maintaining comfort during hot weather. However, if your aircon (AC) starts short cycling, i.e. turning on and off more frequently than it should, it can lead to higher energy bills, increased wear and tear, and reduced comfort. 

Understanding the causes of short cycling can help you address the issue promptly, ensuring your AC operates efficiently. In this article, we’ll explore seven common reasons why your aircon might be short-cycling and provide simple solutions to help you fix the problem.

Why My Aircon Short Cycling Singapore?

LS Aircon Servicing Singapore offers aircon installation, aircon chemical overhaul, and aircon relocation, highlighting some of the most common reasons for aircon short cycling, including thermostat issues, refrigerant levels, oversizing, etc. 

Thermostat Issues

The Problem

One of the most common causes of aircon short cycling is a malfunctioning thermostat. If the thermostat is incorrectly calibrated or placed in a poor location, it can cause the AC to cycle on and off more frequently.

How to Fix It

First, check the thermostat’s placement. It should be located away from direct sunlight, drafts, and heat-producing appliances to ensure it reads the room temperature accurately. 

If the placement is correct, consider recalibrating the thermostat according to the manufacturer’s instructions. If the problem persists, it might be time to replace the thermostat with a newer model.

Refrigerant Levels

The Problem

The low refrigerant level is one of the primary causes of AC short cycling. Refrigerant is essential for cooling the air, and if there’s a leak or the system isn’t charged properly during installation, the AC can’t function efficiently.

How to Fix It

If you suspect low refrigerant levels, contact a professional HVAC technician. They can check for leaks, repair them if necessary, and recharge the system with the correct amount of refrigerant. Never attempt to handle refrigerant yourself, as it requires specialized knowledge and equipment.

Air Condtioner short cycling

Air Filter Problems

The Problem

A dirty or clogged air filter can restrict airflow, causing the AC to overheat and shut down prematurely. This can lead to short cycling and inefficient cooling.

How to Fix It

Regularly check and replace your air filter. During peak usage periods, it’s advisable to inspect the filter every month. A clean air filter ensures proper airflow, helping your AC run smoothly and efficiently.

Oversized Air Conditioner

The Problem

An air conditioner that’s too large for your home can cool the space too quickly, leading to air conditioner short cycling. While a powerful AC is beneficial, it leads to higher energy costs and increased wear on the system.

How to Fix It

If you suspect your AC is oversized, consult with an HVAC professional. They can perform a load calculation to determine the appropriate size for your home. If the AC is indeed too large, replacing it with a correctly sized unit will solve the short cycling issue and improve overall efficiency.

Electrical Issues

The Problem

Electrical problems, such as faulty wiring or a malfunctioning capacitor, can cause your AC to short cycle. These issues can disrupt the power supply to the unit, making it turn on and off erratically.

How to Fix It

A qualified technician should always handle electrical issues. They can inspect the wiring, connections, and components like capacitors to identify and fix any problems. Regular maintenance can also help prevent these issues from occurring.

AC Short Cycling

Frozen Evaporator Coils

The Problem

Evaporator coils can freeze due to restricted airflow or low refrigerant levels. When the coils are frozen, the AC can’t cool the air properly, leading to short cycling.

How to Fix It

Turn off the AC and let the coils thaw completely. Check the air filter and replace it if necessary. Ensure that all vents are open and not obstructed. If the coils continue to freeze, contact an HVAC professional to inspect the refrigerant levels and the overall system for any underlying issues.

Blocked Condenser Unit

The Problem

The condenser unit, located outside your home, needs to be free of debris and obstructions to function properly. If the unit is blocked by leaves, dirt, or other debris, it can cause the AC to overheat and short cycle.

How to Fix It

Regularly inspect the condenser unit and clear away any debris. Ensure that there is at least two feet of clearance around the unit for proper airflow. Trimming back any overgrown vegetation and cleaning the unit with a garden hose (after turning off the power) can help maintain its efficiency.

Conclusion

Aircon short cycling is a common issue that can affect the performance and efficiency of your air conditioner. By understanding and addressing the common causes, such as thermostat issues, low refrigerant levels, dirty air filters, oversized units, electrical problems, frozen evaporator coils, and blocked condenser units, you can keep your AC running smoothly. 

Regular maintenance and timely professional assistance are key to preventing short cycling and ensuring your air conditioner provides reliable cooling throughout the season. 

Frequently Asked Questions

Since a typical cycle should last between 15 and 20 minutes, a 10-minute cycle is considered unusually short.
AC short cycling can be identified when the air conditioning unit repeatedly turns itself on and off. If you observe this happening, it's crucial to address the issue promptly, as short cycling can eventually lead to complete AC unit failure.
Low refrigerant levels force your air conditioner to work harder to cool your space, which can result in malfunctions and cause the unit to short cycle.