In the hot and humid climate of Singapore, a malfunctioning air conditioner can be more than just an inconvenience; it can disrupt your daily life and comfort. Marvellous Aircon understands the urgency of addressing air conditioner issues promptly and effectively. This detailed guide will cover common air conditioning problems and their solutions, ensuring you stay cool and comfortable throughout the year. We’ll also introduce you to how Marvellous Aircon can help you navigate these challenges with ease.

Understanding Common Air Conditioner Problems

Air conditioners are complex systems that can encounter various issues, some more common than others. Below, we outline the top 10 AC problems and provide a straightforward troubleshooting guide to help you identify and resolve these issues quickly.

1. Air Conditioner Not Cooling

One of the most frequent complaints is that the air conditioner is running but not cooling the room effectively. This can be due to several factors such as low refrigerant levels, dirty air filters, or issues with the thermostat.

Solution: Check and replace your air filters if they are dirty. If the problem persists, contact Marvellous Aircon to check for refrigerant leaks and ensure your thermostat is functioning correctly.

2. Noisy Air Conditioner

A noisy air conditioner can be indicative of a mechanical problem, such as loose parts, a malfunctioning fan motor, or issues with the compressor.

Solution: Tighten any loose components and inspect the fan motor and compressor for damage. If you’re unsure, Marvellous Aircon technicians can diagnose and repair the issue promptly.

3. AC Unit Leaking Water Inside

Water leaking inside your home from the AC unit typically points to a clogged condensate drain line or issues with the drain pan.

Solution: Clear the condensate line of any blockages and check the drain pan for cracks. Regular maintenance from Marvellous Aircon can prevent these issues from recurring.

4. AC Unit Leaking Refrigerant

Leaking refrigerant not only reduces the efficiency of your air conditioner but can also harm the environment.

Solution: This issue requires professional handling. Marvellous Aircon technicians can seal the leak and recharge the system with the appropriate type and amount of refrigerant.

5. Air Conditioner Frequently Turns On and Off

If your AC unit is short cycling, it might be due to an oversized AC, a malfunctioning thermostat, or a dirty evaporator coil.

Solution: Ensure that your air conditioner size is appropriate for your space. Clean the evaporator coil and check the thermostat for functionality. Marvellous Aircon offers sizing advice and component cleaning services.

6. Frozen Evaporator Coils

Evaporator coils can freeze due to inadequate airflow, low refrigerant levels, or running the air conditioner in too cold weather.

Solution: Check the airflow by inspecting the filters and ductwork. If the problem is due to low refrigerant, professional help from Marvellous Aircon is necessary.

7. AC Smells Bad When Turned On

A musty smell from your AC can indicate mold inside the unit or ductwork, while a burning smell may signal an electrical issue.

Solution: Clean the unit and ductwork to remove any mold buildup. If there’s a burning smell, turn off the unit immediately and consult Marvellous Aircon for a safety inspection.

8. High Humidity Levels Inside Despite AC Running

When your air conditioner doesn’t reduce indoor humidity effectively, it could be due to improper operation or sizing issues.

Solution: Check with Marvellous Aircon to see if your AC unit is correctly sized for your space or needs recalibration for optimal humidity control.

9. Thermostat Problems

A malfunctioning thermostat can lead to issues with the AC’s temperature settings and operation cycles.

Solution: Verify the thermostat settings and replace the batteries if it’s battery-operated. If problems continue, consider upgrading your thermostat with help from Marvellous Aircon.

10. Electrical Issues Causing AC Malfunctions

Electrical issues, such as tripped circuit breakers or burnt capacitors, can prevent your air conditioner from functioning correctly.

Solution: Reset the circuit breaker if it’s tripped. For more complex electrical issues, contact Marvellous Aircon for professional repairs.

Preventive Maintenance: The Best Solution

While troubleshooting can temporarily solve some problems, regular preventive maintenance is key to avoiding most of the common air conditioner issues. Marvellous Aircon offers comprehensive maintenance services that include system checks, cleaning, and necessary adjustments to ensure your air conditioning system remains in peak condition.


Knowing how to address common air conditioner problems can save you time and discomfort, especially during Singapore’s hot months. For reliable, expert service, turn to Marvellous Aircon. Visit our website at to learn more about our services or to schedule a maintenance appointment.

Remember, a well-maintained air conditioner not only provides better cooling but also operates more efficiently, leading to lower energy bills and a longer lifespan for your unit. Trust Marvellous Aircon to keep your air conditioning system running smoothly, ensuring you enjoy a comfortable and cool environment all year round.