🔌 Why Does My Aircon Keep Switching Off?

If your aircon keeps turning off on its own, even when the room isn’t cold yet, something inside the system is causing it to stop cooling prematurely. This can be due to safety protection triggers, electrical issues, or airflow problems.

Here are the most common reasons behind this frustrating issue.

1. Faulty Thermostat or Temperature Sensor

Your thermostat or sensor detects the room's temperature and tells the aircon when to cool. If it is faulty or misreading the temperature, the unit may shut off even though the room is still warm.

Signs:

• Aircon turns off too quickly

• Room temperature doesn’t match remote setting

• Cooling is inconsistent

Solution: A technician can calibrate or replace the sensor.

2. Overheating Compressor

If the outdoor unit overheats, the system will shut off automatically to prevent damage.

Common causes:

• Dirty condenser coil

• Blocked ventilation

• Weak fan motor

• Compressor wear and tear

Solution: Clean the outdoor unit, improve airflow, and inspect the compressor.

3. Restricted Airflow (Dirty Filters or Coils)

Blocked airflow prevents the coil from cooling properly. When this happens, the system may shut down to protect itself.

Causes:

• Dusty filters

• Dirty evaporator coil

• Mould inside the blower fan

Solution: Clean filters and schedule regular servicing.

4. Frozen Evaporator Coil

When the coil freezes, the aircon may switch off after a few minutes of operation. Once the ice melts, it may restart, then freeze again.

This cycle repeats until the issue is fixed.

Common causes:

• Low gas

• Very low temperature settings

• Blocked airflow

Solution: Defrost the unit and get a proper inspection.

5. Electrical or Capacitor Issues

A weak capacitor or damaged electrical board can make the aircon power on and off randomly.

Signs:

• Clicking noises

• Unit shuts off suddenly

• Aircon restarts inconsistently

Solution: A technician can test and replace the faulty component.

6. Timer or Sleep Mode Is Accidentally Set

Sometimes the simplest cause is overlooked.If the timer or sleep mode is activated, your aircon may turn off automatically.

Solution: Check the remote settings for:

• Timer On/Off

• Sleep Mode

• Weekly schedule (for smart systems)

How Sky Blue Aircon Can Fix This Issue

At Sky Blue Aircon Engineering Pte Ltd, we diagnose shutdown issues quickly and safely.

Our services include:

• Sensor and thermostat testing

• Compressor and capacitor inspection

• Coil and blower cleaning

• Frozen coil recovery and gas pressure checks

• Outdoor unit cleaning and airflow improvement

We ensure your system runs smoothly without unexpected shutdowns.

💡 The Bottom Line

An aircon that keeps switching off is more than just an inconvenience, it’s a sign that your system needs attention. Early diagnosis prevents bigger failures and helps your unit cool more efficiently.

📲 Message us on WhatsApp at 9248 7291 or call 6556 4042.

Sky Blue Aircon Engineering Pte Ltd keeping Singapore homes cool, reliable, and stress free.