Why Does Your Aircon Keep Turning Off?

If your aircon turns on, runs for 2 to 5 minutes, and then abruptly shuts down with blinking lights, it is triggering an emergency protection loop.

Air conditioners feature built-in safety cut-offs designed to protect expensive components like compressors and electronic circuit boards from catastrophic failure.

Reasons for Auto-Shutdown

• Overheated Compressor: Outdoor condenser coils choked with thick dirt, preventing heat release and causing thermal overload cut-off.
• Faulty Thermistor / Temperature Sensor: Misreading room or coil temperatures and sending false overheat/freeze signals to the PCB.
• Refrigerant System Over-Pressure: Clogged electronic expansion valves causing pressure spikes.
• Fan Motor Overload: Indoor or outdoor fan motor overheating due to failed bearings or dust lockup.

Repair & Diagnostic Process

1. Thermal Sensor Testing: Testing thermistor resistance levels against factory temperature charts.
2. Outdoor Coil Chemical Jet Wash: Washing dirty outdoor condenser coils to allow heat release.
3. System Pressure Diagnostic: Checking expansion valve operations and refrigerant gas balance.