Aircon Turns On — Then Shuts Off Shortly After?

When an aircon powers on, starts cooling, then shuts off after 30–90 seconds, it’s not cycling. It’s aborting. This usually happens when the system detects abnormal load, gas pressure, or electrical irregularity — and stops to protect itself.

What Causes Early Shutdown After Startup?

1. Low refrigerant or pressure imbalance

If gas levels are too low or uneven, the system can’t maintain pressure. It starts, senses the imbalance, then shuts off to prevent damage.

2. Frozen or partially frozen coil

If the coil starts frozen (from earlier runs), the system may attempt to restart, then stop when airflow is blocked.

3. Compressor overload or startup fault

Inverter compressors may kick in briefly — then overheat or cut out if under stress. Usually silent failure with no error shown.

4. Capacitor or contactor fault

Faulty components may allow partial startup, but fail to sustain the system under full load.

5. Sensor or thermistor misread

If the system falsely detects that target temperature is reached, it may cut off prematurely — especially if sensors are dislodged or faulty.

What You Can Check First

• Is the air cold before it shuts off?

• Does the fan stay running or cut completely?

• Any blinking lights or error codes?

• Happens on all units or just one?

If the system always shuts off at the same time, it's a pattern — not a fluke.

Why It Matters

This is the “last chance” warning before full failure.

If ignored:

• Compressor stress compounds

• Inverter boards may short or degrade

• Cooling becomes unpredictable

• System may stop responding entirely

Early shutdown means it’s trying — and failing — to complete a cycle.

When to Book a Diagnostic

✅ System starts, but stops within 1–2 minutes

✅ No error shown, but cooling aborts repeatedly

✅ Only happens during cooling, not fan mode

✅ Issue happens even after resetting

We’ll test gas balance, startup load, board signals, and cooling cycle logic — and isolate the fault accurately.