Aircon Not Turning On?

When your aircon refuses to power up — no beep, no display, no fan movement — it’s a sign of a complete power disruption or critical system fault. This isn’t about poor cooling. It’s about total system failure.

What Causes a Totally Unresponsive Aircon?

1. Tripped circuit breaker or blown fuse

Power surges or overloads can trip your MCB (miniature circuit breaker) or blow a fuse, cutting power to the unit entirely.

2. Faulty power socket or isolator switch

If the isolator has burned out — or the socket is loose or damaged — power may never reach the aircon.

3. PCB failure (main control board)

A fried or shorted PCB means the system can’t receive or respond to any commands — no light, no sound, no operation.

4. Capacitor or relay failure

If the capacitor or contactor isn’t delivering startup power, the system may stay completely dead, especially in older units.

5. Wiring or internal burn-out

Rodent damage, corrosion, or loose connections can silently cut power at the board or between indoor and outdoor units.

6. Power surge damage

After lightning strikes or blackouts, it’s common for the board or fuse to burn internally — without triggering visible damage.

What You Can Check First

• Is the circuit breaker on?

• Is the isolator switch lit or warm?

• Any recent power trips, lightning, or renovation nearby?

• Is power reaching other appliances in the same area?

Try another device at the same power point to rule out supply fault.

Why It Matters

A dead unit isn’t resting. It’s failed.

If ignored:

• PCB or fan module may suffer deeper damage

• Unit may restart unpredictably when power returns

• Surge damage may void warranty

• Wiring faults may pose safety risks

A dead system isn’t always dead — but diagnosing it quickly prevents bigger failures.

When to Book a Diagnostic

✅ No response when turning on

✅ No light, no fan, no beep

✅ Circuit is on, but aircon won’t power up

✅ Issue started after storm or trip

We’ll check power flow, PCB function, startup load, and internal wiring — and isolate the exact point.