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Aircon Clicking Noise

A single click at startup is usually a relay switching — completely normal. Repeated clicking during a run cycle, especially with unstable cooling, points to a mechanical or electrical fault that needs tracing.

SAFETY WARNING

Stop using the unit and contact a technician if you notice burning smell or electrical smell, breaker trips or power cut, clicking with sparking, crackling, or or heavy buzzing.

Normal Click During Operation Change

LOW RISK

Some clicks happen when relays switch or airflow parts move during startup, stop, or mode change. The pattern is brief and repeatable without worsening signs.

  • Click is brief and not constant during the run.
  • Cooling behavior remains normal.
  • No strong vibration, smell, or error pattern appears with the click.

WHAT WE CHECK

We confirm the sound timing against normal relay and flap switching behavior before treating it as a fault. A normal click can lead to unnecessary repairs when the sound is judged without the full pattern.

Mechanical Movement Click From Flap or Fan Area

BOOK A CHECK

Repeated clicking can come from moving parts that are blocked, misaligned, or struggling to complete motion.

  • Clicking repeats at the same point in a movement cycle.
  • Flap or airflow direction behavior also looks odd.
  • The click often starts when a movement command is triggered.

WHAT WE CHECK

We inspect the louvre linkage, swing motor, and fan barrel for obstructions or wear before naming a part fault. This can be misread as an electrical relay fault when the issue is mechanical movement.

Electrical or Control Clicking With Unstable Operation

MESSAGE NOW

Repeated switching clicks together with unstable cooling or restart behavior can point to a control or electrical fault path.

  • Clicking repeats during unstable on off behavior.
  • Cooling drops or operation becomes erratic at the same time.
  • Buzzing, breaker issues, or other fault signs appear with the click pattern.

WHAT WE CHECK

Stop repeated testing. We check relay chatter, contactor condition, and board output to isolate the switching fault. Running the unit while it clicks repeatedly can make the fault path worse and harder to isolate.

Other Possible Causes

A brief click during startup or mode change can be a normal switching sound. The concern begins when the click repeats, grows, or links to poor cooling behavior.

How to Tell

  • The click is brief and tied to the same normal operation moment.
  • Cooling and airflow remain stable.
  • No other noise or fault signs appear with the click.

If the clicking repeats during the run or comes with unstable operation, treat it as a diagnosis issue.

Before You Contact Us (Optional)

Observe the sound pattern and operating pattern together:

  • Sound pattern: When the clicking starts in the cooling cycle and whether it repeats / not observed
  • Outdoor unit: Whether the sound seems to come from the flap area / indoor body / outdoor side
  • Airflow strength: Whether cooling / airflow changes when the clicking happens
  • Command trigger: Whether the clicking follows a command such as swing / mode / restart

Common Questions

Same situation with your aircon?

Describe what’s happening. We’ll work out the likely cause and tell you the right next step.

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