Aircon Keeps Tripping the Circuit Breaker? Here's Why

Q: Common Causes

1. Dirty condenser coils (outdoor unit) When condenser coils are caked with dirt, the compressor works harder, drawing more current. This is especially common if the outdoor unit hasn't been serviced in over a year. 2. Faulty capacitor The capacitor helps start the compressor motor. A failing capac

Q: What You Can Check

Before calling a technician: 1. Check if other appliances are on the same circuit — try unplugging other devices and running only the aircon 2. Check the air filter — a severely clogged filter makes the system work harder 3. Check the outdoor unit — is it blocked or visibly dirty? 4. Check if it tri

Aircon keeps tripping the breaker or shutting itself off. Don't just keep flipping the switch -- find out why.

Professional service required Difficulty: Hard — Professional required Last updated: March 2026

Aircon Keeps Tripping the Circuit Breaker? Here's Why

What You Can Fix Yourself

What You Can Check

Before calling a technician: 1. **Check if other appliances are on the same circuit** — try unplugging other devices and running only the aircon 2. **Check the air filter** — a severely clogged filter makes the system work harder 3. **Check the outdoor unit** — is it blocked or visibly dirty? 4. **Check if it trips immediately or after running** — trips on startup suggest capacitor/compressor; trips after running suggest overheating Share these observations with your technician — it helps with diagnosis.

When to Call a Professional

Why This Happens

When your aircon trips the circuit breaker, it means the system is drawing more electrical current than the circuit can safely handle. The breaker trips to prevent overheating and potential fire. **Do not repeatedly reset the breaker and try again** — this is a safety mechanism. Identify and fix the cause first.

Common Causes

**1. Dirty condenser coils (outdoor unit)** When condenser coils are caked with dirt, the compressor works harder, drawing more current. This is especially common if the outdoor unit hasn't been serviced in over a year. **2. Faulty capacitor** The capacitor helps start the compressor motor. A failing capacitor causes the motor to draw excessive current. Capacitors degrade faster in Singapore's heat. **3. Short circuit in wiring** Damaged or corroded wiring inside the unit can cause a short circuit. This is dangerous and needs immediate professional repair. **4. Compressor failure** A failing compressor draws excessive current during startup. This is usually the most expensive fix. **5. Overloaded circuit** If other appliances share the same circuit as your aircon, the combined load may exceed the circuit's rating. Aircons in Singapore should ideally be on a dedicated circuit (20A breaker minimum).

When to Call a Pro

Always call a professional for tripping issues. Electrical problems are safety hazards. If you smell burning or see scorch marks near the breaker or aircon, turn off the main power and call a technician immediately.

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Maintenance Tip

When renovating, ensure your aircon has a dedicated electrical circuit. This prevents overloading and is standard practice for new HDB and condo installations in Singapore.