How to reset a tripped safety switch and find the faulty appliance
This guide will walk you through the process of safely resetting a tripped safety switch (RCD/RCBO) and systematically identifying the faulty appliance or circuit that caused it to trip. This is a common issue, and understanding these steps can help restore power quickly and safely.
- Skill level
- Beginner
- Time
- 15-60 minutes (depending on fault complexity)
- Trade
- Electrical
- Updated
- 29 October 2026
Tools you will need
- Non
- Multimeter
- Insulated Gloves
⚡ Resetting a Tripped Safety Switch and Finding the Faulty Appliance
What is involved in resetting a tripped safety switch and finding the faulty appliance?
This guide will walk you through the process of safely resetting a tripped safety switch (RCD/RCBO) and systematically identifying the faulty appliance or circuit that caused it to trip. This is a common issue, and understanding these steps can help restore power quickly and safely.
What skill level is required to reset a tripped safety switch?
Beginner — Estimated time: 15-60 minutes (depending on fault complexity)
What tools are required to reset a tripped safety switch and find a fault?
Torch/Flashlight: For visibility in dark areas, especially if the power is out. Non-contact Voltage Tester (NCVT): To confirm circuits are de-energised before touching. Multimeter (optional): For advanced fault finding, checking appliance continuity. Insulated Gloves (optional): For an extra layer of protection, though not a substitute for isolation.What materials are needed for fault finding a tripped safety switch?
None typically required for fault finding, but a new appliance or extension lead may be needed for replacement.What are the key safety requirements when dealing with a tripped safety switch?
⚠️ ALWAYS assume circuits are live until proven otherwise. ⚠️ NEVER touch exposed wiring or internal components of appliances. ⚠️ Do not attempt to bypass or hold a safety switch in the 'ON' position. ⚠️ If the safety switch trips immediately after resetting, or if you smell burning, hear buzzing, or see sparks, DO NOT attempt further resets. Call a licensed electrician immediately. ⚠️ Ensure your hands are dry and you are standing on a dry surface. ⚠️ Electrical work in Australia must be performed by a licensed electrician. This guide is for understanding the process and selecting the right tools and materials.Step-by-Step Guide
How do you identify a tripped safety switch in an Australian switchboard?
1️⃣ Locate your switchboard: This is usually found on an external wall, in a garage, or a laundry.
2️⃣ Identify the tripped breaker: Look for a switch that is in the 'OFF' position, or sometimes halfway between 'ON' and 'OFF'. Safety switches (RCDs or RCBOs) often have a 'TEST' button on them. Note which circuit it controls (e.g., "Power Points," "Lights," "Kitchen").
Step 2: 🔌 Isolate All Appliances on the Affected Circuit
1️⃣ Turn off and unplug: For the circuit identified in Step 1, go to every power point and turn off and unplug
all appliances connected to it. This includes fridges, freezers, washing machines, toasters, kettles, phone chargers, TVs, computers, and anything else plugged into an outlet.2️⃣ Turn off light switches: Ensure all light switches on that circuit are in the 'OFF' position.
Step 3: 🔄 Attempt to Reset the Safety Switch
1️⃣ Push firmly to 'ON': Go back to the switchboard and firmly push the tripped safety switch all the way to the 'ON' position. It should click and stay there.
2️⃣ Observe: If the safety switch holds, the fault is likely with an appliance or an extension lead. If it trips immediately, the fault is likely within the fixed wiring of the house, and you should call a licensed electrician.
Step 4: 🕵️ Find the Faulty Appliance (If Safety Switch Holds)
1️⃣ Plug in appliances one by one: Starting with the most essential appliances (e.g., fridge), plug them back into their power points one at a time.
2️⃣ Turn on and observe: After plugging in each appliance, turn on its power point switch and then turn on the appliance itself.
3️⃣ Wait for a few seconds: Give the appliance a moment to power up.
4️⃣ Identify the culprit: The moment the safety switch trips again, you have found the faulty appliance. Unplug it immediately.
5️⃣ Repeat for lights: If the fault was on a lighting circuit, turn on light switches one by one until the safety switch trips.
Step 5: ✅ Confirm the Fault and Restore Power
1️⃣ Remove the faulty item: Once the faulty appliance or light fitting is identified, unplug it from the power point or ensure the light switch is off.
2️⃣ Reset the safety switch: Go back to the switchboard and reset the safety switch again. It should now hold in the 'ON' position.
3️⃣ Test the faulty item (optional, with caution): If you suspect an appliance, you can try plugging it into a different power point on a different circuit (if available and safe to do so) to confirm it's the appliance and not the power point. If it trips that circuit too, the appliance is definitely faulty.
4️⃣ Call for repair or replace: The faulty appliance should be repaired by a qualified technician or replaced. Do not use it until it's fixed.
Common Mistakes to Avoid
Pro Tips
💡 Label your circuits: Clearly label your switchboard circuits (e.g., "Kitchen Power," "Bedroom Lights") to make fault finding much faster. 💡 Check outdoor power points: Don't forget outdoor power points, especially if it has been raining, as water ingress can cause trips. 💡 Consider the last thing you did: Often, the fault occurs shortly after a new appliance was plugged in, an old one was moved, or after heavy rain. 💡 Test the 'TEST' button: If your RCD has a 'TEST' button, press it. The RCD should trip. If it doesn't, it's faulty and needs replacement by a licensed electrician. This is a critical safety check. 💡 Look for visible damage: Before plugging in an appliance, quickly inspect its cord and plug for any visible damage, cuts, or burn marks.Recommended Tools
Fluke 1AC-II VoltAlert Non-Contact Voltage Tester: Reliable and easy to use for quick voltage checks. LED Lenser P7 Handheld Torch: Bright and durable for illuminating dark switchboards or rooms.Frequently asked questions
- What is involved in reset a tripped safety switch and find the faulty appliance?
- This guide will walk you through the process of safely resetting a tripped safety switch (RCD/RCBO) and systematically identifying the faulty appliance or circuit that caused it to trip. This is a common issue, and understanding these steps can help restore power quickly and safely.
- What skill level do I need for reset a tripped safety switch and find the faulty appliance?
- Beginner — Estimated time: 15-60 minutes (depending on fault complexity)
- What are common mistakes when reset a tripped safety switch and find the faulty appliance?
- 1. Ignoring the 'TEST' button: Not testing your RCDs regularly (every 3-6 months) can lead to them failing to trip when needed. 2. Holding the switch 'ON': Forcing a safety switch to stay on can cause damage to wiring, appliances, and create fire hazards. 3. Plugging everything back in at once: This defeats the purpose of systematic fault finding and makes it impossible to identify
- What tools do I need for reset a tripped safety switch and find the faulty appliance?
- This guide includes a comprehensive tools list. Key electrical tools are detailed in the Tools Required section.
- What is the Australian standard for electrical installations?
- The Australian standard for electrical installations is AS/NZS 3000:2018, commonly known as the 'Wiring Rules'. This standard outlines the minimum requirements for safe electrical installations, including the mandatory use of Residual Current Devices (RCDs) for all final sub-circuits in new domestic installations since 1991.
- How often should RCDs be tested in Australia?
- According to AS/NZS 3760:2022, RCDs in workplaces should be tested at intervals ranging from monthly to annually, depending on the environment. For domestic settings, it is recommended to press the 'TEST' button every 3-6 months to ensure they are functioning correctly and will trip when required.
- What is the difference between an RCD and an RCBO?
- An RCD (Residual Current Device) protects against electric shock by detecting current leakage to earth. An RCBO (Residual Current Breaker with Overcurrent) combines the protection of an RCD with the overcurrent protection of a circuit breaker, safeguarding against both earth leakage and short circuits/overloads. RCBOs are increasingly common in modern Australian switchboards.
- Can I perform electrical work myself in Australia?
- No, in Australia, all electrical work must be performed by a licensed electrician. This is mandated by state and territory electrical safety regulations, such as the Electricity (Licensing) Regulations 1991 in Western Australia. Attempting DIY electrical work is illegal and extremely dangerous, potentially leading to serious injury, fire, or electrocution.
Written by Sparky, the Electrical specialist at QLD.Tools.