6 most common reasons why the RCD is tripping off

How to Reset your RCD Safety Switch

We fix RCD faults FAST! Call 0404 216 333

How to stop the RCD safety switch tripping off.

For fast friendly service in Perth call 0404 216 333 or email us for a free quote.

An easy to use self help guide to fix your RCD.  All RCD electrical faults can be fixed fast by using our services.

The 6 most common causes that make your RCD trip off is often ingress of water in light fixtures, moisture in power outlets, faulty appliances, a faulty RCD, water in 240 volt electric ignition gas stoves and wires not properly terminated / disconnected.  Some other causes we find are rodents, wet extension leads and DIY. Always use a licensed electrician.


Note:  If the RCD keeps switching off  your power, be aware that before you start, some switchboards have several ‘circuit breakers’ or porcelain fuses protected by only 1 RCD.  If this is the case, switch all these circuit breakers off and try to reset the RCD. Note: some people refer to an RCD as a Clipsal Switch.

If the RCD resets then switch the circuit breakers back on,  one at a time, that way you will discover which of these circuits is causing the RCD to trip. * If your board still has porcelain fuses we recommend you have the switchboard upgraded ASAP. 

Circuits for power are often simply labeled “P” and lighting “L”.  Ignore any  N1, N2, numbers as these are for electricians. You can then follow these simple steps below…

Let’s get started… RCD Help Guide: The 5 steps to fix your RCD.

1. Find out what power outlets / lights are affected. Check the switchboard to ensure that it is actually the RCD that has tripped and not a circuit breaker ~ Refer to the photos at the bottom of the page that explains the difference between an RCD and circuit breaker.

2. UNPLUG ALL affected appliances from socket outlets and if lights are affected by the RCD tripping off, turn off all light switches as well.

Check list: Remember you must “UNPLUG” all appliances like dishwashers, any gas cooktops or hot water units with 240v plug tops for ignition,  outdoor power points etc.

Once that is done,   turn on the RCD by firmly pushing the switch up.  You might have to flick it on, off and on again to reset it properly.  Also check that the test button is not stuck in as it will prevent the RCD from resetting.

4. If power and  lights appear to be on,  go about restoring by ‘plugging in and turning on’ to see if  it there was any particular appliance or light that was tripping your RCD.

5.  If you can not find the problem call the RCD fault specialists on 0404 216 333 (Perth and Fremantle areas)  Also, read the additional information below…

For service call  0404 216 333  or email us

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Additional information: Check your switchboard. The RCD switch should be in the up position. Check to make sure it is in fact an RCD and not just a circuit breaker which simply acts like a fuse.  (Circuit Breakers can look the same but an RCD safety switch will have a test button located on the front usually with a  ‘T’  symbol on it).

If the power is out due to an RCD tripping off  and the RCD won’t reset, it is important to actually remove / unplug all cords  from the affected power points first.  (If lights are also affected make sure to turn off all lights if possible).

Circuit Breaker. (No TEST button) OFF position, (DOWN).

Typical RCD. Blue TEST button at top right. Switch is in ON position, (UP).

Pay attention to the following ~

All outdoor power outlets such as  pool, water features, spa, sprinkler reticulation etc.
All concealed power outlets (dishwasher, gas stove, alarm, fridge etc). 

After all appliances are unplugged, try to reset the RCD by firmly pushing the switch up.  If it resets, great, now just plug your appliances back in and you may find the faulty one causing the trouble as the RCD trips off, for example as soon a kettle is plugged in and switched on.

If all power points are unplugged and the RCD won’t reset you will need to call a licensed electrician.

CircuitBreakerAndSafetySwitchFurther RCD reading: Clients sometimes complain that the RCD safety switch keeps tripping at a certain time of day on a regular basis. This will give a savvy electrician a vital clue as to what may be causing it.

One of the most common causes for frequent and regular RCD tripping is the defrost cycle on a fridge, particularly the old “Beer Fridge”.  Often this second fridge is an old clunker which is left out the back in a shed or under the back patio where it is prone to rusting away. The whole appliance is an electrical hazard and ‘down to earth’. Thankfully you had an RCD fitted and it has detected your faulty fridge, switched the power off and possibly save someone from getting an electric shock.

Electricians installing RCD safety switches walk away from a job well done only to be contacted the next day by irate clients who find all the power has been turned off by the RCD. When the electrician arrives on site the RCD simply resets only to have the same fault occur again the next day. What is happening here is usually a time clock program switching on an appliance which is faulty and causes the RCD to trip.  In a secondary sense, it can also be things such as a reticulation system coming on at a programmed time which sprays water onto electrical accessories which are not adequately protected from water.

But often it is just the electrical defrost elements on the fridge which are built into it. These elements switch on at pre-programmed time set by the manufacturer  and if these electrical elements are ‘down to earth’  it will cause the RCD to trip off.  So the RCD is functioning correctly and telling you to have your fridge serviced. Remember, don’t blame the electrician, the RCD will detect faulty appliances and could save you from electric shock. I’ve installed plenty of RCD switches where clients have gladly had to toss out the old fridge or get it repaired.