RCCB Keeps Tripping: Appliance Fault or Wiring Leakage?

The RCCB protects people by disconnecting the supply when it detects current leaking away from its intended path. In homes, the cause may be a faulty appliance, a wet fixed point or deteriorated wiring. Guesswork is unreliable because several small leakages can combine into one trip.

What you may notice

• The wider home loses power rather than a single point.
• The RCCB trips when a water heater or other high-load point is switched on.
• Trips appear random but become more frequent over time.

Safe checks before calling an electrician

1. 1

   Unplug portable appliances; do not open fixed connections.

2. 2

   Switch off normal wall switches for water heaters, ovens and air-conditioner isolators.

3. 3

   Reset the RCCB once, then restore ordinary appliances one at a time.

4. 4

   Leave the device or circuit that triggers the trip switched off.

What we commonly find on this type of call-out

• Insulation breakdown inside an appliance.
• Moisture leakage at a bathroom, outdoor or service-yard point.
• Ageing cable insulation or cumulative leakage across several circuits.

Symptoms help narrow the search, but they do not prove the cause. Electricians use suitable test instruments and safe-isolation procedures to separate an appliance fault from a fixed-wiring or protection fault.

What the electrician checks and repairs

• Test leakage and insulation resistance by circuit.
• Separate appliance faults from fixed-wiring faults.
• Repair the cause and verify the RCCB trips correctly under test.

Stop troubleshooting and call promptly when

• The RCCB cannot be reset with circuits switched off.
• You feel tingling from a metal appliance or tap.
• The trip involves a bathroom or wet area.
• The fault returns after the suspect appliance is unplugged.

How to reduce the chance of recurrence

• Use the RCCB test button according to the device instructions.
• Do not bypass or hold a safety switch in place.
• Investigate repeated trips instead of treating them as an inconvenience.

What to send us for a faster assessment

Send a clear photo of the DB box with its cover closed, the affected switch or fitting, your postal code and a short description of what happened immediately before the fault. This helps us bring the likely tools and replacement parts.

Editorial note: This field note describes patterns commonly encountered during electrical call-outs. It is general safety information, not a remote diagnosis. Electrical repair and testing should be performed by a suitably qualified person.