RCBO Keeps Tripping Test Sequence

Before you touch the board, find out when the RCBO trips. Instant tripping, tripping after a load starts, and tripping only in wet weather all point you in different directions. That first question saves time and stops you chasing the wrong fault.

If the same circuit has been altered before, check what changed. A recent kitchen, bathroom, EV charger, shower, or outdoor circuit often explains why the issue only appears now.

1. Confirm the symptom and note when the RCBO trips.
2. Switch off or disconnect the downstream load so you can test the circuit in a controlled way.
3. Inspect obvious problem points first: outdoor accessories, damaged flexes, heat marks, and anything recently disturbed.
4. Carry out the dead tests that fit the suspected fault before forcing live resets.
5. Reintroduce the load or circuit sections one at a time and watch for the trip to return.
6. Once you have found the fault, repair the circuit, then retest and confirm the result.

If you need a broader fault-finding order, the RCBO keeps tripping guide and RCD keeps tripping guide are the natural companion pages.

If the trip keeps happening on an older installation, it is worth checking the wider condition of the circuit. Some jobs need a proper EICR limitations review before the right repair path is clear.

Once you have fixed the fault, retest the circuit and write down what you found. The customer needs a clear explanation of the cause, the repair, and the result after the repair. That keeps the job defendable and avoids loose notes that do not match the work completed.

If the repair leads to a quote for wider remedials, move straight into the electrical quoting app so the fault, the fix, and the price all stay in one clean workflow.

Sometimes the RCBO is not the real problem. If the installation is crowded, badly separated, or repeatedly altered, the practical fix may be a cleaner board layout or a fuller remedial job rather than another temporary patch.

For those jobs, the consumer unit upgrade guide and consumer unit upgrade cost guide help you turn the fault into a proper quote and a sensible next step.