Press the Test button on your RCD — it should trip immediately. Reset it after. Do this every 6 months to confirm it's working.
🏠Homeowner view
Testing your RCD takes 10 seconds. Find the RCD in your consumer unit (fuse box) — it's the switch with a small button labelled "T" or "Test". Press the button firmly. The switch should trip immediately, cutting power to its circuits. If it does, your RCD is working — press the switch back up to restore power. If nothing happens when you press Test, the RCD may have failed and needs replacing by a qualified electrician. Test every 6 months — write the date on a piece of tape next to it. Important: make sure any sensitive equipment (computers, TVs recording, baby monitors) are switched off before testing, as power will cut briefly.