How to Fix a Faulty RCD
Quick Answer
Test the RCD with the test button; if it does not trip, replace it immediately.
How to troubleshoot a Faulty RCD
A faulty RCD is a serious safety risk. This guide covers diagnosing and replacing a faulty RCD.
Step-by-Step Fix
- Turn off power at the consumer unit and verify dead.
- Test the RCD with the test button.
- If it does not trip, note the RCD rating and type.
- Remove the faulty RCD from the consumer unit.
- Install a new RCD of the same rating and type.
- Restore power and test the new RCD.
Common Error Codes
| Code | Meaning | Resolution |
|---|---|---|
| RCD does not trip | Faulty RCD | Replace the RCD immediately. |
| RCD trips randomly | Intermittent earth fault | Check for appliances causing the fault. |
Frequently Asked Questions
How often should RCDs be replaced?
Every 10 years or when they fail the test.
Can I replace an RCD myself?
Only if you are qualified; otherwise, use a registered electrician.