How to Troubleshoot an RCD Tripping
Quick Answer
Turn off all MCBs, reset the RCD, then turn MCBs on one by one to find the faulty circuit.
How to troubleshoot an RCD Tripping
An RCD that keeps tripping can be a nuisance. This guide covers diagnosing and fixing the issue.
Step-by-Step Fix
- Turn off all MCBs on the RCD side.
- Reset the RCD - it should stay on.
- Turn on each MCB one at a time.
- If the RCD trips on a specific MCB, that circuit has a fault.
- Check appliances on that circuit.
- Call an electrician if you cannot find the fault.
Common Error Codes
| Code | Meaning | Resolution |
|---|---|---|
| RCD trips instantly | Earth fault | Check for faulty appliances. |
| RCD trips randomly | Intermittent fault | Call an electrician. |
Frequently Asked Questions
Why does my RCD keep tripping?
An earth fault, faulty appliance, or water ingress.
Can I fix an RCD issue myself?
Only simple checks - call an electrician for complex issues.