Updated
Electric Shower Tripping The Electrics
Your electric shower is tripping the RCD or circuit breaker every time you turn it on.
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What's happening?
Electric showers are high-power appliances supplied by a dedicated circuit. When a shower trips the electrics, there may be an earth fault in the shower unit, wiring, isolator, or connections. The RCD disconnects the supply when it detects an imbalance that may indicate current leaking to earth.
What usually causes it?
- Water ingress into the shower unit or its electrical connections
- Heating element in the shower has failed and is leaking current to earth
- Loose or corroded connections in the shower isolator switch or junction
- Cable to the shower has been damaged (e.g., by a nail or screw through the wall)
- Shower unit is old and insulation has degraded internally
Is it dangerous?
A shower that trips the electrics should not be used until the fault is found and fixed. Water and electricity are a dangerous combination, and the RCD is tripping because it has detected current flowing to earth — potentially through the water or through you. Never bypass the RCD or remove it to keep the shower working. The protection is keeping you safe.
Can I fix it myself?
Do not open a shower unit or attempt to dry out its electrical parts. Turn off the shower isolator and leave it off until a competent electrician has investigated the fault.
When should you call an electrician?
Call an electrician if your shower trips the electrics even once. While a single trip could be a one-off (e.g., water splash during installation), repeated tripping indicates a fault that needs professional diagnosis. Do not keep resetting and trying the shower.
What will the electrician actually do?
- Isolate the shower circuit and test the wiring for insulation resistance
- Inspect the shower unit connections and internal components
- Check the shower isolator switch and cable for damage or water ingress
- Replace the shower unit if the heating element has failed
- Test the circuit after repair to confirm safe operation
- Verify the shower circuit has its own dedicated MCB and RCD protection
Frequently asked questions
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Sources & References
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