The exact steps to fix an electric shower that won't turn on depends on the cause, but common solutions involve checking the power supply, solenoid valve, and for limescale buildup. Here's a breakdown:
1. Check the Power Supply:
- Consumer Unit/Fuse Box: The most basic step is to check your home's consumer unit (fuse box). Look for a tripped circuit breaker or a blown fuse associated with the electric shower circuit. Reset the breaker or replace the fuse. If it trips again immediately, there's a larger electrical problem that needs professional attention. Caution: Always turn off the main power switch before working on the consumer unit.
- Isolator Switch: Ensure the shower's isolator switch (usually a pull cord or wall switch) is in the "on" position. Sometimes these can be accidentally switched off.
2. Inspect the Solenoid Valve:
- What it is: The solenoid valve controls the water flow into the shower. If it's faulty, the shower won't turn on, even if power is reaching it.
- The Coil: The most common issue is with the solenoid coil. This coil creates a magnetic field to open the valve. If the coil fails, the valve stays closed.
- Testing: Testing the coil requires a multimeter. You should see a resistance reading (typically between 3 and 6 kOhms, but this can vary). A reading of zero or infinity suggests a faulty coil.
- Replacement: Replacing the coil is generally straightforward (after isolating the power and water). You can often find replacement coils online specific to your shower model.
3. Address Limescale Buildup:
- Why it's a problem: Limescale can clog the showerhead, internal components, and even the solenoid valve, preventing the shower from working correctly.
- Cleaning:
- Showerhead: Soak the showerhead in a descaling solution (vinegar and water works well) to dissolve limescale.
- Internal Components: Descaling internal components is more complex and might require disassembling the shower unit. Caution: Only attempt this if you are comfortable working with plumbing and electrical systems.
Troubleshooting Flowchart:
| Step | Action | Possible Result | Next Step |
|---|---|---|---|
| 1. Check Power | Inspect Consumer Unit/Isolator Switch | Power restored, shower works | Problem solved |
| Power still off, breaker trips again | Call a qualified electrician | ||
| 2. Inspect Solenoid Valve | Test solenoid coil with a multimeter | Coil resistance within normal range | Proceed to check for limescale buildup. |
| Coil resistance zero or infinity | Replace the solenoid coil. | ||
| 3. Remove Limescale | Clean showerhead and internal components with descaling solution | Shower now works | Problem solved. |
| Shower still doesn't work | There may be a more complex problem requiring a professional plumber or electrician. |
Important Safety Considerations:
- Electrical Safety: Electric showers use high voltage. Always disconnect the power supply at the consumer unit before working on any electrical components. If you are not comfortable working with electricity, hire a qualified electrician.
- Water Safety: Turn off the water supply to the shower before disassembling any plumbing.
- Professional Help: If you are unsure about any of these steps, it's always best to call a qualified plumber or electrician.
