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Troubleshooting Faulty Microswitches in Electric Showers

Troubleshooting faulty microswitches in electric showers involves a few steps to diagnose and potentially repair the problem. The microswitch in an electric shower is a critical component that controls the heating element, allowing the shower to produce hot water when needed. Here’s a general guide to help you troubleshoot this issue:

Safety First

  • Turn off the electrical supply to the shower unit at the breaker before starting any work. This is crucial to prevent electric shock.
  • If you’re not confident in your ability to safely perform these checks or repairs, consider hiring a qualified electrician or a professional plumber.

Diagnosing the Problem

  1. Identify the Microswitch: Locate the microswitch inside the shower unit. This will usually require removing the cover of the electric shower unit. The microswitch is typically connected to the dial or button that controls the temperature.
  2. Visual Inspection: Check the microswitch for any obvious signs of damage, such as burnt areas, corrosion, or a broken mechanism.
  3. Test the Microswitch:
    • Use a multimeter set to the continuity setting.
    • Place the probes on the microswitch terminals.
    • Activate the switch mechanism manually (you might need a small tool or your finger to do this, depending on the design).
    • A functioning switch should show continuity when activated and no continuity when in its default position. If this isn’t the case, the microswitch may be faulty.

Repair or Replacement

  • If the microswitch is faulty, it will need to be replaced.
  • Make sure to find a replacement that matches the specifications of the original switch, including its size, type, and electrical ratings.
  • Once you have the replacement microswitch, disconnect the old one and connect the new one in the same manner. Pay careful attention to the wiring and ensure a secure connection.

Reassembly and Testing

  • After replacing the microswitch, reassemble the electric shower unit.
  • Turn the power back on at the breaker and test the shower for proper operation. Ensure that the water heats up as expected when the shower is turned on.


  • To prevent future issues, it’s a good idea to regularly clean your shower unit and check for any signs of wear or damage. Also, avoid forcing the controls, as this can lead to premature failure of components like the microswitch.

Keep in mind that working with electrical appliances, especially those involving water, poses risks. If at any point you’re unsure or uncomfortable with the process, it’s best to seek professional help. Electric showers can vary greatly in design, so consult the manufacturer’s manual for specific advice related to your model.

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