Residual Current Devices (RCDs) are equipped with a conveniently placed test button. Regular maintenance involves pressing this button every six months to ensure optimal functionality. When the RCD "trips" and can be reset, it confirms proper operation. However, if pressing the test button yields no response or prevents you from resetting it, this indicates a malfunctioning RCD. In such instances, it's important to reach out to a qualified electrician for assistance. Routine checks not only verify their electrical integrity but also prevent potential mechanical issues from arising, ensuring the continued safety and reliability of your electrical systems.