There's an RCD installed in the panel, and it keeps tripping - especially when it's raining or in the morning when it's humid. The electrician says I need to replace it with a new one. Is this actually a fault, or could there be other reasons?
An RCD can trip for several reasons, and it's not always a fault with the device itself. If it's tripping specifically in humid conditions, you should pay attention to the insulation of cables and appliances in your home - microcracks in the insulation tend to show up when humidity is high. Also check for leaks in your washing machine, bathroom, or kitchen. Sometimes it's enough to find and eliminate the moisture source, replace a worn-out appliance, or repair a cable.
If no leaks are found, it could be an overloaded circuit - when several powerful appliances are running at the same time. An electrician might suggest splitting the load across multiple RCDs or rewiring. That's cheaper and smarter than replacing the RCD right away.
And only if everything's been checked, no causes found, and the device keeps tripping for no obvious reason - then yes, the RCD could have worn out or lost its calibration, and it really does need replacing. But first it's better to call an electrician for a full diagnostic rather than just take someone's word for it.
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