It is quite worrying and frustrating when your sauna's fuse keeps tripping or the residual current device (RSD) activates. This problem could be due to several causes and it is important to investigate them carefully to minimise the risk of damage or danger.
The most common cause is a component of the sauna heater, namely the heating rod. It can fail or become damaged over time, causing the fuse to blow or the RCD to activate.
Another possible cause of this problem could be faulty wiring. If the wiring of your sauna or the entire electrical circuit has not been properly installed or maintained, this can also cause fuses or RCDs to trip. Make sure that all cables and connections are properly connected, insulated and in good condition. Again, it is advisable to consult a professional to ensure that your sauna's electrical systems are installed and functioning safely and correctly.