The electrical voltage I'm using is 240v similar to Britain's kind and the electric switch connected to it has been broken before probably a year ago. Previously, the light indicator(switch) was a half dimmer than usual and the heater wouldn't work until i smack on the switch a couple of time then the light brightens up before i could use. I changed the whole switch and it worked until recently, same thing happened to the light indicator of the switch dims again and no matter how i smack it, turn on and off, it wouldn't work.
I'm wondering if there's something wrong with the whole system inclusive of the water heater itself or could it be the electric wires behind the socket etc? Should I just get another switch and try again and what if it doesn't work?
Additionally, I wish to know if I could use a test pen on certain parts to test if electric is passing through? I worry I might get electrocuted.
Thanks in advance!