Faulty switch or something else??

[littlespark]

Going to look at a faulty grid switch isolator on Monday, hopefully just a faulty switch, but I’m wondering if there could have been a mix up with the original wiring.

Worked in this house before where I found the legs of the upstairs and downstairs rfc’s had been mixed up at the board.... now I’m thinking same could have happened in kitchen ring.

The problem is that the grid switch for the washing machine in the kitchen doesn’t isolate the washing machine. Although the other 3 switches in the grid operate their appliances. (W/m being second from left)

Faulty switch, sticking on was my first thought.... but what if the grid is wired incorrectly? Ie, the spur from the washing machine is actually one leg of the ring?
Turning the switch off is creating 2 radials.

 

[telectrix]

most likely the switch contacts have welded closed.

 

[timhoward]

Think I agree, start simple. A multi-meter across the terminals will quickly prove the point!

(Just about anything is ultimately possible - I found a fused spur mis-wired once so the ring was the 'load', with the 13A fuse completing the ring, the real load was energised all the time...)

 

[littlespark]

As I said, faulty switch was my first thought, and I’ll get one ordered for next week, but after previous mistakes made in this house from new, I wouldn’t be surprised if the wiring all arse for elbow