I just realized we are all going down the wrong path.
6.9 KW total heater output = 2.3 KW per phase
2.3 KW per phase / 230 V phase to neutral / earth = 10 A
Measured current ~ 10 A.
Element resistance when hot, is around 23 ohms.
Top element is open, middle element is fine, bottom element is either opened or unpowered. Somewhere along the common connections is grounded. Probably at the top heating element, near the common connection point.
this is exactly what I think is happening. I think the top element is shorted to ground, but on the left hand side, but I cant explain why!
either way, its definitely fubar, just need to find somewhere to replace the elements on it
