Metcal Mx500 II Stations

[tal35]

I got several of these at an auction, same as what I use, I plug my good wand and good tip in, light stays green, but the iron never warms. I have not checked to see if I have a 13Mhz signal or not yet. All8 of them have the same problem, either output , and yes I did check my wand and tip before and after on my MX500 II. Any thoughts?