Hello,
I've had the same problem with a blown GICAR control box. Have you seen the other posts regarding this issue? Here are some that have helped me.
Espressione XP1 Gone Cold.
Gicar controller blown again - wiring help!
Valentina died, needs resusitation-advice!
This link has the cheapest I've seen for a control box :
http://www.espressoparts.com/W26305Should you find a cheaper one, please let me know, I'm still looking for one. I just dont have a couple hundred to drop on it right now. Im in the middle of a restoration which will require some cash.
Ish