Carrier 30GN Chiller

[sonmel]

Morning,
I have a Carrier 30GN Chiller. My problem is one of the data controllers is showing 000000 when you use the number pad its fine but as soon as you hit a control key the screen goes blank. The guys that work here have stated they have never seen this cell work. Any ideas on why im losing the screen on control would be appreciated.

[jaimico]

I have the same type of compressors for an ice rink in Mexico. I believe that turn off to everything and to review if there is variation of voltage in the main power or ground variations