hi can anyone help please been out to a york chiller it has 4 scroll comps working as 2 circuits 1and 2 useing common discharge and suction on each circuit, the prob is the unit is only useing a max of 2 comps at any time even if its not acheived temp the control display does not even show any run hours for comps 2 and 3 but in the service mode the system shows the all comps with 0 run time on 2 comps the unit has its eprom changed but no change would be gratefull of any input cheers guys