Andy,
Probably not much help but my book says:
Cause: No "machine ready signal" or "hydraulic on" signal.
Action: Check breaker QFB2, QFB3 and thermal relay QFB6.
Check the "machine ready signal" and connections.
Check the magnetic contact and thermal relay of hydraulic pump motor.
Afraid that is about all the help I can offer. If you have found a solution, please post for the rest of us.
Ken