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error 99 stands for communication fault between timer board and the sr drive.there are 5 things that can cause this error.1.rs-485 cable disconnected or malfunction 2.1 con monitordisconnected or malfunction. 3.run/stop wiring disconnected or malfunction. 4.timer board malfunction. 5.sr drive malfunction. hope this helps, dont forget to vote, thanks, monomoy