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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
I know what these codes are: code 19 is that phase c is over current fault and code 23 is a motor stall fault.I would start by making sure you 3 phase wiring going into the mixer is there.I service these mixers as im a service tech for hobart.these units are very detailed and i can walk you thru some things to check but if you have an electrical problem you most likley will have to call a hobart service tech because we have special equipment to diagnose the fault.let me know it may be something simple as these mixers are usally maintenance free.