Home Forums General Discussion Technical Questions Otis Gen2 SHD2700 shutdown code

access has fixed ours and do a great job, however M421 is telling you to check the fault log in the drive for further info. you plug into drive and press M 4 2 1 this will display the fault log. then you can further try and decipher what is going on. you will need to borrow that tool. i would not necessarily say the drive is bad, until you know what the fault code is telling you the !04A is telling you there is a drive fault and need to check the log. if you do indeed take the drive out, as a precaution, it is always a good idea to record every parameter in the drive. sometimes when they get repaired parameters can be wiped out or changed inadvertently. does happen, and then you are in for some real fun. also in the drive menus there is a menu to check the output that turns on LB relay you can then see if the drive is actually trying to turn on the output for LB. what exactly happens? does it pick up the direction relays and fault out immediately? what kind of fault are you getting on the MCSS log? lot of things to check before you drag the drive away.