Elevator Forum BRAHMAJI @brahmaji Forum Home | Recent Posts Active Member Joined: Jan 1, 2010 Follow Profile Activity Topics: 2 / Replies: 2 AllTopicsReplies Reply Drive is displaying the fault M421. Can you please check and tell me what we have to check? 11 years ago Forum Technical Questions Reply we already called for OTIS service. But they are busy, they want some time..... mean while we are trying with our engineer, normally we are doing elev... 11 years ago Forum Technical Questions Topic OTIS controller MCS321, OVF-30 drive 11 years ago Forum Technical Questions Replies: 6 Views: 14282 Topic OTIS OVF30 Drive for MCS-421 controller 11 years ago Forum Code Questions Replies: 1 Views: 2638
