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#36792 - 02/05/24 05:55 PM Otis 211 MUSS fault  
Joined: Apr 2016
Posts: 21
James Dattilo Offline
Mechanic
James Dattilo  Offline
Mechanic

Joined: Apr 2016
Posts: 21
I have an Otis 211 with a Muss fault. I know there’s a solution for it using a timer but can seem to find the wiring or write up on it anywhere. Any help would be greatly appreciated.

#36795 - 02/06/24 12:52 AM Re: Otis 211 MUSS fault [Re: James Dattilo]  
Joined: Dec 2015
Posts: 1,535
Indirtwetrust Offline
ElevatorPractitioner
Indirtwetrust  Offline
ElevatorPractitioner

Joined: Dec 2015
Posts: 1,535
Local 18
If it’s a Siemens starter just replace the logic board

#36799 - 02/06/24 01:58 AM Re: Otis 211 MUSS fault [Re: James Dattilo]  
Joined: Aug 2017
Posts: 426
EElevator Offline
addict
EElevator  Offline
addict

Joined: Aug 2017
Posts: 426
Yes. There's a triac soldered into the logic board that's toast. Gotta swap it out. Write down your overload amp settings and whatnot to save yourself some time.

#36806 - 02/06/24 10:11 PM Re: Otis 211 MUSS fault [Re: James Dattilo]  
Joined: Apr 2016
Posts: 21
James Dattilo Offline
Mechanic
James Dattilo  Offline
Mechanic

Joined: Apr 2016
Posts: 21
Thank you guys I will try that when I get back to the job

#36809 - 02/07/24 01:22 AM Re: Otis 211 MUSS fault [Re: James Dattilo]  
Joined: Dec 2015
Posts: 1,535
Indirtwetrust Offline
ElevatorPractitioner
Indirtwetrust  Offline
ElevatorPractitioner

Joined: Dec 2015
Posts: 1,535
Local 18
It’s a solid state relay and 9 times out of 10 when it’s a shorted up to speed problem what’s actually failed is the little surface mound protection cap across the contact. Once I noticed that new boards from Siemens were coming out without that cap installed I started just pulling them off instead of replacing the logic board. It's C65 directly under the SSR, usually under a lot of hot glue but if you cut a square around in with a knife and pull it out the cap typically comes with it.

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#36811 - 02/07/24 02:02 AM Re: Otis 211 MUSS fault [Re: Indirtwetrust]  
Joined: Apr 2016
Posts: 21
James Dattilo Offline
Mechanic
James Dattilo  Offline
Mechanic

Joined: Apr 2016
Posts: 21
Greatly appreciated. I’ll be going back to the job in a few days. I’ll
Post an update as soon as I get it running. I’m leaning to a new Siemens soft start they are old I was just trying to get the customer by but it’s time they upgraded it

#36923 - 02/21/24 02:48 PM Re: Otis 211 MUSS fault [Re: James Dattilo]  
Joined: Nov 2020
Posts: 15
Tramguage1 Offline
stranger
Tramguage1  Offline
stranger

Joined: Nov 2020
Posts: 15
The control boards can be repaired by World Electronics. All of our service techs carry one in there trucks. 95% of the time its the control board.


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