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Michael Hannigan
Michael Hannigan, Engineer
Category: Home Improvement
Satisfied Customers: 11831
Experience:  25+ Years Experience in Field. Master Certified Electronics Tech and Technical Consultant
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I have a MT 5011 LiftMaster Commercial operator that is

Customer Question

I have a MT 5011 LiftMaster Commercial operator that is wired B2, yet the wall 3 station button has to be held in, to allow operation. Ice cube relays have been changed over, with no improvement. Also no remote transmitters function. Could it be the R.P.M. sensor?
Submitted: 1 year ago.
Category: Home Improvement
Expert:  Michael Hannigan replied 1 year ago.

Hello. My name is***** can assist you with your question.

The only reason this usually happens is If a monitored safety device is installed with the B2 wiring and the monitored safety device is removed or not working. This will cause the required constant pressure to move the door. You should be able to correct this though by resetting the device, assuming This adjusted configuration is what you want.

See page 18 on the following document: