Forum › Forums › Stairlifts › Stannah 420 limit switches and schemetics This topic has 1 reply, 1 voice, and was last updated 7 years ago by ianb. Tagged: 420, Stannah Stannah 420 limit switches and schemetics savutanoMember December 7, 2017 at 10:05 pm Hello all ,from Great White North. I understand the 3 limit switches at the front, there is also 1 limit switch at the back ,i do not understand its operation, I have no manual, and no schematics, Any help. Tia. regards all ianbParticipant December 8, 2017 at 8:09 pm Front three are top limit bottom limit and the ultimate limit is in the middle. The one at the back is a slowing switch to allow a soft stop Viewing 1 reply thread You must be logged in to reply to this topic.