While you wait for answers, we may have found some information which could help you.
Success
Message
Intermittent (twice) Then Complete Loss of Power?
Stannah 400?
Stannah 420 batteries?
Battery charging issue?
How can I fix my Bison 50 stairlift?
How to stop the 'beeping?
How can i mend a Wecolator Chairlift LN-20218-36-33?
Stannah 420. 2008?
Minivator 950, 2007 model?
How can I identify which model I have?
How can I repair my minivator stair lift?
Minivator stair lift?