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If you don’t have the manual, this is somewhere to start: http://okprops.com/how-to-problem-solve-an-acorn-180-or-bison-80-stairlift/
If you don’t have the manual, this is somewhere to start: http://okprops.com/how-to-problem-solve-an-acorn-180-or-bison-80-stairlift/