"Ralf R. Radermacher" wrote

There is a wire pieced through the hose leading to the lift. This wire
is used for a resistance measurement in order to determine if liquid is
flowing through the hose.

Bingo -- that is where I would say the problem lies.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
To reply, remove spaces: n o lindan at ix . netcom . com
Fstop timer - http://www.nolindan.com/da/fstop/index.htm