Is there any way to test out a central vacuum main unit if I don't have
any hoses or heads. I don't want to pay $300+ for hoses and heads if
it isn't going to work.... It has power... I open up a hose cover and
nothing happens... I figure that it needs a signal of some sort via the
two wire/holes it has to tell the main motor to turn on... or it's just
Does anyone know how to get the motor to turn on without plugging in
Most have a switch on the vacuum can itself for when you use the hose port on the can. That will tell you if the unit runs and creates vacuum. To test to see if the relay works just jump the low voltage switch line at the other outlets. Be sure you don't confuse the 120 volt line with the low voltage line if you have a system that provides 120V for a power head.