On Tue, 4 Apr 2017 05:12:49 -0700, Bob F opined:

Try using one of your new vacs to reverse suction the whole house
system. Maybe you can clear the obstruction.

If it has good suction at the motor, the tube is plugged.

If suction is low at the motor, there is a leak or the motor is bad.

That's a GREAT idea!

I had asked two years ago how to debug the whole house system:
How do you debu low suction in a central vacuum system?
https://groups.google.com/d/msg/alt....w/C-a-6iiVHrMJ

I eventually gave up because I think the problem may be inside the walls.

I didn't have the additional vacuum cleaners at that time, but now that I
do, I can take the most powerful one and see if it can suction the wall.

I thought of snaking the wall outlets but I don't know what the material is
made up of so I didn't want to risk puncturing the tubes inside the wall
with my 75-foot snake.
https://c4.staticflickr.com/8/7573/1...fb4ff8bd_c.jpg