When either hose is hooked up it sounds like they are clogged, but checked, they aren't. Take off motor runs fine.

SOURCE: not enough suction for Panasonic MC-V5716 upright

Probably not the motor protector, its function is shut off the motor if it overheats. Most likely you have a clog or partial clog in the inlet down by the brush roll, or it is in the hose. But if the motor is running, and suction is low, with no clogs, then maybe the motor is running at a slower speed and will have to be replaced.

SOURCE: Dyson DC07 works and cleans fine, but motor makes loud screaching sound.

If the screeching noise is happening at all times, it is most likely a motor failure; which unfortunately can only be resolved by complete replacement of the motor.
If it's a loud ratchety-screeching type sound, and is only occurring when the brush is set to carpet, it is most likely due to an obstruction of the brushroll or a problem with the clutch. Ensure that the brushroll can spin free, look for anything physically blocking it. Check the bearing ends on the brushroll, they can melt and cause the brushroll to not spin effectively. If neither of those two things resolves the problem, the clutch most likely needs replacement.

-R

SOURCE: Motor runs fine and hose not clogged will not pickup dirt

This may sound silly, but have you checked the belt? A lot of Eureka vacuums use the vac motor to run the brush, and if the brush is not running the vacuum won't pick up. Another thing to check is the condition of the fan blades.. if they get worn they will push air out of the exhaust ports, but not push enough air to pull the dirt into the vacuum bag. Another thing to check is the length of the bristles on the brush... you can change a lot of the bristle strips and save the cost of a whole brush roll.. All of these fixes are under $10.00 (Belt: $1-2, Brush Strip $3-6, Fan $5-10) at most places.

SOURCE: No suction on my Electrolux central vacuum in all outlets even though motor is running and there is no clog in the hose.

go to the main unit,you have a blockage where the suction originates.can you disconnect the main suction line to the unit?do that and turn it on.if you have suction then then the main suction tube is blocked.a towel or rag of some sort got sucted in and got caught before it made it to the dirt tank please leave feedback

SOURCE: Performance light is on / no suction

did you check the unit fror clogs. unclog as needed.