My rig is 20 years old. The house vacuum suction pretty much stopped. I've run a snake through the tube and don't feel any blockages. it smells hot even when I disconnect the hose from the box in the ...
I agree pull the hose at the motor and see if you have suction there. if not it's internal to the "Box" (inlet screen) And the comment about the bag... Now I do not think central vacs in RV's have those (I think they just blow it to the ground) but.... THINK means it's possible I'm mistaken.
At 20 years might be a toasted motor too.
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