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"A few things may have happened. You may have a clog in your vacuum tubing in the home or you may have a clog in the vacuum hose. To test the hose, plug it directly into the vacuum inlet either on the front of your central vacuum or beside you vacuum. These inlets are usually the closest ones to the canister and if the hose has lots of suction here, than the problem will be somewhere in the lines in the home. Call us to do a service call to correct the problem. If the hose has little suction then you probably have a clog in the hose. Bring it in to us.  Another area you can check is the vacuum inlets to make sure that a door is not broken or to see if the rubber gasket is still seated inside the flap. If either of these has occurred, you need to replace the inlet valve."
<https://vacconnection.com/products/beam-var-speed-analog-hose30>