TroubleShooting Low or No Suction Issues Q&A

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2 Motor System With Low Suction

I have a Silent Master central vacuum that is a 2004 model. When I take the bag and filter out of the unit there are 2 circles in the bottom that look identical. One is working properly (you can feel proper air flow) and the other isn't (no airflow), resulting in low suction. Is that two motors and one isn't working? Right before this happened I noticed a burning smell. I was vacuuming up lots of baking soda at the time. Do I need to replace one of the motors? I did the troubleshooting chart and ended up at #8. Thanks, Deb Dallas,TX


Based on the information provided, it sounds like you will need to replace your motor. Depending on the model of Silent Master you have, you can find the correct replacement motor by clicking the following link: Silent Master Motor Options We recommend replacing both motors since they have the same amount of work hours on them and the other will likely end soon too.

Astro Vac No Suction All of A Sudden

I have a astro vac sr-50 and all of the sudden in between changing attachments the suction went out the power for the vac attachment still gets power but no suction

  1. Does your central vacuum activate with the manual on/off switch located on the side of the can? If so, please refer to #2 below. If not, the issue may be a result of a faulty circuit board or a faulty motor. Replacement Astro Vac SR50 Motors and Circuit Boards can be found on our website. Please refer to our Troubleshooting Flowchart to determine which item should be replaced.
  2. The switch in your hose handle failed. Please compare our Hose Switch Replacements to the switch inside of your hose handle.

Beam 750 No Suction

I have Beam central vacum system model 750 installed when mu house was built in 2005. It was working well until now when it lost its vacum suddenly. When I checked the outlet at the vacum drum itself it was working fine but all other wall outlet inside the home has no suction power. Thanks, Naveed.

There is a clog/blockage in the piping system. Please refer to Solution #3 on our Troubleshooting Flowchart for tips on clearing the blockage in the pipe system. A local central vacuum service center can also help you determine the location of the clog.

Bucket Not Secure, Low Suction

cleaned the Kenmore central vac can not get the canister to seal tight /hangs slightly loose from the main body,any suggestions might be helpful,thanks.

Please ensure the canister gasket is in place for a secure fit.

Clogged Hose Repair

Glenna Hamiltion Ontario Canada We have a Kenmore Mark 5 Central Vac which has low suction at the end of brush motor runs and has been replaced once I have tried suctioning marbles up they come back when I shake the hose it appears to me something is clogged in the hose unable to unclog this 50- to 100 ft hose would appreciated any suggestions you may have also tried to unclog with a large Shop Vac attached to hose TYVM Glenna

Unscrew a broom stick and feed it in through the wall end of the hose. It should stop at the clog and you can hold the stick and break the clog up. We have replacement hoses, including 50ft hoses.

Cloth Filter Not in Right?

I have a ureka built in vaccum (not sure the model) and my husband accidently took off the cloth filter that hangs down when cleaning the unit but now we don't know how to put it back together and there is no suction (i am assuming because it is not put back together properly) thanks Elya Kelowna, BC

The cloth bag with stiff outer compression rim needs to sit inside the two grooves made for it. If it sits above the groove, it will clog the air intake to the motor. Flex the rim in and let it pop into the groove. The bag hangs down when not in use.

Cycling On and Off

We have an Air Vac 525 installed in 2000. The unit seems to cycle on and off. I have replaced the hose and filter. The screens become clogged and we clean periodically. The filter bag has debris inside the bag. Could the bag be installed incorrectly? or be the wrong size? it seems to fall into the canister.


The cycling on and off is generally caused by a faulty circuit board. Replacement circuit boards can be found on our website. The filter should have a weighted bottom and hang down a few inches. If the bag does not stay in place, please replace it with our center weighted cloth filter.

Dual Motor, No Suction

We have a nutone 11years old model cv-450 no suction from main system. checked all wires /all conected. Reset no response. Have dual motore, both working still no suction. Thanks Craig from WI

To get started, please disconnect the pipe(s) from the intake. Is there good suction from the unit alone? If so, please refer to Solution #3 on our Troubleshooting Flowchart. If not, it could be an issue with the filter or a deteriorated gasket. Verify that the filter is not clogged or that the gasket has not been compromised.

Fasco Dirt Build-up Under Motor, Low Suction

I have a Fasco 851DM, after each vacuuming I have to remove a round dust patty from the screen closest to the motor or the suction will greatly diminish for the next use. There are no obstructions, filter is clean,so is canister. Unit is 10yrs, always worked fine. Why does this dust patty form on that screen now and never before. David, Prattville, Al


The Fasco should have an inverted cloth filter in it. If it is there, it means debris must be getting around it and you will need to replace the filter. Read the information listed below for further information on replacing the inverted cloth filter.

Important Information: Fasco has long been out of the central vacuum market and has no direct cloth bag replacements.

The black rubber gasket type is obsolete. You can either unstitch it and put the new cloth bag in the old rubber or you can buy similar rubber material and create your own. NOTE: There are no more gaskets available, from any vendors, that go on top of the bottom bucket.

Further Testing for Low Suction

I have an Electrolux unit, it came installed in house we just purchased (forclosed home). The unit has very little suction at the power unit (I followed your flowchart). I notice the pressure/volume coming out the exhaust is very good, but on the intake side you can barely feel any suction. What would my next step be? Everything seems sealed up good.


To get started, remove the filter located inside of the canister and test the system. Do you notice increased suction? If so, you will need to replace your filter with one of the Filter Options located on our website.

If you do not notice increased suction after removing the filter, disconnect the pipe that is connected to the intake on your unit and test the system. Hold your hand over the intake. Does the motor rev up? If not, the unit is leaking. Can you feel or hear any leaks around the can?

Access the motors located on the top of the unit. Do you see any excessive blue sparking? If so, your motor is failing and needs to be replaced with one of the Electrolux Motor Replacement Options located on our website.

Galaxie With Poor Suction

Hi I am Ben. My CV (Galaxie unit) is 9y old and used to work fine. Recently I found it has low sucktion. I thought it might need to empty the trash bag, then unplug the power and went head to empty the bottom basket, hooked it back on, plugged the power back. Sadly, it didn't improve the suction at all. Without the hose on, there is no suction on the inlet at all; plug the hose into the inlet, can hear the motor working, but still very low suction. Please help. Thanks!


Most Galaxie central vacuums are two-motor systems. When one fails, you will notice a significant decrease in power. You may view Galaxie Motor Replacement Options on our website.

If your motors are both functioning properly, your pipeline may clogged. Please read through our Troubleshooting Flowchart for tips on locating and removing clogs in your pipeline.

Hayden Suction Cuts Down

I have a Hayden 6000 super vac and initially the suction is great. In about one minute the unit goes to a low suction. It has occurred in all hose inlets. I have emptied the canister and cleaned the circular paper filter. Thank you


This issue is likely due to a faulty relay which can be remedied by replacing the electronics (relay, transformer, mini breaker) with our Generic Single Motor Circuit Board #235S. Please note that the mini-breaker and low voltage connection tower come with nuts that screw down and secure the board to the outside of the vacuum tank. If these two holes do not align with holes on the vacuum tank, a new hole will have to be drilled for proper mounting.

Hose Switch Not Activating The Vacuum Suction

i have a silent master central vac - the floor suction port in the kitchen works fine, but when i plug the hose into any outlet and flip the switch on the hose handle it will not turn on and there is no suction Kevin, PA


The issue could be a result of a faulty switch in the handle or a short in the low voltage wires in the wall. Please follow our Troubleshooting Flowchart to narrow down the problem.

Initial Suction Okay, then Weak

I have a centra-clean CP 5000 unit. When we start the unit, the suction initially is strong, but then stops after one minute. Does this sound like a clog or a weak motor? Given the fact that the suction is initially strong, it doesn't seem like it could be a clog in the system. Thanks for your help


There are many potential causes for this issue: a clog, a faulty motor (if there are two motors), a broken pipe, or clogged filter. Please use this our Troubleshooting Flowchart to help pinpoint the culprit. You may also contact a Local Service Center for further assistance.

Kitchen Baseboard Vent Inlet Leaking?

This concerns a Stealth system. The suction is minimal and I wonder if what appears in the kitchen on the floor (a vent with suction) could actually take away the power of the hose. Liz Bloomfield NY

When the vacuum is in use you should not hear leaking at any other inlet or the floor inlet (VacPan) in the kitchen. Maybe you'll hear a small whistle leak but that is okay. If your system has no major leaks but your suction is weak, use this troubleshooting guide for help.

Lost Suction at Hose

All of a sudden, I do not have suction in the hose from any of the outlets. There is suction at the power unit - just not anywhere else in the house. What could be the problem?


There are precise steps to take to find the issue. To get started, please follow our Troubleshooting Flowchart to help narrow down the cause.

Low Air Flow Overall

We have a Hoover 8100. It has decent suction at the intake on the unit but it appears there is low overall airflow as the exhaust is virtually non-existant (tried it by opening intake and disconnecting the exhaust). Have also run paper towels through the pipes and they came through fine. Any idea what to try next? Really appreciate the information on this site. Thanks. Nav from Calgary, Canada


Thank you for the compliment, let's see if we can help you. To get started, remove the debris intake line, turn on the vacuum manually and test the suction at that intake on the tank. If it is good at the unit, it should be good in the home unless the pipes are clogged. If air is going in well then it has to be exhausting well. Also, try removing the filter to see if suction is better overall in the home.

Low Suction After Cleaning Filter

someone else ws using the vac and said it was making a funny noise so they turned it off and took the filter off and cleaned out the debris and now the vac has barely any sucking power. The motor was replaced last year. It does not smell bad and when I put another vac where the inlet to the motor is and suck through the system that way it appears there is nothing in the pipes. I don't think there is a blockage any where. help


Usually, this indicates the unit was not reassembled correctly and is causing air to leak. It's possible that the filter may be misaligned and is blocking air flow. Another possibility is that if your system has two motors, one of them could have failed.

Low suction at all ports

I have a Fasco mastervacII (Model#852SVDM) installed in the home I purchased about 1994. I have experienced low suction at all ports and discovered only one motor is working. The motor that does not appear to be working constantly trips its' own minibreaker When turning the unit on and there is little or no air coming through the top screen on that side. Does it likely mean I need to replace both motors? The side that will run continues to operate properly, however the suction at all ports is diminished. Please advise.


You are correct, both Fasco motors both need to be replaced. The thermal breaker should be fine. When a motor goes bad it heats up or spikes thus tripping the breaker on the unit. 5% of the time the minibreaker is also damaged but you can't tell without a new motor.

Low Suction at Several Ports

Decreased suction at several ports,what can I do to improve this?. I just changed the bag.


Spray a full paper towel with any cleaner and suck it down the hose, starting at a corner. This will help clear any obstruction in the line. If only a few ports have low suction, then it is a clog in the pipes. You can view additional information on clogs on our Troubleshooting Guide.

Low Suction on Hide-A-Hose

My name is Rachel and we have a new HideAHose CV. From the beginning, I have felt the suction might be low in our main floor. Both the garage and the upstairs hoses clean easily and retract very quickly. On the main floor, I find I can suck up a cheerio, but not a sunflower seed. How much suction should I expect out of a CV? The main floor hose is longer than the other two and retracts slower as well.


There may be an obstruction in the hose and/or pipeline that is reducing airflow, or not enough power at the unit to run the long hose. Contact the installer for an inspection of the system.

Low Suction on Single Motor Central Vacuum

My electrolux with a 1590 motor that was replaced last spring isn't working right-no suction. I know there is no blockage in the pi[pes etc. but you said it may be one of two motors. I don't have 2 motors. What could be some other things I acould check. Thanks, Ginger, Carthage


You need to systematically check the unit using our Troubleshooting Flowchart. It starts with the source and works its way back. Follow each step carefully. If indeed the suction is low directly at your one motor unit, remove the filter, check for leaks at the emptying gasket, and try it again. You will be checking the suction directly at the intake after you remove the pipe from it that leads to the home. The suction should not be low at that point because motors do not slow down after time unless they are given less voltage to run on. Let us know what you find.

Low Suction, Hot Exhaust

AV3500 Three years old. I have ordered a replacement for the cloth filer. The suction is very low and the top of the canister and the exhaust tubes are very hot. Ron - Orange, CA


To get started, remove the filter you have now and test the suction directly at the tank again. Do you notice an increase? If not, look up above the the filter for a small foam filter. If you have one remove it and do not replace it.

Multiple Motor Unit, Low Suction

I have a SilentMaster S3 that suddenly (last week)has low suction. I have emptied the bag and checked all the ports inside the house to make sure they are all closed. I tried the vacum again today (5 Days later) thinking maybe something is clogging up the pipes and now I am hearing a loud noise from the unit in the garage. The suction is still low. What could be the problem? Patti, Edmond


It sounds like one or both of the motors are bad. We suggest replacing both SilentMaster S3 motors to resolve your low suction issue.

New Inlets, Lost Suction

I recently replaced 3 of 6 inlet valves on my Sears system, model 40534 with what appears to be the exact same type (your part #651HW) and am now experiencing low suction. Is it the valves, the way I put them in or a coincidence? Natalie, Brookeville


If the new inlets were at fault, you would be hearing air leaks in the wall. If you don't, it is something else such as a clog or a bad motor. Go through the steps on our Troubleshooting Flowchart to isolate the issue and find a solution.