MD Central Vacuum
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Since 1961

Silent Master Central Vacuum Parts - Filters, Motors & Parts

Motor Replacement Tips

  • Dying motors just stop, but can randomly work.
  • Motor is usually dead if you only hear a click or smell electrical.
  • Motor replacement instructions here. Skill level medium.
  • Find a replacement motor using the model search below.

Maintenance Tips for Silent Master

Filtration for Silent Master Central Vacuum

Closed Bags

Closed Bags

Some units utilize the single entry closed filtration bags pictured here. Buy closed bags.

Open Top Bags

Open Top Bags

More commonly used genuine Hyperflow bags come in 8-gallon and 12-gallon options.

Tru-Seal Bags

Tru-Seal Bags

Convert your dusty, open top filtration to a completely encapsulating, hypoallergenic filtration system. It even connects to the utility port! Buy the Tru-Seal Upgrade Kit now. Also available are the Replacement Tru-Seal Bags.

Filters, Motors & Parts for Silent Master Vacuum Power Units

Search Model Number:
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(Results include all instances, not just model number.)
Model # Motor 1 Motor 2 Filter Circuit Board
Silent Master S1
110-120 volts
S1
Motor 201S Details & Instructions
(Quantity 1)
201S
None
Filter: HyperFlow 720H-5
HyperFlow 720H-5

Board 235S
235S
Silent Master S1 Foreign
220-240 volts
S1 Foreign
Motor 202A Details & Instructions
(Quantity 1)
202A
None
Filter: HyperFlow 720H-5
HyperFlow 720H-5

Board 236S
236S
Silent Master S2
110-120 volts
S2
Motor 202G Details & Instructions
(Quantity 2)
202G
Motor Alternate: 205 Details & Instructions
Alternate: 205
More power, also a bit louder
Filter: 720HF-5
720HF-5

Board 235M
235M
Silent Master S2
220-240 volts
S2
Motor 202A Details & Instructions
(Quantity 2)
202A
None
Filter: 720HF-5
720HF-5

Board 236M
236M
Silent Master S3
110-120 volts
S3
Motor 201S Details & Instructions
(Quantity 2)
201S
None
Filter: 720HF-5
720HF-5

Board 235M
235M
Silent Master S3
220-240 volts
S3
Motor 202B Details & Instructions
(Quantity 2)
202B
None
Filter: 720HF-5
720HF-5

Board 236M
236M
Silent Master S4
110-120 volts
S4
Motor 199R Details & Instructions
(Quantity 1)
199R
None
Filter: 720HF-5
720HF-5

Board 235S
235S
Silent Master S4
220-240 volts
S4
Motor 199RX Details & Instructions
(Quantity 1)
199RX
None
Filter: 720HF-5
720HF-5

Board 236S
236S
Silent Master S44
110-120 volts
S44
Motor 199B Details & Instructions
(Quantity 1)
199B
None
Filter: 720HF-5
720HF-5

Board 235S18
235S18
Silent Master S460r
110-120 volts
S460r
Motor 199R Details & Instructions
199R
None
Filter: 720TS-3
720TS-3

Board 235S
235S
Silent Master S5
110-120 volts
S5
Motor 199R Details & Instructions
(Quantity 2)
199R
None
Filter: 720HF-5
720HF-5

Board 235L
235L
Silent Master S5
220-240 volts
S5
Motor 199RX Details & Instructions
(Quantity 2)
199RX
None
Filter: 720HF-5
720HF-5

Board 236L
236L
Silent Master S500r
110-120 volts
S500r
Motor 202G Details & Instructions
202G
None
Filter: 720TS-3
720TS-3

Board 235M
235M
Silent Master S560r
110-120 volts
S560r
Motor 202C2 Details & Instructions
(Quantity 1)
202C2
None
Filter: 720TS-3
720TS-3

Board 235S
235S
Silent Master S560r2
220-240 volts
S560r2
Motor 202CX Details & Instructions
None
Filter: 720TS-3
720TS-3

Board 236S
236S
Silent Master S720r2
220-240 volts
S720r2
Motor 202A Details & Instructions
202A
None
Filter: 720TS-3
720TS-3

Board 236M
236M
Silent Master S900r
110-120 volts
S900r
Motor 199R Details & Instructions
199R
None
Filter: 720TS-3
720TS-3

Board 235L
235L
Silent Master S900r2
220-240 volts
S900r2
Motor 199RX Details & Instructions
199RX
None
Filter: 720TS-3
720TS-3

Board 236L
236L
Silent Master SP2
110-120 volts
SP2
Motor 201P Details & Instructions
(Quantity 1)
201P
None
Filter: 720HF-5
720HF-5

Board 235S
235S
Silent Master SP2
220-240 volts
SP2
Motor 201PX Details & Instructions
(Quantity 1)
201PX
None
Filter: 720HF-5
720HF-5

Board 236S
236S
Silent Master SP22
110-120 volts
SP22
Motor 201P Details & Instructions
(Quantity 2)
201P
None
Filter: 720HF-5
720HF-5

Board 235M
235M
Silent Master SP22
220-240 volts
SP22
Motor 201PX Details & Instructions
(Quantity 2)
201PX
Replaces 119389
None
Filter: 720HF-5
720HF-5

Board 236L
236L
Silent Master SP3
110-120 volts
SP3
Motor 203P Details & Instructions
(Quantity 1)
203P
None
Filter: 720HF-5
720HF-5

Board 235S
235S
Silent Master SP3
220-240 volts
SP3
Motor 203PX Details & Instructions
(Quantity 1)
203PX
None
Filter: 720HF-5
720HF-5

Board 236S
236S

Only hear a "click" at the motor when trying to start the Silent Master system? Or, does it shut off and start back up in a few minutes? These are common signs of a dead motor, which leaves two options: replace the motor or replace the unit. If you liked the amount of suction the Silent Master model had, then replace the motor using the information above. If you'd like stronger suction, or a cleaner disposal system, then consider a different unit or alternative brand from MD Vacuum. Our units are Assembled in the USA with the finest materials and backed with excellent customer service.

Filtration Maintenance

Much like a regular portable vacuum, the basic maintenance of a Silent Master Central Vacuum System is changing the bag, or, in most cases, emptying the dirt receptacle on the main unit. To do this, remove the base of the unit with a twist or by unlatching, then dump the debris and put a plastic bag over the bottom and shake the center-weighted cloth filter. On top emptying models simply open the top and remove the bag. On bottom models without a cloth filter, reach up and remove the mesh filter or clean the debris screen. Some models may have a foam filter that can be removed and washed and completely air dried.

Silent Master Main Motor Maintenance

How a Vacuum Motor Works

All Silent Master units used permanently sealed motors in their main collection unit. They require no lubrication or oiling. Routine maintenance for typical residential usage should include checking the motor brushes approximately every five years. While checking the motor brushes, make sure the center motor shaft is solid and has no play or wobble. If it does, the bearings are going out and the motor will need to be replaced. If the motor brushes are worn to 3/16 inch long, replace the motor brushes.

If the unit does not have any paper or cloth bag filtration, then a certain volume of debris may accumulate on the motor's internal fan blades. This is not easy to remove and any attempt to remove it has the high possibility of offsetting the balance of the fans. An imbalanced fan causes premature motor failure on the motor bearings.

Here are instructions for checking and replacing vacuum motor brushes. Motor brushes conduct electricity into the motor while touching the center shaft. Over time, they wear down. If they wear all the way down, they can damage the motor.

Click on the image above to understand how a vacuum motor works.

Silent Master Pipe System Maintenance

Silent Master Vacuum Pipe Maintenance Sheets

The pipes in your system should last for the lifetime of your home if properly installed. If black carbon dust has gathered on the exterior of the pipes through static electricity, it can removed with a damp, soapy cloth.

We recommend cleaning out the interior of the piping system at least once per year. The most effective method is with Free Flow Central Vacuum Maintenance Sheets. They do a couple of things. As the sheets are pulled through the pipes, they push along all kinds of items that sit in dead spots, as well as deodorize the hose, pipes, and unit. Some amazing things can be pushed out from your Silent Master Central Vacuum pipes, resulting in better suction. We have seen Match Box Cars, C02 cartridges, pencils, rocks, paper clips, and huge clumps of nasty debris.

Silent Master Vacuum Hose Maintenance

Your vacuum hose will last longer if it is stored on a hose hanger, always being detached from the vacuum after each use. Simply create four or five loops and hang it up. Consider a Hose Cover to protect the hose and your baseboards. See if any of these Storage Items can help your situation. Consider hose hangers, wand hangers, hose straps and more. You can get everything off the floor for a more organized closet.

Reminder Emails Sent to Empty Your Silent Master Vacuum

Silent Master Filtration Empty Reminder

Sign up for Free Quarterly Email Reminders to remind you to dispose of your central vacuum debris. Operating your unit with a full filter can reduce suction, making the unit run hotter and clean less efficiently. Your email will not be used for any other purpose, or be sold or borrowed. We simply want to help you remember to keep your Silent Master Central Vacuum working at its top performance.

(The image above does not reflect all types of central vacuum filtration.)

Click Here to Start Your Reminders.

Troubleshooting Your Silent Master Central Vacuum

Silent Master Vacuum Troubleshooting and Repair

Self diagnose your system using this Interactive Troubleshooting and Repair Solutions Guide for Silent Master Central Vac. We guide you through a simple, methodical deduction of tests and symptoms to find the problematic source of anything from:

We then offer a description of the problem and solutions to repair your Silent Master Central Vacuum. We also have 100s of local, independent dealers you can reach out to for help.

Visit the Troubleshooting and Repair Solutions Guide for Silent Master Central Vacuum

Silent Master Central Vacuum Motor Replacement

Silent Master Vacuum Motor Replacement Help

You have a couple of options when it comes time to replace the motor on your Silent Master Central Vacuum. Contact a local dealer for service, or consider doing it yourself. Motors on the Silent Master vacuum have a few fasteners and wires that need to be unattached, then reattached on the new motor. It should take less than one hour to change your motor(s). Here is a quick "how-to" change your motor:

  1. Use the Silent Master Motor Replacement Parts Chart to find the right replacement motor for your Silent Master model. When your new motor arrives, take some photos of your original motor so you remember how it was wired and secured.
  2. Turn off the circuit breaker or unplug the central vacuum unit.
  3. Access the motor by releasing the outer housing (usually a few screws around the perimeter). Remove the motor and unclip the motor wires from the components.

    Note: Your new motor may not have the correct wire ends. If that is the case, we recommend cutting the wires from the old motor and wire nutting the new motor wire to the old motor wire. Using the original wire with the correct end to attach to the components makes your job a lot simpler and the connections safe and secure.

Note that a motor may have many numbers on it, but typically the complete motor number starts with "11" followed by 4 more numbers and maybe a dash with two more numbers (e.g. 115334-00). Years ago, they didn't put the complete part number on the motor.

For more information, see our detailed Silent Master Motor Replacement Instructions.

Circuit Board, Relay, Transformer, MiniBreaker

Silent Master Circuit Board Replacement

In 2004 all Silent Master Central Vacuums transitioned to an all-in-one control board. If your Silent Master Central Vacuum needs a new relay, transformer, mini breaker, or even a new control board or circuit board, use one of these powerful, durable, cost-saving central vacuum circuit boards. You save money, time, and headaches. The reality is, a central vacuum really only requires a motor and one circuit board. It is not terribly difficult to retrofit a circuit board. An electrician can do it in under an hour.

To find the circuit board you need, verify the number of motors in your unit and the amperage requirements. The most common board replacement for Silent Master Vacuums is the Vacuum Motor Circuit Board for Single Motor Units 110 Volt. For other voltages and motor configurations choose one of these Durable Generic Circuit Boards made by the industry leading manufacturer. Or, use your model number and the Motor Replacement Parts Chart for Silent Master to see our recommended circuit board. There are other Generic Circuit Boards for units with different voltage and multiple motors. Print and use the large photograph of the board as the wiring guide.

Older wiring diagrams for pre-board units:

Motor Brush Help for Silent Master Central Vacuum

Silent Master Motor Brush Help

The Silent Master motor has two carbon brushes in each motor that wear down but can be replaced before they damage the motor. Silent Master motor brushes should be checked every five years in typical residential applications and should be replaced if the 3/4 inch-long solid carbon "brush" is worn down to anywhere near 3/16 inch. Here are instructions for Checking and replacing vacuum motor brushes. Motor brushes conduct electricity into the motor while touching the center shaft. To find the replacement motor brush for your Silent Master Central Vacuum, type the motor replacement number (not brand model number) in the search box and the motor brush will come up in the search result; instructions are on the motor brush page.

Know that the Silent Master motor may go bad for other reasons, such as bad bearings or dust build-up in the motor (both are not repairable). If your motor brush doesn't show up under your original motor model number, replace the motor, not the motor brush.