NuTone Replacement Relay PC Board [0521B-000]

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NuTone Replacement Relay PC Board [235S]

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List Price: $99.95

Direct Price: $79.95

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Special Notes About This Item: There are no returns on this item.
If you are not comfortable with repairing electrical components we recommended contacting a licensed electrician to help with the install.

Installation Note: Some modifications to your central vacuum power unit may be required for the installation of this part.

Alternate SKU(s): 0521B-000, 87119000

Availability: Usually Ships in 24 Hours
Product Code: 235S

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Description

Other Information

Technical Specs

Replacement NuTone relay PC board.

Will fit the following models:

Fasco
- 851
NuTone
- 350
- 353
- CV350
- CV352
- CV353
- CV400
- CV400C
- CV550
- CV553
- CV653

Please Note:

The blue power lead wire has been changed to a black lead wire and the red lead wire connected to the switch has been changed to a yellow lead wire.
For models manufactured after May 1997, two additional lead wires are provided. If your unit was made prior to that these wires are not used and should be removed from the terminal connection.

Additional Information

This PC board is a great replacement for 110V, single-motor model central vacuums with a single control board or separate relay. Retrofitting may be required for the install.

This model contains a relay, transformer, a 15A mini breaker and two pairs of low voltage leads.

The PC board is 2" high from the base of the board to the top of the reset button. The reset button and the low voltage stems are both threaded. When the two stems are put through the holes in the body of the unit, they hold the board in place with two included mounting nuts. If the unit does not already have a proper mounting hole for the installation you can use a drill and step bit to create one.

Please Note: As this is an electrical part, please take proper precautions before installation. The entire process should take less than an hour.
Wiring locations on the board:
1. LINE: The 110V line from the power cord
2. NTL: The neutral wire from the power cord
3. MOTOR: Connect either wire from the motor to this contact
4. MOTOR: Connect the other wire from the motor to this contact
5. Black Tower: Low voltage wires from the home will attach to the two 1/4" male flag connectors inside the black tower part of the board.
6. Yellow Wires: Connect to an on/off low voltage switch on the side of the tank or are unused

Average Customer Review: Average Customer Review: 4.5 of 5

4.5 of 5 Total Reviews: 24 Write a review.

0 of 0 people found the following review helpful:

	July 9, 2026
Reviewer: Donald Mueller from New Leipzig, ND United States

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0 of 0 people found the following review helpful:

They know the central vac business	March 26, 2026
Reviewer: Richard Cain from Upton, MA

Great customer service and they know the central vac business. Looking for control board for my 25+ year old NuTone central vacuum. Other sites and companies just said "sorry discontinued - no replacement". Centralvacuumdirect provided a replacement relay board and even suggestion instructions on how to install. Immediate reply and quick free shipping at a reasonable price. After wiring and slight mounting modification - Worked Perfectly! Couldn't ask for more, highly recommended.

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0 of 0 people found the following review helpful:

Perfect Replacement	November 21, 2025
Reviewer: Mark from Tampa, FL

This board fit perfect and super easy install on my 25+ year old NuTone CV653. There is no OEM part available so I gave this generic replacement a shot. $80 and 30 minutes and back in service. My symptom was the central vac was cycling on and off every few seconds during use. I snipped the wires off the motor unit and attached a cord and plug and plugged it directly into the electrical outlet. Motor ran fine which zeroed me in on this PC board with the relay. Any mediocre handy person can install it. These guys were great assisting me to the right part.

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0 of 0 people found the following review helpful:

	July 28, 2025
Reviewer: Donald Binette from Biddeford, ME United States

No hassle. Prompt delivery. Will use again in the future

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0 of 0 people found the following review helpful:

	July 19, 2025
Reviewer: Patrick Quadrini from Glen Gardner, NJ United States

Part didn't remotely look like anything in the vacuum. Your return policy is horrible and I have to eat the $80 the part cost me even though I never hooked it up and barely took it outof the bag. I Won't be doing business with you again.

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