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GoodKnight 420E Auto CPAP Machine

This is an auto-adjusting CPAP machine which is set for a range of pressures, then seeks out and delivers the lowest level of pressure needed to keep the airway open. The pressure level will vary as needed, but it will not lower with each exhalation as a bilevel does. The auto-adjusting CPAPs were designed for patients who are unable to participate in a sleep study or whose pressure needs vary during the night according to their stage of sleep or sleep position. However, any patient will receive very comfortable therapy from this type of CPAP.

Manufactured by Puritan Bennett.

Item #Y-GK420ENA

This product no longer available and this information is for reference only. Newer Model Available: Sandman Auto HC CPAP Machine with Built In Heated Humidifier.
Replacement Parts

Have a question? Call us!

1-800-356-5221(Mon-Fri 8AM-10PM CST, Sat 8AM-6PM CST)

Important Tips

This small CPAP has been very popular because of the size and weight, especially as a second machine for travelers, but it can certainly be your 'every night' machine with as long a life expectancy as any other CPAP. It is a great product.

The GoodKnight 420E Auto CPAP is capable of recording information about your sleep, such as snoring or apnea events, as well as pressure delivery response. The information can be downloaded with the purchase of the SilverLining Data Management software and cable.

The GoodKnight 420E Auto CPAP can be used with a separate passover or heated humidifier.

CPAP machines come with a six foot hose, a travel bag and manuals. Masks are not included and must be purchased separately. We will be happy to help you with sizing and offer suggestions on current popular masks.

The 420 line of machines can experience power problems when used with a Full Face Mask at pressures exceeding 15 CM/H2o. If you wish to use this mask configuration, please consider a different machine.

Error Note: If the machine displays an error 7 or "ER 7" this indicates an issue internally with the machine's blower. You can contact the provider of the machine to seek service if it is available, or the machine may need to be replaced.

Manufacturer Warranty
This machine comes with a 2 Year Manufacturer Warranty. will work with the manufacturer on your behalf if the machine needs repairs. Please follow these steps:

  • Contact us at or 1-800-356-5221 to receive an RMA (Return Merchandise Authorization) Number before returning the equipment
  • Include a note with the machine describing the issue you are experiencing, along with your full contact information to include a return shipping address and the RMA number provided to you
  • Ship only the defective items to at 10101 Stafford Centre Drive, Stafford, TX 77477
  • Do not return accessory items such as the carry bag, hose or power cords
  • Loaner Machines are available for rental during the warranty process
  • Email updates will be sent to keep you informed as the machine moves through the warranty process
  • will contact the manufacturer on your behalf and handle all shipping between us and the manufacturer
  • The repaired or replaced unit will be returned to you. Shipping charges may apply.

Please note: The manufacturer warranty is voided by water damage or misuse of the machine.