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Navien Boiler: Remove a cascade (Cascade System Removal)

Updated · by Aurora Star Tech Inc.

Remove a cascade (Cascade System Removal) on a Navien boiler: On the main unit it ends the cascade; on a sub unit it drops that one unit.

Homeowner with a boiler problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: Navien NHB-H condensing boilers: NHB-150H, NHB-110H, NHB-080H, NHB-055H

How to fix remove a cascade (cascade system removal): step by step

  1. Hold Back and Menu together for 3 seconds.
  2. Open 4. Cascade Status and Settings.
  3. Choose 2. Cascade System Removal.
Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

If the unit shows an error code, look it up: Navien Boiler codes

Models

NHB-055HNHB-080HNHB-110HNHB-150H

Source: Navien NHB-H Installation and Operation Manual, 8 Installing a Cascade System p.72-76; 11.13.4 Configuring a Cascade System p.114-115. Written in our own words as a summary; always check the original manual.

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.

© 2026 Aurora Star Tech Inc. All rights reserved. This page may not be copied, republished or used to train other systems without written permission.

Emergency Boiler Repair

647-657-2977