HVACopedia

Navien · technician tips

Navien service menus, test modes and resets

45 tips for boiler, combi boiler, tankless water heater: access codes, button combinations, test modes and the resets you need at the appliance.

Jump to: Access & passwords (8) · Service & test modes (10) · Reset & cancel (7) · Settings shortcuts (10) · Commissioning (3) · Other (7)

Access & passwords

Installer and service menu codes, and how to get into them.

Change installer parameters (password 1234)

Boiler · Navien NHB-H

Installer parameters sit behind a password in the service menu.

  1. Hold Back + Menu for 3 seconds and open 3. Parameter Settings.
  2. Enter the factory password 1234.
  3. Edit the value; it saves after 10 seconds with no input.

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

Source: Navien NHB-H Installation and Operation Manual, 11.13.3 Setting the Operation Parameters, p.111-114. Written in our own words; check the manual for your exact model.

Open the service / installer menu (Back + Menu)

Boiler · Navien NHB-H

Hidden advanced menu with Service Status Info, Input/Output Status and Parameter Settings.

  1. Hold Back and Menu together for 3 seconds.
  2. Choose an entry with the Command dial.
  3. Press Back to return.

Applies to: NHB-055H, NHB-080H, NHB-110H, NHB-150H

Source: Navien NHB-H Installation and Operation Manual, 11.13 Accessing Advanced Menu Items, p.109-111. Written in our own words; check the manual for your exact model.

Change installer parameters (password 1234)

Combi boiler · Navien NCB-H

Installer parameters sit behind a password in the service menu.

  1. Hold Back + Menu for 3 seconds and open 3. Parameter Settings.
  2. Enter password 1234.
  3. Edit the value; it saves after 10 seconds with no input.

Applies to: NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H

Source: Navien NCB-H Installation & Operation Manual, 11.6.3 Setting the Operation Parameters, p.121-124. Written in our own words; check the manual for your exact model.

Open the service / installer menu (Back + Menu)

Combi boiler · Navien NCB-H

Hidden menu reached by holding Back and Menu; it holds parameter settings, test mode, special operations and air purge.

  1. Hold Back and Menu together for 3 seconds.
  2. Choose the entry with the Command dial (3. Parameter Settings, 6. Test Mode, 7. Special Operations, 8. Air Purge Mode).
  3. Press Back to leave.

Applies to: NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H

Source: Navien NCB-H Installation & Operation Manual, 11.6.3 Setting the Operation Parameters, p.121-124. Written in our own words; check the manual for your exact model.

Change installer parameters (password 1234)

Tankless water heater · Navien NPE-2

Operating parameters 1-16 are changed from the Installer Menu, which asks for the installer password.

  1. Hold Menu and Back together for 3 seconds.
  2. Open 1. Installer Menu and enter password 1234.
  3. Choose 2. Parameter Settings and edit the parameter.
  4. The value saves by itself after 10 seconds with no input.

Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2

Source: Navien NPE-A2/S2 Installation Manual, 7.5.1.2 Setting the Operation Parameters, p.99-100. Written in our own words; check the manual for your exact model.

Change the installer password

Tankless water heater · Navien NPE-2

The installer password is changed in the installer menu; the factory value is 1234.

  1. Hold Menu and Back together for 3 seconds.
  2. Open 1. Installer Menu and choose 7. P/W Change.

Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2

Source: Navien NPE-A2/S2 Installation Manual, 7.4.2 p.95-96; 7.5 p.98-99, p.105-107. Written in our own words; check the manual for your exact model.

Open the R&D information menu (key sequence)

Tankless water heater · Navien NPN

Hidden menu with 1 Technical Information and 2 Parameter Information (2.PAR); it returns to the menu after 5 minutes without key input.

  1. Press Power to turn the heater off.
  2. Press Up (+) 3 times, Down (-) 3 times, then Up (+) 4 times.
  3. Use Up/Down to choose 2.PAR, press Info.
  4. Reset goes back one level.

Applies to: NPN-160U/180U/199U, NPN-120E/160E/180E/199E

Source: Navien NPN-U/NPN-E Installation Manual, 3.4.3 Adjusting the Recirculation Parameters, p.28. Written in our own words; check the manual for your exact model.

Open the service / installer menu (Menu + Back)

Tankless water heater · Navien NPE-2

Hidden menu that holds the installer menu, cascade setup, test mode and special operations.

  1. Hold Menu and Back together for 3 seconds.
  2. Choose Installer Menu, Cascade Status and Set, Test Mode or Special Operations with OK.
  3. Press Back to leave.

Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2

Source: Navien NPE-A2/S2 Installation Manual, 7.4.2 p.95-96; 7.5 p.98-99, p.105-107. Written in our own words; check the manual for your exact model.

Service & test modes

Forced fan, low and high fire, test and diagnostic modes, error history and live data.

Force a fixed firing rate with DIP switch 1

Boiler · Navien NHB-H

Switches 1 and 2 of the first DIP bank hold the burner at minimum or maximum for testing; leave them OFF/OFF for normal operation.

  1. Turn power off before removing the front cover to reach the DIP switches.
  2. 1 ON, 2 OFF = 2-stage MAX.
  3. 1 OFF, 2 ON = 1-stage MIN.
  4. 1 ON, 2 ON = 1-stage MAX.
  5. Return 1 and 2 to OFF/OFF for normal operation.

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

Source: Navien NHB-H Installation and Operation Manual, 6.1 DIP Switch 1, p.67. Written in our own words; check the manual for your exact model.

Force minimum or maximum firing (special operations)

Boiler · Navien NHB-H

Special operations hold the burner at a fixed rate; they return to normal automatically after 3 hours.

  1. Hold Back and Menu together for 3 seconds.
  2. Choose 7. Special Operations.
  3. Pick Normal, 1st MIN, 1st MAX, 2nd MIN or 2nd MAX.

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

Source: Navien NHB-H Installation and Operation Manual, 11.7 Viewing Basic Information p.103-104; 11.13 Advanced Menu p.109-118; 11.10 p.108. Written in our own words; check the manual for your exact model.

Purge air from the heating or DHW piping (Air Purge Mode)

Boiler · Navien NHB-H

Air purge mode returns to normal by itself after 15 minutes.

  1. Hold Back and Menu together for 3 seconds.
  2. Choose 8. Air Purge Mode.
  3. Pick SH pipe or DHW pipe air purge.

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

Source: Navien NHB-H Installation and Operation Manual, 11.7 Viewing Basic Information p.103-104; 11.13 Advanced Menu p.109-118; 11.10 p.108. Written in our own words; check the manual for your exact model.

Run test mode (fan, pumps, zone valves, venturi)

Boiler · Navien NHB-H

Test mode switches individual outputs so you can check them one at a time.

  1. Hold Back and Menu together for 3 seconds.
  2. Choose 6. Test Mode.
  3. Pick the output: fan motor ramp, boiler/system/zone/DHW pumps, zone valves or dual venturi.

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

Source: Navien NHB-H Installation and Operation Manual, 11.7 Viewing Basic Information p.103-104; 11.13 Advanced Menu p.109-118; 11.10 p.108. Written in our own words; check the manual for your exact model.

Force a fixed firing rate with DIP switch 1

Combi boiler · Navien NCB-H

Switches 1 and 2 of the first DIP bank hold the burner at minimum or maximum for testing; leave them OFF/OFF for normal operation.

  1. Turn power off before removing the front cover to reach the DIP switches.
  2. 1 ON, 2 OFF = 2-stage MAX.
  3. 1 OFF, 2 ON = 1-stage MIN.
  4. 1 ON, 2 ON = 1-stage MAX.
  5. Return 1 and 2 to OFF/OFF for normal operation.

Applies to: NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H

Source: Navien NCB-H Installation & Operation Manual, 6.1 DIP Switch 1, p.76. Written in our own words; check the manual for your exact model.

Force minimum or maximum firing (special operations)

Combi boiler · Navien NCB-H

Special operations hold the burner at a fixed rate for gas pressure and CO2 checks; they return to normal after 3 hours with no input.

  1. Hold Back and Menu together for 3 seconds and choose 7. Special Operations.
  2. 1. Normal returns to normal operation.
  3. 2. 1st MIN / 4. 2nd MIN: minimum firing (low-fire CO2 / offset).
  4. 3. DHW 1st MAX / 5. DHW 2nd MAX: DHW maximum firing.
  5. 6. SH 1st MAX / 7. SH 2nd MAX: SH maximum firing (inlet gas pressure, high-fire CO2).

Applies to: NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H

Source: Navien NCB-H Installation & Operation Manual, 11.6.6-11.6.8, p.125-128. Written in our own words; check the manual for your exact model.

Purge air from the heating piping (Air Purge Mode)

Combi boiler · Navien NCB-H

Air purge mode ends by itself after 15 minutes.

  1. Hold Back and Menu together for 3 seconds and choose 8. Air Purge Mode.
  2. Choose 1. SH pipe air purge.

Applies to: NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H

Source: Navien NCB-H Installation & Operation Manual, 11.6.6-11.6.8, p.125-128. Written in our own words; check the manual for your exact model.

Run test mode (fan, pumps, valves, venturi)

Combi boiler · Navien NCB-H

Test mode switches individual outputs so you can check them one at a time.

  1. Hold Back and Menu together for 3 seconds and choose 6. Test Mode.
  2. 1. Fan Motor ramps the fan up to top speed and back down.
  3. 2-5. Boiler / Zone 1-3 pumps toggle on/off (zone pumps only in pump system).
  4. 6-8. Zone 1-3 valve output toggles (zone valve system only).
  5. 9. 3 Way Valve Output toggles the 3-way valve.
  6. 10. Flow Control Valve / 11. Mixing Valve drive open-closed-back and show FEEDBACK.
  7. 12. Dual Venturi / 13. Recirc. Pump toggle on/off.

Applies to: NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H

Source: Navien NCB-H Installation & Operation Manual, 11.6.6-11.6.8, p.125-128. Written in our own words; check the manual for your exact model.

Force minimum or maximum firing (special operations)

Tankless water heater · Navien NPE-2

Special operations hold the burner at a fixed firing rate for combustion checks.

  1. Hold Menu and Back together for 3 seconds and choose 4. Special Operations.
  2. Pick 1st MIN, 1st MAX, 2nd MIN or 2nd MAX.
  3. Choose 1. Normal to return to normal operation.

Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2

Source: Navien NPE-A2/S2 Installation Manual, 7.4.2 p.95-96; 7.5 p.98-99, p.105-107. Written in our own words; check the manual for your exact model.

Run test mode (fan, flow valve, venturi, pump, mixing valve)

Tankless water heater · Navien NPE-2

Test mode drives individual parts so you can check them one at a time.

  1. Hold Menu and Back together for 3 seconds and choose 3. Test Mode.
  2. 1. Fan Motor: fan ramps from 0 to max and back, repeating.
  3. 2. Water Flow Adjust Valve: full open to full close over about 12 s, shows 0-100%.
  4. 3. Dual Venturi: on when entered, Up/Down toggles on/off.
  5. 4. Pump (A2) / Ext. Pump (S2): runs 10 s, stops 5 s, 5 times (75 s).
  6. 5. Mixing Valve (S2 only): full open to full close over about 10 s, shows 0-56%.

Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2

Source: Navien NPE-A2/S2 Installation Manual, 7.4.2 p.95-96; 7.5 p.98-99, p.105-107. Written in our own words; check the manual for your exact model.

Reset & cancel

Clearing lockouts, service reminders and fault history; skipping purge or de-air programs.

Remove a cascade (Cascade System Removal)

Boiler · Navien NHB-H

On the main unit it ends the cascade; on a sub unit it drops that one unit.

  1. Hold Back and Menu together for 3 seconds.
  2. Open 4. Cascade Status and Settings.
  3. Choose 2. Cascade System Removal.

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

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; check the manual for your exact model.

Reset one parameter to its default

Boiler · Navien NHB-H

Returns a single installer parameter to its factory value.

  1. Open the parameter in edit mode (Back + Menu 3 s > 3. Parameter Settings).
  2. Hold Back for 5 seconds.

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

Source: Navien NHB-H Installation and Operation Manual, 11.13.3 Setting the Operation Parameters, p.111-114. Written in our own words; check the manual for your exact model.

Reset one parameter to its default

Combi boiler · Navien NCB-H

Returns a single installer parameter to its factory value.

  1. Open the parameter in edit mode (Back + Menu 3 s > 3. Parameter Settings).
  2. Hold Back for 5 seconds.

Applies to: NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H

Source: Navien NCB-H Installation & Operation Manual, 11.6.3 Setting the Operation Parameters, p.121-124. Written in our own words; check the manual for your exact model.

Cancel the cascade setting

Tankless water heater · Navien NPN

Undoes the main/sub pairing from the main heater.

  1. On the main unit hold Diagnostic + Reset for 5 seconds.

Applies to: NPN-160U/180U/199U, NPN-120E/160E/180E/199E

Source: Navien NPN-U/NPN-E Installation Manual, 5.2.1 Configuring the Communication Settings, p.58. Written in our own words; check the manual for your exact model.

Factory reset the panel and main controller

Tankless water heater · Navien NPE-2

Resets the panel and main controller parameters from the installer menu.

  1. Hold Menu and Back together for 3 seconds.
  2. Open 1. Installer Menu (password 1234).
  3. Choose 6. Factory Reset.

Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2

Source: Navien NPE-A2/S2 Installation Manual, 7.4.2 p.95-96; 7.5 p.98-99, p.105-107. Written in our own words; check the manual for your exact model.

Remove a cascade (Cascade System Removal)

Tankless water heater · Navien NPE-2

Cascade removal is under the Cascade Status and Set menu of the hidden service menu.

  1. Hold Menu and Back together for 3 seconds.
  2. Open 2. Cascade Status and Set.
  3. Choose 4. Cascade System Removal.

Applies to: NPE-A2, NPE-S2

Source: Navien NPE-A2/S2 Installation Manual, 3.8.2 and 5.2.1, p.61, 73. Written in our own words; check the manual for your exact model.

Reset one parameter to its default

Tankless water heater · Navien NPE-2

Returns a single installer parameter to its factory value without touching the others.

  1. Open the parameter in edit mode (Menu + Back 3 s > 1. Installer Menu > 2. Parameter Settings).
  2. Hold Back for 5 seconds while editing.

Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2

Source: Navien NPE-A2/S2 Installation Manual, 7.5.1.2 Setting the Operation Parameters, p.99-100. Written in our own words; check the manual for your exact model.

Settings shortcuts

Where the useful parameters live and what they are set to from the factory.

Change gas type with DIP switch 2

Boiler · Navien NHB-H

DIP switch 2 #1 sets natural gas or propane and must match the rating plate and the Start-up Wizard.

  1. Turn power off before removing the front cover.
  2. DIP switch 2, #1: OFF = natural gas, ON = propane.
  3. SW2 #1 must match the gas on the rating plate (E788 if wrong).

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

Source: Navien NHB-H Installation and Operation Manual, 6.2 DIP Switch 2, p.68-69; 3.5 Air Handler Interface p.28; 10 Installation Checklist p.96. Written in our own words; check the manual for your exact model.

Set the altitude with DIP switch 2

Boiler · Navien NHB-H

DIP switch 2 #2 and #3 select the altitude band.

  1. 0-1,999 ft: 2 OFF, 3 OFF.
  2. 2,000-5,399 ft: 2 ON, 3 OFF.
  3. 5,400-7,699 ft: 2 OFF, 3 ON.
  4. 7,700-10,100 ft: 2 ON, 3 ON.

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

Source: Navien NHB-H Installation and Operation Manual, 6.2 DIP Switch 2, p.68-69; 3.5 Air Handler Interface p.28; 10 Installation Checklist p.96. Written in our own words; check the manual for your exact model.

Change gas type with DIP switch 2

Combi boiler · Navien NCB-H

DIP switch 2 #1 sets natural gas or propane and must match the rating plate and the Start-up Wizard.

  1. Turn power off before removing the front cover.
  2. DIP switch 2, #1: OFF = natural gas, ON = propane.
  3. A gas type that does not match the rating plate can show E773/E788.

Applies to: NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H

Source: Navien NCB-H Installation & Operation Manual, 6.2 DIP Switch 2, p.76-77. Written in our own words; check the manual for your exact model.

Set the altitude with DIP switch 2

Combi boiler · Navien NCB-H

DIP switch 2 #2 and #3 select the altitude band.

  1. 0-1,999 ft: 2 OFF, 3 OFF.
  2. 2,000-5,399 ft: 2 ON, 3 OFF.
  3. 5,400-7,699 ft: 2 OFF, 3 ON.
  4. 7,700-10,100 ft: 2 ON, 3 ON.

Applies to: NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H

Source: Navien NCB-H Installation & Operation Manual, 6.2 DIP Switch 2, p.76-77. Written in our own words; check the manual for your exact model.

Adjust recirculation parameters P12, P14, P15

Tankless water heater · Navien NPN

Recirculation pump cycle, sampling time and differential OFF temperature are set in the R&D menu.

  1. Turn the unit off, press Up 3 times, Down 3 times, Up 4 times.
  2. Choose 2.PAR and press Info.
  3. Press Info to edit and use +/- to change; the value sends after Info or 10 s without input.
  4. Reset returns to the previous menu.

Applies to: Navien NPN non-condensing tankless water heaters: NPN-160U/180U/199U (universal, indoor or outdoor with vent kit) and NPN-120E/160E/180E/199E (outdoor only)

Source: Navien NPN-U/NPN-E Installation Manual, 3.4.2-3.4.3, p.26-29. Written in our own words; check the manual for your exact model.

Change gas type with the front panel DIP switch

Tankless water heater · Navien NPE-2

Front panel DIP switch 1 selects natural gas or propane; use it only after a gas conversion.

  1. Turn power off before changing DIP switches.
  2. Switch 1: OFF = natural gas (factory), ON = propane.
  3. Change it only after a gas conversion with the Navien kit; the unit shows E788 until the gas type is confirmed in the Start-Up Wizard.

Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2

Source: Navien NPE-A2/S2 Installation Manual, 3.8 Setting the DIP Switches, p.19, p.61; 8.1 p.112. Written in our own words; check the manual for your exact model.

Enable Commercial Mode (up to 185 F)

Tankless water heater · Navien NPE-2

Commercial Mode raises the allowed set temperature range; the front panel temperature lock must be off.

  1. Turn power off and set front panel DIP switch 2 (temperature lock) to OFF.
  2. Hold Menu + Back 3 s > 1. Installer Menu (password 1234) > 2. Parameter Settings.
  3. Open 12. Commercial Mode: Enable = 140-185 F, Disable = 97-140 F (default).

Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2

Source: Navien NPE-A2/S2 Installation Manual, 7.5.1.2 Setting the Operation Parameters, p.99-100. Written in our own words; check the manual for your exact model.

Lock the temperature setting (commercial lock, DIP switch 7)

Tankless water heater · Navien NPN

DIP switch 7 stops users changing the set temperature.

  1. Switch 7: OFF = temperature can be set, ON = temperature cannot be set.

Applies to: Navien NPN non-condensing tankless water heaters: NPN-160U/180U/199U (universal, indoor or outdoor with vent kit) and NPN-120E/160E/180E/199E (outdoor only)

Source: Navien NPN-U/NPN-E Installation Manual, 3.7 Setting the DIP Switches, p.19, p.48-49. Written in our own words; check the manual for your exact model.

Lock the temperature setting (front panel DIP switch 2)

Tankless water heater · Navien NPE-2

Front panel DIP switch 2 stops users changing the set temperature.

  1. Turn power off before changing DIP switches.
  2. Switch 2: OFF = temperature can be set, ON = temperature cannot be set.
  3. Keep it OFF if you want to use Commercial Mode.

Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2

Source: Navien NPE-A2/S2 Installation Manual, 3.8 Setting the DIP Switches, p.19, p.61; 8.1 p.112. Written in our own words; check the manual for your exact model.

Set the altitude setting

Tankless water heater · Navien NPE-2

Altitude is a numbered installer parameter on the NPE-2.

  1. Hold Menu + Back 3 s > 1. Installer Menu (password 1234) > 2. Parameter Settings.
  2. Open 14. Altitude Setting and pick 1 (0-2,000 ft), 2 (2,000-5,400 ft), 3 (5,400-7,700 ft) or 4 (7,700-10,100 ft). Default is 1.

Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2

Source: Navien NPE-A2/S2 Installation Manual, 7.5.1.2 Setting the Operation Parameters, p.99-100. Written in our own words; check the manual for your exact model.

Commissioning

Start-up and set-up steps that are easy to miss.

Set up a cascade (assign sub unit IDs)

Boiler · Navien NHB-H

The main boiler assigns IDs 1-16 to the sub boilers; only the main unit's settings are used. The Start function is available on NHB-110H/150H only.

  1. Hold Back and Menu together for 3 seconds on the main unit.
  2. Open 4. Cascade Status and Settings.
  3. Choose 1. Cascade System Setting and start it so the main assigns IDs to the subs.

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

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; check the manual for your exact model.

Set up a cascade (assign main and sub units)

Tankless water heater · Navien NPN

Two heaters are paired from their front panels; the main unit shows MA.00 and the sub unit SL.01.

  1. Main unit: hold Diagnostic + Up (+) for more than 5 s; MA.00 appears.
  2. Sub unit: hold Diagnostic + Down (-) for more than 2 s; SL.01 appears.
  3. Main unit: hold Diagnostic + Up (+) for 5 s again; displays return to temperature.

Applies to: NPN-160U/180U/199U, NPN-120E/160E/180E/199E

Source: Navien NPN-U/NPN-E Installation Manual, 5.2.1 Configuring the Communication Settings, p.58. Written in our own words; check the manual for your exact model.

Set up a cascade (assign sub unit IDs)

Tankless water heater · Navien NPE-2

Cascade units are linked with Ready-Link cables and the main unit hands out the sub unit IDs.

  1. Wire the cascade with Ready-Link cables and switch all units on.
  2. Main unit: hold Menu + Back 3 s, open 2. Cascade Status and Set > 3. Cascade System Setting, press OK at START.
  3. Sub unit: hold OK for 3 seconds; the panel shows 'ID 1. Allocated!' when the ID is received.

Applies to: NPE-A2, NPE-S2

Source: Navien NPE-A2/S2 Installation Manual, 5.2.1 Configuring the Communication Settings, p.73. Written in our own words; check the manual for your exact model.

Other

Everything else worth knowing at the appliance.

Check input and output states (Input/Output Status)

Boiler · Navien NHB-H

Shows whether the control sees or sends a signal: thermostat inputs, pumps, zone valves, HTL, dual venturi, LWCO, air handler and DHW priority.

  1. Hold Back and Menu together for 3 seconds.
  2. Choose 2. Input/Output Status.
  3. Scroll to the item you want to check.

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

Source: Navien NHB-H Installation and Operation Manual, 11.7 Viewing Basic Information p.103-104; 11.13 Advanced Menu p.109-118; 11.10 p.108. Written in our own words; check the manual for your exact model.

Read live data (Status Information menu)

Boiler · Navien NHB-H

Read-only list of boiler data items.

  1. Press Menu, choose 1. Status Information.
  2. Turn the Command dial to scroll, press it to see the value.
  3. Press Back to leave.

Applies to: NHB-055H, NHB-080H, NHB-110H, NHB-150H

Source: Navien NHB-H User's Information Manual (V1.0 Apr 2024), 3.3, p.13-14; Navien NHB-H Installation and Operation Manual, 11.7, p.103-104. Written in our own words; check the manual for your exact model.

Read the error history

Boiler · Navien NHB-H

Lists the 10 most recent errors, newest at the top.

  1. Press Menu, choose 4. Error History.
  2. Select an error and press the dial for details.
  3. Press Back to return.

Applies to: NHB-055H, NHB-080H, NHB-110H, NHB-150H

Source: Navien NHB-H Installation and Operation Manual, 11.10, p.108. Written in our own words; check the manual for your exact model.

Read live data (Status Information menu)

Combi boiler · Navien NCB-H

Read-only list of boiler operating data.

  1. Press Menu, choose 1. Status Information.
  2. Turn the Command dial to scroll items, press it to see a value.
  3. Press Back to leave.

Applies to: NCB-190/060H to NCB-250/150H

Source: Navien NCB-H User's Information Manual (V1.0 Apr 2024), 3.3 Accessing Basic Menu Items, p.12. Written in our own words; check the manual for your exact model.

Read the error history

Combi boiler · Navien NCB-H

The last 10 errors are listed in the menu.

  1. Press Menu.
  2. Choose 4. Error History to see the last 10 errors.

Applies to: NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H

Source: Navien NCB-H Installation & Operation Manual, 11.5.1 Viewing Basic Information, p.113-114. Written in our own words; check the manual for your exact model.

Read live data (Status Information menu)

Tankless water heater · Navien NPE-2

Shows live readings such as flow, temperatures, exhaust temperature, flame AD value, fan RPM, APS voltage, model, gas and firmware.

  1. Press Menu.
  2. Choose 2. Status Information and scroll to the reading.

Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2

Source: Navien NPE-A2/S2 Installation Manual, 7.4.2 p.95-96; 7.5 p.98-99, p.105-107. Written in our own words; check the manual for your exact model.

Read the error history

Tankless water heater · Navien NPE-2

The last 10 errors are listed in the menu.

  1. Press Menu.
  2. Choose 3. Error History to see the last 10 errors.

Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2

Source: Navien NPE-A2/S2 Installation Manual, 7.4.2 p.95-96; 7.5 p.98-99, p.105-107. Written in our own words; check the manual for your exact model.

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For licensed technicians. Installer menus, test modes and access codes change settings that affect safety; only use them if you are trained on the appliance and understand the result. Gas, electrical and refrigerant work must be done by a qualified, licensed person, and the manufacturer’s manual for the exact model and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.