Access & passwords: Boiler tips

Short, practical technician tips on access & passwords for boiler. Check each one against the manual for your exact model before acting.

Open the service functions (Greenstar service button)

Bosch · Greenstar ZBR/ZWB 21-42-3A wall-hung boilers and ZWB 28-42-3A combis

Holding the service button until it lights opens the service functions; the display shows a function number such as 1.A. Second-level functions (8.A onward) need ECO + key pad lock together. Service mode times out after 15 minutes without a button press.

1. Keep the service button pressed until it lights
2. Scroll with the key pad lock button (down) or ECO button (up)
3. Tap the emissions test button to see a value; change it with the same two buttons
4. Hold the emissions test button to save, or press it briefly to leave without saving
5. Second level: with the service button lit, press ECO and key pad lock together until 8.A shows

Installer Menu access

Glow Brand · All C95 and C140 units

The Installer Menu is protected by a 4-digit password. Installers who need it must contact Glow Brand technical support for the code.

1. From the main screen press RESET/ENTER to open the main menu.
2. Press DHW up or down to reach the CodE sub menu, then press RESET/ENTER.
3. Enter each of the four digits with DHW up/down and save each with RESET/ENTER; the fourth press opens the Installer Menu.

Open the Installer Menu (CodE, password 0300)

Glow Brand · B85, B120, B160 (NG and LP)

Installer parameters (2.xxx) sit behind a 4-digit code entered in the CodE sub menu. The code is 0300 (not printed in the manual; from Glow Brand). Entering it also makes the System Test (0.200) visible in the user menu.

1. From the main screen press RESET/ENTER to open the main menu.
2. Press DHW up until CodE is highlighted, then RESET/ENTER.
3. Enter 0 - 3 - 0 - 0: set each digit with DHW up/down and confirm with RESET/ENTER; after the fourth digit the Installer Menu (2.000) opens.
4. Back out one level with CH up or CH down. The menu closes by itself after 4 minutes without a key press.

Menu access codes

HTP · EL-80, EL-110, EL-150, EL-220, EL-299, EL-399 (N/LP)

Boiler menu code 600, system menu code 925.

1. Hold ENTER over 4 seconds until ENTER MENU CODE shows
2. Use the arrows to key in the code
3. Press ENTER
4. 600 gives the boiler settings, 925 gives system settings
5. No programming while a call is active

Change installer parameters (password 1234)

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

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.

Open the service / installer menu (Back + Menu)

Navien · NHB-055H, NHB-080H, NHB-110H, NHB-150H

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.

Access installer parameters in the boiler menu

NTI · TRX150, TRX199, TRX199C

Boiler parameters are reached through the menu. Menu 2 holds the boiler parameters, and the sub-menus hold the power and ignition settings.

1. Go to menu 2 (Boiler Parameters).
2. Select the sub-menu: sub menu 2 for ignition power (parameter 220), sub menu 3 for maximum heating power (parameter 231) and heating ignition delay (parameter 2.3.5).
3. Make changes as listed in the power table, then check the result.

Access the technical menu

NTI · NTI TRX boilers, service access

Technical menu is for qualified technicians only. The access code must be entered before the protected menus open. Example below changes parameter 231 from 100 to 96.

1. Open the cover.
2. Press OK and ESC together for 5 seconds. Display shows 222.
3. Press + to select 234 (service code).
4. Press OK. Press + until display shows MENU, then press OK.
5. Press OK to open menu 0. Press + to select menu 2, then press OK.
6. Press OK to open sub-menu 20. Press + to select sub-menu 23, then press OK.
7. Press OK to open parameter 231.
8. Press OK to show the current value (100 in example).
9. Press + or - to change the value (96 in example).
10. Press OK to save, or ESC to exit without saving.
11. Press ESC until the normal display returns.

Navigate the user menu

NTI · TRX150 user menu

The user menu is opened with a short press of MENU. Use + and - to move through items and parameters, OK to select, + and - to change, OK to save, and ESC to leave without saving. For parameters 4 to 11, the same settings can be made for Zones 2 and 3 where applicable. Zone 3 needs an optional NTI zone controller. Pressing HISTORY after opening a parameter shows the zone number next to the heating symbol.

1. Press MENU to open the user menu.
2. Press + or - to scroll to the item.
3. Press OK to select the parameter.
4. Press + or - to change the value.
5. Press OK to save, or ESC to exit without saving.
6. For zones 2 and 3 on parameters 4 to 11, press HISTORY after opening the parameter to pick the zone.

Open the complete technical menu

NTI · TRX boiler control and display

Hold OK and ESC together for 5 seconds to open the service entry screen (it shows 222). Use + to pick the service code 234, press OK, then scroll with + until MENU appears and press OK to enter the complete menu.

1. Hold OK and ESC together for 5 seconds until the display shows 222.
2. Press + to select 234, the service code.
3. Press OK, then press + until the display shows MENU.
4. Press OK to enter the complete menu.

Program module restore - login password

NTI · Trinity Tft60, Tft85, Tft110, Tft155, Tft175, Tft200, Tft250, Tft300, Tft399

Restoring non-safety settings from a program module (PIM) needs the password.

1. Home - Configure - Display Setup - Program Module
2. Touch Login and enter: sola
3. Touch Restore Parameters and confirm Yes

Purge function access

NTI · TRX150 and related TRX models

The purge cycle can be run at any time from the front panel.

1. Press and hold ESC for 5 seconds to start the purge function.
2. Press ESC to exit.

Open the installer level (code C123)

Rinnai · E50CRN; E75CRN; E75CRP; E110CRN; E110CRP

The Control Tower hides installer chapters behind an access code. Once entered, PARA, SERV and the rest become available; the control drops back to user level after 20 minutes without a key press.

1. Hold MODE for 5 seconds until COdE shows
2. Use + and - to dial C123
3. Press STORE to confirm

Open the parameter settings menu on the PC board

Rinnai · Rinnai I-Series Plus boilers and combis (150K and smaller, 175K and higher)

Installer menu for changing boiler parameters; only change what an instruction tells you to change.

1. Remove the front panel; the PC board is at the lower left.
2. Press and hold the left SW1 button for 5 seconds.
3. Use the up and down arrows to scroll to the parameter, then press Select.
4. Change the value and press Select to store it.
5. Press the left SW1 button to leave the menu.

Open the Service menu (password viservice)

Viessmann · Vitodens 200-W B2HE 85, 120, 150, 199

The touchscreen Service menu holds diagnosis, actuator test, parameters, message history and service functions. It closes on its own after 30 minutes.

1. Menu > Service
2. Enter the password viservice (factory default)
3. If passwords were changed and lost, Viessmann Technical Service issues a master password