Reset & cancel: Boiler tips

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

Reset the service-due indication (function 5.A)

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

Clears the service due indication that alternates on the display after the inspection interval.

1. Open service functions with the service button and scroll with key pad lock / ECO
2. Select 5.A and confirm to reset the indication

Restore factory settings (function 8.E)

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

Resets all boiler parameters, including all service functions, to factory settings. Re-enter the values from the commissioning report afterwards.

1. Press the service button until it lights, then ECO and key pad lock together for the second level
2. Scroll to 8.E and press the emissions test button; the display shows 00
3. Hold the emissions test button until the confirmation appears

Cancel the 14-minute de-air sequence

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

On every power-up (parameter 2.139 = 1) the control runs a 14-minute de-air cycle (dAir) and ignores calls. If the system is already purged you can skip it.

1. Hold CH down and DHW down together for at least 3 seconds while dAir shows.
2. To change when it runs: 2.139 = 0 runs it every 24 h, 1 after every power cycle (default), 2 disables it.

Clear a lockout

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

Hard lockouts (Loc) are not cleared by cycling power.

1. Hold RESET/ENTER for at least 2 seconds on the display.
2. For software lockouts also press the small reset button on the back of the ICB.
3. Too many resets in a row triggers Err 134; then cycle power and fix the real cause.

Reset the service reminder

Glow Brand · All C95 and C140 units

A wrench icon appears every 365 days as a service reminder. It is cleared through the installer menu.

1. Enter the Installer Menu.
2. Go to parameter 2.203.
3. Change the value to RESET and save it with RESET/ENTER.

Reset the service reminder (wrench icon)

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

A blinking wrench means the service interval has elapsed.

1. In the installer menu open 2.203 and choose Reset (the parameter can also be switched On/Off).
2. 204 sets the interval in days (30-1275, default 1000).

Reset a lockout

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

How to clear fault lockouts.

1. Fix the cause first
2. Press RESET for more than 1 second
3. F01 with LWCO: reset the LWCO box first, then the display
4. F01 flue switch: push the red button on the switch (flue below 90 F)
5. PP: press RESET to start the control

Reset the maintenance reminder

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

Clear MAINTENANCE REQUIRED after service.

1. Hold ENTER 3 seconds (code stays 000)
2. Press ENTER again to reach SERVICE SCHEDULE RESET
3. Use the right arrow to pick Year or Hours
4. Press ENTER to reset, adjust with up/down, press ENTER

Remove a cascade (Cascade System Removal)

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

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.

Reset one parameter to its default

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

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.

Clear an ignition lockout

NTI · TRX150

Wake the display, then press RESET to remove the lockout so ignition can be tried again. Do not keep resetting without finding the cause.

1. Press any display button to wake the display.
2. Press RESET.
3. Watch the ignition trials and confirm the burner lights.

Clearing the low water cutoff lockout after filling

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

First-time fill or after the LWCO test.

1. Fill the boiler so the amber LOW WATER light goes out
2. Clear the lockout from the display board
3. The burner should then fire

Lockout reset limit

NTI · TRX150

The boiler allows five resets in 15 minutes. A sixth attempt in that window locks the boiler out until the electrical supply is disconnected and reconnected. Repeated lockouts can mean a serious fault with the boiler or installation.

1. Count resets. Five presses of Reset in 15 minutes is the limit.
2. After a lockout, disconnect and reconnect the electrical supply to restore operation.
3. If lockouts repeat, call a qualified service technician before the boiler is reset again.

Reset after a lockout

NTI · TRX150

The RESET button lights red when the boiler is in a lockout error. After RESET clears the condition, the button flashes for five seconds.

1. Find and correct the cause of the lockout first.
2. Press the RESET button.
3. Wait for the flashing to stop and confirm the boiler restarts normally.

Reset the SERVICE reminder (8000 h counter)

Rinnai · E50CRN; E75CRN; E75CRP; E110CRN; E110CRP

After 8000 burner hours the display scrolls SERVICE alternating with Good. The counter is reset from the SERV chapter.

1. Enter C123, press MODE until SERV
2. Hold STORE until SERV flashes once
3. The hour counter returns to 8000

Restore factory parameters (Copy)

Rinnai · E50CRN; E75CRN; E75CRP; E110CRN; E110CRP

All parameters of the current access level go back to factory values; the display shows Copy to confirm.

1. Enter C123 and go to the PARA chapter
2. Press STORE (the green button) while in PARA
3. Copy appears; the factory settings are now active

Venturi reset on the PC board (code 170)

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

Holding SW2 and SW3 together shows P, then PCL on a second hold.

1. Press SW2 and SW3 together until P appears.
2. Hold SW2 and SW3 together a second time until PCL appears.

Clear the service message (P.1 / P.8)

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

A service message you acknowledge without resetting comes back the next Monday. Reset it through parameter 1411.0.

1. Service menu > System configuration > Boiler
2. Set parameter 1411.0 Clear maintenance messages to ON
3. Set the next interval in 521.0 (burner hours) or 522.3 (months)