HVACopediaNavien · Combi boiler
Outdoor reset icon Outdoor reset enabled
What the display is showing
Shown when the Outdoor Reset feature is enabled.
Applies to: NCB-190/060H to NCB-250/150H
Settings for these units
Minimum installation clearances (indoor) · Navien NCB-H
| Side | Minimum |
|---|---|
| Top | 9 in (229 mm) |
| Back | 0.5 in (13 mm) |
| Front | 4 in (100 mm) |
| Sides | 3 in (76 mm) |
| Bottom | 12 in (300 mm) |
Indoor wall-hung only; ambient must stay above 32°F (0°C).
Do not install on carpet; leave room for service.
Water quality limits (DHW and system fill) · Navien NCB-H
| Contaminant | Max allowed |
|---|---|
| Total hardness | 200 mg/l (12 grains/gallon) |
| Aluminum | 0.05 to 0.2 mg/l |
| Chloride | 250 mg/l |
| Copper | 1.0 mg/l |
| Iron | 0.3 mg/l |
| Manganese | 0.05 mg/l |
| pH | 6.5 to 8.5 |
| Sulfate | 250 mg/l (DHW table); 205 mg/l (fill table) |
| Total dissolved solids | 500 mg/l |
| Zinc | 5 mg/l |
| Chlorine (fill water) | 4 mg/l |
Scale damage from poor water is not covered by warranty.
Manual shows sulfate 250 mg/l on p.23 and 205 mg/l on p.29 - check local guidance.
Models that show this code
5 models in Navien NCB-H
Other codes on the same units
- Operation State Status Information item 1 - Operation State
- Outdoor Reset Status Information item 25 - Outdoor Reset
- Outdoor Reset Curve Status Information item 26 - Outdoor Reset Curve
- Outdoor Temp Status Information item 13 - Outdoor Temp
- Outdoor temperature Outdoor temperature display
- Outlet Temp Status Information item 11 - Outlet Temp
- Panel F/W Ver Status Information item 33 - Panel F/W Ver
- Return Temp Status Information item 7 - Return Temp
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Source: Navien NCB-H User's Information Manual (V1.0 Apr 2024), 2.3.1 Icons and Digital Display, p.8. Summarized in our own words; check the original manual for your model.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.