HVACopediaNavien · Boiler
SH3 Thermostat Status Input/Output Status item 3 - SH3 Thermostat Status
What the display is showing
Service menu 2. Input/Output Status, item 3: shows the state of the space heating thermostat 3 input. Useful to see whether the control is seeing or sending a signal.
Applies to: NHB-055H, NHB-080H, NHB-110H, NHB-150H
What to do
- Hold Back + Menu 3 s > 2. Input/Output Status > pick the item.
Settings for these units
Installation clearances (indoor) · Navien NHB-H
| Side | Minimum clearance |
|---|---|
| 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) |
| Vent to combustibles | 0 in |
Bracket gives 5/8 in (16 mm) from the wall; studs at 16 in on centre.
Common vent installs: 36 in above the top and 24 in in front are recommended for service.
Models that show this code
4 models in Navien NHB-H
Other codes on the same units
- E786 Improper front panel detected
- E788 Incorrect gas type setting
- SH1 Thermostat Status Input/Output Status item 1 - SH1 Thermostat Status
- SH2 Thermostat Status Input/Output Status item 2 - SH2 Thermostat Status
- Zone2 Pump Status Input/Output Status item 7 - Zone2 Pump Status
- AHU SH Set Temp Status Information item 5 - AHU SH Set Temp
- AHU connection icon Air handler connection
- Air Handler Interface Output Status Input/Output Status item 15 - Air Handler Interface Output Status
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Source: Navien NHB-H Installation and Operation Manual, 11.13.2 Viewing Input and Output Status, p.110-111. 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.