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Navien Error Code Inlet Temp: Status Information item 12 – Inlet Temp (Combi Boiler)

Updated · by Aurora Star Tech Inc.

Navien error code Inlet Temp on a combi boiler means: Status Information item 12 - Inlet Temp. It is also called Navien diagnostic code Inlet Temp.

Low severityCombi BoilerNavien NCB-H

Homeowner? What Navien code Inlet Temp means for you

Usually minor Your combi boiler is reporting: Status Information item 12 - Inlet Temp. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.

Safe things you can check yourself

  • Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
  • Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
  • Look at the pressure gauge on the boiler. If it reads much lower than usual or near zero, or water is leaking, call a technician.
  • Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
  • Check that the boiler gas valve is open (handle in line with the pipe).
  • Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
  • If only hot water is missing, check that the hot water tap is open far enough to start the heater.

Call (647) 657-2977Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Navien error code Inlet Temp mean?

Inlet temperature (F). Read-only item 12 in the Status Information menu.

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

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Navien models that use code Inlet Temp

NCB-190/060HNCB-190/080HNCB-240/110HNCB-240/130HNCB-250/150H

Other Navien Combi Boiler codes

CodeMeaning
Fan Target RPMStatus Information item 18 - Fan Target RPM
Flame ValueStatus Information item 17 - Flame Value
Flow Control ValveStatus Information item 22 - Flow Control Valve
GasStatus Information item 31 - Gas
Heat CapacityStatus Information item 2 - Heat Capacity
High AltitudeStatus Information item 28 - High Altitude
Main F/W VerStatus Information item 32 - Main F/W Ver
Mixing ValveStatus Information item 23 - Mixing Valve
ModelStatus Information item 30 - Model
Operation StateStatus Information item 1 - Operation State
Outdoor ResetStatus Information item 25 - Outdoor Reset
Outdoor Reset CurveStatus Information item 26 - Outdoor Reset Curve

All Navien Combi Boiler error codes →

Navien code Inlet Temp: homeowner questions

What does Navien code Inlet Temp mean?

Status Information item 12 - Inlet Temp. Inlet temperature (F). Read-only item 12 in the Status Information menu.

Is it safe to keep using my combi boiler with code Inlet Temp?

Usually yes. Code Inlet Temp is normally minor, but if it keeps coming back have it checked.

Can I reset Navien code Inlet Temp myself?

You can try one reset (power off for 30 seconds, then on). If Navien code Inlet Temp comes back, the cause is still there and a licensed technician should check it.

Who can fix Navien code Inlet Temp near me?

Aurora Star Tech Inc. repairs Navien combi boilers in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Homeowner help: Tankless Water Heater No Hot Water: What to Check · Boiler Not Heating: What to Check

Troubleshooting guides

Source: Navien NCB-H User's Information Manual (V1.0 Apr 2024), 3.3 Accessing Basic Menu Items, p.12-13. Written in our own words as a summary; always check the original manual.

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.

Emergency HVAC Service

647-657-2977