Navien Error Code Fan Target APS: Status Information item 18 – Fan Target APS (Boiler)

Updated October 16, 2026 · by Aurora Star Tech Inc.

Navien error code Fan Target APS on a boiler means: Status Information item 18 - Fan Target APS. It is also called Navien diagnostic code Fan Target APS.

Low severityBoilerNavien NHB-H

Homeowner? What Navien code Fan Target APS means for you

Usually minor Your boiler is reporting: Status Information item 18 - Fan Target APS. 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.

Call (647) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Navien error code Fan Target APS mean?

Commanded air pressure sensor (APS) voltage (V). Read-only item 18 in the Status Information menu.

Applies to: NHB-055H, NHB-080H, NHB-110H, NHB-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 Fan Target APS

NHB-055H NHB-080H NHB-110H NHB-150H

Other Navien Boiler codes

Code	Meaning
Elapsed Time After Install	EMS Data counter 1
EMS Data	EMS Data menu (history counters)
Error History	Error history list
Exhaust Temp	Status Information item 20 - Exhaust Temp
Fan Current APS	Status Information item 19 - Fan Current APS
Fan Current RPM	Status Information item 17 - Fan Current RPM
Fan Target RPM	Status Information item 16 - Fan Target RPM
Flame Loss - No. of Times	EMS Data counter 3
Flame Value	Status Information item 15 - Flame Value
Freeze Protection icon	Freeze protection mode active
Gas	Status Information item 26 - Gas
Gas Consumption	Service Status Info item 3 - Gas Consumption

All Navien Boiler error codes →

Navien code Fan Target APS: homeowner questions

What does Navien code Fan Target APS mean?

Status Information item 18 - Fan Target APS. Commanded air pressure sensor (APS) voltage (V). Read-only item 18 in the Status Information menu.

Is it safe to keep using my boiler with code Fan Target APS?

Usually yes. Code Fan Target APS is normally minor, but if it keeps coming back have it checked.

Can I reset Navien code Fan Target APS myself?

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

Who can fix Navien code Fan Target APS near me?

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

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Source: Navien NHB-H User's Information Manual (V1.0 Apr 2024), 3.3, p.13-14; Navien NHB-H Installation and Operation Manual, 11.7, p.103-104. 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.