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NTI Error Code NOAVL: PCB error: boiler application not set (Boiler)

Updated · by Aurora Star Tech Inc.

NTI error code NOAVL on a boiler means: PCB error: boiler application not set. It is also called NTI diagnostic code NOAVL.

Medium severityBoilerTRX

Homeowner? What NTI code NOAVL means for you

Check, then call Your boiler is reporting: PCB error: boiler application not set. This is often caused by something simple. Try the safe checks below; if the code returns, book a service call before it turns into a no-heat or no-hot-water emergency.

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) 657-2977Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does NTI error code NOAVL mean?

Parameter 046 is set to UNDEF. Clears once the issue is corrected.

Applies to: TRX150

Common causes of NTI code NOAVL

  • Parameter 046 left at UNDEF
  • Short on the eBus2 wires
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.

NTI models that use code NOAVL

TRX085TRX110CTRX150TRX199TRX199C

Other NTI Boiler codes

CodeMeaning
Lockout 261Neighbor burner control blower fault detected
Lockout 262Blower fault detected during flap test
Lockout 263Invalid DHW demand temperature setting
Lockout 264Invalid preferred outlet high limit setting
Lockout 265Invalid preferred lightoff rate setting
Lockout 266Invalid preferred stack limit rate setting

All NTI Boiler error codes →

NTI code NOAVL: homeowner questions

What does NTI code NOAVL mean?

PCB error: boiler application not set. Parameter 046 is set to UNDEF. Clears once the issue is corrected.

Is it safe to keep using my boiler with code NOAVL?

It depends on the cause. This is often caused by something simple. Try the safe checks below; if the code returns, book a service call before it turns into a no-heat or no-hot-water emergency.

Can I reset NTI code NOAVL myself?

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

Who can fix NTI code NOAVL near me?

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

Homeowner help: Boiler Not Heating: What to Check

Troubleshooting guides

Source: NTI TRX150 manual, p. 87. 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.

© 2026 Aurora Star Tech Inc. All rights reserved. This page may not be copied, republished or used to train other systems without written permission.

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