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NTI Error Code 01 07: Insufficient circulation or water (Boiler)

Updated · by Aurora Star Tech Inc.

NTI error code 01 07 on a boiler means: Insufficient circulation or water. It is also called NTI diagnostic code 01 07.

High severityBoilerTRX

Homeowner? What NTI code 01 07 means for you

Call a technician Your boiler is reporting: Insufficient circulation or water. The boiler has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.

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 01 07 mean?

Return minus supply temperature above 63 °F.

Applies to: TRX150

Common causes of NTI code 01 07

  • Low water pressure
  • Air in the CH circuit
  • Faulty temperature probe or pump
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 01 07

TRX085TRX110CTRX150TRX199TRX199C

Other NTI Boiler codes

CodeMeaning
01 01Overheat (CH circuit)
01 03Insufficient circulation or low water pressure
01 04Insufficient circulation or low water pressure
01 05Insufficient circulation or low water pressure
01 06Insufficient circulation or low water pressure
01 08Low water pressure lockout (water pressure switch)
1 10CH flow temperature probe open or short circuit
1 12CH return temperature probe open or short circuit
1 14External (outdoor) sensor open or short circuit
1 16Floor thermostat contact open
1 P1Insufficient circulation or missing water (warning)
1 P2Insufficient circulation or missing water (warning)

All NTI Boiler error codes →

NTI code 01 07: homeowner questions

What does NTI code 01 07 mean?

Insufficient circulation or water. Return minus supply temperature above 63 °F.

Is it safe to keep using my boiler with code 01 07?

It depends on the cause. The boiler has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.

Can I reset NTI code 01 07 myself?

You can try one reset (power off for 30 seconds, then on). If NTI code 01 07 comes back, the cause is still there and a licensed technician should check it.

Who can fix NTI code 01 07 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. 90. 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.

Emergency Boiler Repair

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