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NTI Error Code 1 16: Floor thermostat contact open (Boiler)

Updated · by Aurora Star Tech Inc.

NTI error code 1 16 on a boiler means: Floor thermostat contact open. It is also called NTI diagnostic code 1 16.

Medium severityBoilerTRX

Homeowner? What NTI code 1 16 means for you

Check, then call Your boiler is reporting: Floor thermostat contact open. 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 1 16 mean?

The floor safety thermostat contact is open. Auto reset.

Applies to: TRX150

Common causes of NTI code 1 16

  • Parameter 223 set to 0 with no floor thermostat fitted
  • Floor thermostat tripped because the CH setpoint is too high
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 1 16

TRX085TRX110CTRX150TRX199TRX199C

Other NTI Boiler codes

CodeMeaning
01 06Insufficient circulation or low water pressure
01 07Insufficient circulation or water
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 P1Insufficient circulation or missing water (warning)
1 P2Insufficient circulation or missing water (warning)
1 P3Inadequate circulation or missing water (warning)
02 01Damaged or shorted DHW temperature probe
02 03Storage temperature probe open or short circuit
02 05DHW inlet probe open circuit

All NTI Boiler error codes →

NTI code 1 16: homeowner questions

What does NTI code 1 16 mean?

Floor thermostat contact open. The floor safety thermostat contact is open. Auto reset.

Is it safe to keep using my boiler with code 1 16?

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 1 16 myself?

You can try one reset (power off for 30 seconds, then on). If NTI code 1 16 comes back, the cause is still there and a licensed technician should check it.

Who can fix NTI code 1 16 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.

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