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NTI Boiler: Overheat cutoff and lockout at 212°F

Updated · by Aurora Star Tech Inc.

Overheat cutoff and lockout at 212°F on a NTI boiler: The temperature controls are UL 353 listed. They shut off the fuel when the set point is reached. At 212°F, the boiler goes into safety shutdown and lockout and needs a manual reset.

Homeowner with a boiler problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: TRX boilers

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.

If the unit shows an error code, look it up: NTI Boiler codes

Models

TRX085TRX110CTRX150TRX199TRX199C

More other tips for boiler

Source: NTI TRX150 manual, p. 10. 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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