NTI Boiler Error Codes
A plain-English reference to 9 common NTI fault codes — what each means, what causes it, and when to call a licensed BC gas technician.
NTI condensing boilers (TFTN, FTVN and TRX) show lockout and hold conditions on the control display. NTI is Canadian-built in Saint John, New Brunswick, engineered for cold-climate heating — but when a fault appears, the condition narrows the cause quickly. This reference explains the common NTI fault conditions, what each means and why ignition, flame, overheat and gas faults need a licensed BC gas technician rather than repeated resets.
Smell gas? Leave the building immediately and call 911 or FortisBC at 1-800-663-9911 from outside. Never bypass a safety lockout or attempt gas work yourself — in BC it must be done by a licensed gas fitter.
Ignition fault
Flame failure
System water-pressure fault
Over-temperature / high-limit
Condensate fault
Air-pressure / venting fault
Combustion-fan fault
Temperature-sensor fault
Water-flow / circulation fault
NTI error codes — FAQ
Why is my NTI boiler showing an error code?
NTI boilers display a fault code when a safety circuit detects a problem — for example with ignition, flame, water flow, temperature or venting. The code points to the affected system. The boiler shuts down to protect itself; a licensed technician then diagnoses the true root cause before repair.
Can I just reset my NTI boiler?
A single reset after a one-off event is usually fine, but repeated resets without fixing the cause can be unsafe — especially for ignition, gas and venting faults — and can cause further damage. If the code returns, switch the boiler off and call GasBoilers.ca at 604-359-1081.
Do you repair all NTI boiler models in Greater Vancouver?
Yes. Our Red Seal–certified, gas-licensed technicians service NTI TFTN (Trinity Fire Tube), FTVN and TRX condensing boilers across Vancouver, Burnaby, Surrey, Richmond, the Tri-Cities and the rest of Greater Vancouver. Same-day appointments are often available.
Error codes by brand
Get your NTI boiler back up and running
Licensed, Red Seal–certified gas technicians across Greater Vancouver. Upfront pricing, same-day service available.