Can I reset my NTI boiler to clear the Inlet Sensor Fault code?

You can reset once if your manual says it's safe. If the code returns, stop resetting — repeated resets on a genuine fault, especially gas or overheat faults, can be unsafe and may worsen the problem. Book a licensed repair instead.

Is the Inlet Sensor Fault fault dangerous?

It's not usually an immediate safety emergency, but it should be diagnosed to prevent further damage and restore reliable operation.

How much does it cost to fix a NTI Inlet Sensor Fault fault?

Cost depends on the underlying cause — some causes (like low pressure or a dirty sensor) are minor, while others (like a gas valve or control board) cost more. We diagnose first and give you a clear price before any repair.

NTI Error Code

NTI Error Code Inlet Sensor Fault

The return (inlet) temperature sensor reads open or short circuit.

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If your NTI combi boiler is showing error code Inlet Sensor Fault, here's what it means: The return (inlet) temperature sensor reads open or short circuit. This is a moderate fault. The boiler may keep running intermittently, but it should be diagnosed soon to prevent further damage.

NTI boilers report faults using fault lockouts and sensor messages on the trinity tft / tx display. Knowing the code helps a technician arrive prepared with the right parts, which usually means a faster, lower-cost repair.

What causes the Inlet Sensor Fault code?

Error Inlet Sensor Fault on a NTI boiler is most commonly caused by one of the following:

Faulty return sensor
Damaged or loose wiring
Control board fault

What you can safely check first

Note the exact code and your boiler's model number
Check the pressure gauge — low pressure triggers many faults
Confirm the gas supply is on and other gas appliances work
Reset the boiler once, per the manual, only if it's safe to do so
If the code returns, stop and call a licensed technician

Why this needs a licensed technician

Resolving a Inlet Sensor Fault fault almost always involves the gas, combustion, sensor or pressurized side of the appliance. Under BC's Safety Standards Act, that work must be performed by a licensed gas fitter — and doing it correctly protects your warranty and your safety. We diagnose NTI boilers, carry common parts, and verify clean combustion before returning your boiler to service.

This is not a DIY repair

Combi boilers are gas-fired appliances regulated under the BC Safety Standards Act. Opening the unit, touching the gas valve, or working on the flue without a valid BC gas-fitter licence is both unsafe and illegal. Diagnosing the fault is helpful — fixing it should always be left to a certified technician.

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Frequently Asked Questions

Other NTI codes & help

NTI Ignition LockoutThe boiler attempted to light but no flame was proven aft…NTI Flame LossThe burner lit but the flame was lost during operation.NTI High Limit LockoutWater temperature exceeded the safe high-limit, so the bo…NTI Low Water PressureSystem pressure dropped below the minimum needed to run s…NTI Outlet Sensor FaultThe supply (outlet) temperature sensor reads open or shor…All NTI Error CodesFull list

Fix Your NTI Inlet Sensor Fault Fault

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