NTI · Boiler

Hold / Lockout 105 Flame detected out of sequence

High severity Trinity Tft

What the control is telling you

Flame detected out of sequence.

Applies to: Trinity Tft60, Tft85, Tft110, Tft154, Tft201, Tft285, Tft340, Tft399

Models that show this code

13 models in Trinity Tft

Tft110Tft154Tft155Tft175Tft200Tft201Tft250Tft285Tft300Tft340Tft399Tft60Tft85

Other codes on the same units

Alert 98 CH max modulation rate was invalid, % vs. RPM
Alert 99 CH max modulation rate was > absolute max rate
Alert 99 CH max modulation rate was > absolute max rate
Hold / Lockout 105 Flame detected out of sequence
Hold / Lockout 128 Fan speed failed during pre-purge
Hold / Lockout 128 Fan speed failed during pre-purge
Hold / Lockout 129 Fan speed failed during pre-ignition
Hold / Lockout 129 Fan speed failed during pre-ignition

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Source: NTI Trinity Tft399 Installation and Operation Manual (2018-09-07), Sec. 16.0 Troubleshooting, Table 16-3. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.