HVACopediaNTI · Boiler
Hold 137 ILK failed to close
What the control is telling you
Interlock string did not close when the control called for burner start.
Applies to: Trinity Tft60, Tft85, Tft110, Tft154, Tft201, Tft285, Tft340, Tft399
Likely causes
- Same causes as Hold / Lockout 67
Test and repair steps
- Follow the Hold / Lockout 67 checks
Models that show this code
13 models in Trinity Tft
Other codes on the same units
- Hold 132 Fan speed failed during run
- Hold 136 Interrupted Airflow Switch failed to close
- Hold 136 Interrupted Airflow Switch failed to close
- Hold 137 ILK failed to close
- Hold 150 Flame not detected
- Hold 150 Flame not detected
- Hold 20 Internal fault: Flame ripple and overflow
- Hold 20 Internal fault: Flame ripple and overflow
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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.