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NTI · Boiler troubleshooting

Blower not running

Trinity Tft

What is going on

No blower operation on a call for heat.

Likely causes

  • 5-position signal connector or 3-position power connector loose
  • Blown fuse A
  • Failed blower

Check in this order

  1. Verify the 3-position power Molex and the 5-position signal Molex are seated on the blower
  2. Check fuse A (it also feeds the spark generator and PUMP B)
  3. Measure voltage across pins 1 and 2 (black and white) of the 3-position connector; with 120 VAC present, pull the 5-position signal plug and the blower should spin at high speed - replace the blower if it does not

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

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

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.