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NTI · Boiler troubleshooting

Blower runs at high speed with burner off

Trinity Tft

What is going on

Blower will not idle down in standby.

Likely causes

  • Blower signal cable disconnected
  • No 24 VAC to the control

Check in this order

  1. Check the 5-position Molex on the blower and the 4-position Molex on the control
  2. Check the control power LED and fuse C
  3. Measure 24 VAC at J8 pins 1 and 2

Applies to: Trinity Tft60, Tft85, Tft110, Tft155, Tft175, Tft200, Tft250, Tft300, Tft399

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Source: NTI Tft60-399 Installation and Operation Instructions (rev. 2012-04-09), Sec. 15.0 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.