NTI · Boiler

Alert 101 DHW max modulation rate was invalid, % vs. RPM

Low severity Trinity Tft

What the control is telling you

DHW max modulation rate was invalid, % vs. RPM.

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 10 Configuration was restored from factory defaults
  • Alert 100 CH modulation range (max minus min) was too small (< 4% or 40 RPM)
  • Alert 100 CH modulation range (max minus min) was too small (< 4% or 40 RPM)
  • Alert 101 DHW max modulation rate was invalid, % vs. RPM
  • Alert 102 DHW max modulation rate was > absolute max rate
  • Alert 102 DHW max modulation rate was > absolute max rate
  • Alert 103 DHW modulation range (max minus min) was too small (< 4% or 40 RPM)
  • Alert 103 DHW modulation range (max minus min) was too small (< 4% or 40 RPM)

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Source: NTI Trinity Tft399 Installation and Operation Manual (2018-09-07), Sec. 16.0 Troubleshooting, Table 16-4. 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.