HVACopediaNTI · Boiler
Alert 84 Lead Lag CH 4-20mA water temperature setting was invalid
What the control is telling you
Lead Lag CH 4-20mA water temperature setting was invalid.
Applies to: Trinity Tft60, Tft85, Tft110, Tft154, Tft201, Tft285, Tft340, Tft399
Models that show this code
13 models in Trinity Tft
Other codes on the same units
- Alert 80 Fan pulses per revolution was invalid
- Alert 80 Fan pulses per revolution was invalid
- Alert 81 Fan PWM frequency was invalid
- Alert 81 Fan PWM frequency was invalid
- Alert 85 No Lead Lag add stage error threshold was configured
- Alert 86 No Lead Lag add stage detection time was configured
- Alert 87 No Lead Lag drop stage error threshold was configured
- Alert 88 No Lead Lag drop stage detection time was configured
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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.
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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.