NTI · Boiler

Hold 63 LCI off (limit control input)

Medium severity Trinity Tft

What the control is telling you

Control is showing the limit control input open.

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

Likely causes

Wrong control board fitted for this model

Test and repair steps

Replace the control with the correct model

Models that show this code

13 models in Trinity Tft

Tft110Tft154Tft155Tft175Tft200Tft201Tft250Tft285Tft300Tft340Tft399Tft60Tft85

Other codes on the same units

Hold 61 Anti short-cycle delay
Hold 62 Fan speed not proved
Hold 62 Fan speed not proved
Hold 63 LCI off (limit control input)
Hold 65 Interrupted air switch off
Hold 65 Interrupted air switch off
Hold 66 Interrupted air switch on
Hold 66 Interrupted air switch on

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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.