HVACopediaNTI · Boiler
Alert 478 Internal error: Safety key bit 0 was incorrect
What the control is telling you
Control board logged an internal error: Safety key bit 0 was incorrect.
Applies to: Trinity Tft60, Tft85, Tft110, Tft155, Tft175, Tft200, Tft250, Tft300, Tft399
Models that show this code
13 models in Trinity Tft
Other codes on the same units
- Alert 474 Internal error: PM safety parameter address was invalid
- Alert 475 Internal error: Invalid record in lockout history was removed
- Alert 476 Internal error: EEPROM write buffer was full
- Alert 477 Internal error: Data too large was not written to EEPROM
- Alert 479 Internal error: Safety key bit 1 was incorrect
- Alert 48 Write large enumerated Modbus register value was not allowed
- Alert 48 Write large enumerated Modbus register value was not allowed
- Alert 480 Internal error: Safety key bit 2 was incorrect
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Source: NTI Tft60-399 Installation and Operation Instructions (rev. 2012-04-09), Sec. 15.0 Troubleshooting, Table 15-4. 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.