HVACopediaNTI · Boiler
Lockout 17 Internal fault: Safety relay test failed due to safety relay not OFF
What the control is telling you
Control board self-check reported an internal problem: Safety relay test failed due to safety relay not OFF.
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
- Lockout 165 Block intake OFF
- Lockout 165 Block intake OFF
- Lockout 169 Safety opto bad in test state
- Lockout 17 Internal fault: Safety relay test failed due to safety relay not OFF
- Lockout 170 Safety relay opto feedback incorrect
- Lockout 171 Safety relay feedback incorrect in run
- Lockout 172 Main relay feedback incorrect
- Lockout 172 Main relay feedback incorrect
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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.
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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.