HVACopediaNTI · Boiler
Hold / Lockout 155 Purge fan switch OFF
What the control is telling you
Purge fan switch 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
- Hold / Lockout 153 Combustion pressure OFF
- Hold / Lockout 154 Purge fan switch ON
- Hold / Lockout 154 Purge fan switch ON
- Hold / Lockout 155 Purge fan switch OFF
- Hold / Lockout 156 Combustion pressure and Flame ON
- Hold / Lockout 156 Combustion pressure and Flame ON
- Hold / Lockout 240 Invalid Outdoor connector type setting
- Hold / Lockout 243 Invalid UV with spark interference not compatible with Igniter on throughout
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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.