HVACopediaNTI · Boiler
Lockout 122 Light-off rate proving failed
What the control is telling you
Blower did not hit the light-off speed the control asked for.
Applies to: Trinity Tft60, Tft85, Tft110, Tft154, Tft201, Tft285, Tft340, Tft399
Likely causes
- Blower not turning on
- Missing or wrong blower feedback signal
- Blower running all the time
Test and repair steps
- Work through the blower not operating checks
- See Hold 62 for the feedback signal checks
- Work through the blower running at high speed with burner off checks
Models that show this code
13 models in Trinity Tft
Other codes on the same units
- Lockout 112 Pilot test flame timeout
- Lockout 113 Flame circuit timeout
- Lockout 113 Flame circuit timeout
- Lockout 122 Light off rate proving failed
- Lockout 123 Purge rate proving failed
- Lockout 123 Purge rate proving failed
- Lockout 138 Flame too low
- Lockout 143 Internal fault: Flame bias out of range 1
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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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