72 · FC 301/302 · ALARM
For 72 · FC 301/302 · ALARM, brand is Danfoss; model / series is FC 301/302; fault code is 72; fault name is Dangerous failure; type is ALARM, verified against its source on 2026-09-01.
- Brand
- Danfoss
- Model / series
- FC 301/302
- Fault code
- 72 verified
- Fault name
- Dangerous failure verified
- Type
- ALARM verified
- Cause
- STO with trip lock. An unexpected combination of STO commands has occurred: • VLT® PTC Thermistor Card MCB 112 enables X44/10, but STO is not enabled. • MCB 112 is the only device using STO (specified through selection [4] PTC 1 alarm or [5] PTC 1 warning in parameter 5-19 Terminal 37 Safe Stop), STO is activated, and X44/10 is not activated. verified
What the source says
ALARM 72, Dangerous failure
— files.danfoss.com, retrieved 2026-09-01
Where each value comes from
The value above is stated away from the sentence quoted with the answer, so the passage that states it is shown here too.
Cause
STO with trip lock. An unexpected combination of STO commands has occurred: • VLT® PTC Thermistor Card MCB 112 enables X44/10, but STO is not enabled. • MCB 112 is the only device using STO (specified through selection [4] PTC 1 alarm or [5] PTC 1 warning in parameter 5-19 Terminal 37 Safe Stop), STO is activated, and X44/10 is not activated.
— all from files.danfoss.com, retrieved 2026-09-01
Source
- files.danfoss.comhttps://files.danfoss.com/download/Drives/MG33MO22.pdf