24 · FC 301/302 · WARNING
For 24 · FC 301/302 · WARNING, brand is Danfoss; model / series is FC 301/302; fault code is 24; fault name is External fan fault; type is WARNING, verified against its source on 2026-09-01.
- Brand
- Danfoss
- Model / series
- FC 301/302
- Fault code
- 24 verified
- Fault name
- External fan fault verified
- Type
- WARNING verified
- Cause
- The fan warning function is a protective function that checks if the fan is running/mounted. The fan warning can be disabled in parameter 14-53 Fan Monitor ([0] Disabled). For frequency converters with DC fans, a feedback sensor is mounted in the fan. If the fan is commanded to run and there is no feedback from the sensor, this alarm appears. For frequency converters with AC fans, the voltage to the fan is monitored. verified
- Corrective action
- • Check for proper fan operation. • Cycle power to the frequency converter and check that the fan operates briefly at start-up. • Check the sensors on the heat sink. verified
What the source says
WARNING 24, External fan fault
— files.danfoss.com, retrieved 2026-09-01
Where each value comes from
This source states these in separate places, so each value is shown with the passage that states it.
Cause
The fan warning function is a protective function that checks if the fan is running/mounted. The fan warning can be disabled in parameter 14-53 Fan Monitor ([0] Disabled). For frequency converters with DC fans, a feedback sensor is mounted in the fan. If the fan is commanded to run and there is no feedback from the sensor, this alarm appears. For frequency converters with AC fans, the voltage to the fan is monitored.
Corrective action
• Check for proper fan operation. • Cycle power to the frequency converter and check that the fan operates briefly at start-up. • Check the sensors on the heat sink.
— all from files.danfoss.com, retrieved 2026-09-01
Source
- files.danfoss.comhttps://files.danfoss.com/download/Drives/MG33MO22.pdf