Thermistor Input 1 Fault occurs when motor temperature increased, requiring checking cooling, load, or thermistor connection. The manual's first action is: “Check the motor cooling and the load. Check the thermistor connection. If the thermistor input is not used, you have to short-circuit it. Ask for instructions from your nearest distributor.”
- Model
- Danfoss 100 FLOW
- Display shows
- Thermistor Input 1 Fault (66)
- Type
- Fault code
- Source
- Manual p. 312
What 66 means
Thermistor Input 1 Fault p. 312
Common causes
- The motor temperature increased. p. 312
What to do
- Check the motor cooling and the load. Check the thermistor connection. If the thermistor input is not used, you have to short-circuit it. Ask for instructions from your nearest distributor. p. 312
If 66 is still not resolved
The manual gives no further instruction for this code. Open the code table in the PDF or contact Danfoss service.
This page summarises what the manufacturer’s manual says about 66; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Danfoss. Found a mistake? Report an error.