Fault code3028
EXT COMM LOSS indicates communication issues due to incorrect settings, poor connections, or noise on the line. The manual's first action is: “Check Group 51 & 53 Tighten Connections Check Communication Cable Grounding”
- Model
- ABB ACH550
- Display shows
- EXT COMM LOSS (3028)
- Type
- Fault code
- Source
- Manual p. 70
What 3028 means
EXT COMM LOSS p. 70
Common causes
- Incorrect Communication settings in Group 51 & 53. p. 70
- Poor Connections p. 70
- Noise on Communication Line p. 70
What to do
- Check Group 51 & 53 Tighten Connections Check Communication Cable Grounding p. 70
Before you service the product, read the safety instructions in the manual p. 2.
If 3028 is still not resolved
- contact the factory or your local Authorized Service Center for repair or replacement. p. 2 “Never attempt to repair a malfunctioning ACH550; contact the factory or your local Authorized Service Center for repair or replacement.”
This page summarises what the manufacturer’s manual says about 3028; 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 ABB. Found a mistake? Report an error.