The M1 contactor is stuck and unable to move during power-up or after being commanded to open, indicating a potential mechanical or electronic fault. The manual's first action is: “Disconnect incoming power from unit. Check if contactor armature moves freely. If armature moves freely, then change the RBCU. If armature does not move freely, then change individual contactor (M1) or the complete assembly (RCSA-0x)”
- Model
- ABB ACH550
- Display shows
- DRV CNTACT STUCK (3003)
- Type
- Fault code
- Source
- Manual p. 66
What 3003 means
DRV CNTACT STUCK p. 66
Common causes
- M1 contactor indicates it is not prepared to move on a power up check of the contactor or after contact is commanded to open p. 66
What to do
- Disconnect incoming power from unit. Check if contactor armature moves freely. If armature moves freely, then change the RBCU. If armature does not move freely, then change individual contactor (M1) or the complete assembly (RCSA-0x) p. 66
Before you service the product, read the safety instructions in the manual p. 2.
If 3003 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 3003; 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.