Fault code3004
BYPASS COIL OPEN indicates the M2 contactor will not close when commanded due to loose wires or bad output on RBCU. The manual's first action is: “Verify that J8 connector is firmly seated.”
- Model
- ABB ACH550
- Display shows
- BYPASS COIL OPEN (3004)
- Type
- Fault code
- Source
- Manual p. 67
What 3004 means
BYPASS COIL OPEN p. 67
Common causes
- M2 contactor will not close when commanded to do so p. 67
- Loose wires on contactor terminals A1 and/or A2 p. 67
- Bad Output on RBCU p. 67
- Bad Contactor p. 67
What to do
- Verify that J8 connector is firmly seated. p. 67
- With incoming power disconnected, check for tightness of A1 and A2 terminals p. 67
- Swap RBCU p. 67
- Change Contactor/Assembly p. 67
Before you service the product, read the safety instructions in the manual p. 2.
If 3004 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 3004; 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.