Daikin EWAD Fault Code A4
Daikin EWAD Fault Code A4 is a warning alarm indicating: Inverter compressor current imbalance. The most common causes include Compressor motor winding imbalance. Estimated repair time: 4-8 hours (requires refrigerant recovery, compressor changeout, evacuation, and recharge). This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Inverter compressor current imbalance
Brand: Daikin | Model: EWAD (Screw Compressor Chiller) | Code: A4 | Severity: Warning
Observable Symptoms
- Controller displays alarm code and description
- Chiller may be locked out or running in degraded mode
- Alarm indicator light is illuminated on control panel
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Compressor motor winding imbalance
- Inverter output phase imbalance
- Motor connection fault
Recommended Inspection Steps
- Measure motor winding resistance on all phases
- Check inverter output voltage balance
- Inspect motor connections
- Replace compressor if winding imbalance
Required Tools & Equipment
- Clamp-on ammeter
- Digital multimeter
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
4-8 hours (requires refrigerant recovery, compressor changeout, evacuation, and recharge)
When to Call a Professional
- If the fault persists after completing all recommended inspection steps
- If you observe unusual noises, vibrations, or oil leaks from the compressor
- If refrigerant charge levels are outside OEM specifications and EPA-certified recovery is needed
- If electrical measurements show voltage imbalance greater than 2% between phases
- If the fault recurs immediately after reset, indicating an unresolved safety condition
- Contact an authorized Daikin service representative for warranty-covered repairs
Related Fault Codes
Other Daikin EWAD codes that may be related:
OEM Service Manual Reference
OEM Reference: Daikin EWAD Air-Cooled Screw Chiller Service Manual. Available through Daikin Applied technical support.
Frequently Asked Questions
What does Daikin EWAD fault code A4 mean?
Fault code A4 on a Daikin EWAD chiller indicates: Inverter compressor current imbalance. This is a warning alarm that requires diagnostic attention.
What causes Daikin EWAD alarm code A4?
Common causes include: Compressor motor winding imbalance; Inverter output phase imbalance; Motor connection fault
How do I fix Daikin EWAD error code A4?
Follow the recommended inspection steps below. Start with the quick check, then proceed through each step. If the fault persists after all steps, contact an authorized Daikin service representative.