Daikin EWAD Fault Code A3
Daikin EWAD Fault Code A3 is a warning alarm indicating: Inverter compressor overheating. The most common causes include Inverter heatsink temperature too high. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Inverter compressor overheating
Brand: Daikin | Model: EWAD (Screw Compressor Chiller) | Code: A3 | 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
- Inverter heatsink temperature too high
- Cooling fan for inverter failed
- Ambient temperature too high
Recommended Inspection Steps
- Check inverter heatsink temperature
- Verify inverter cooling fan operation
- Improve enclosure ventilation
- Reduce compressor load if inverter overheating
Required Tools & Equipment
- Infrared thermometer or calibrated temperature probe
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
1-2 hours
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 A3 mean?
Fault code A3 on a Daikin EWAD chiller indicates: Inverter compressor overheating. This is a warning alarm that requires diagnostic attention.
What causes Daikin EWAD alarm code A3?
Common causes include: Inverter heatsink temperature too high; Cooling fan for inverter failed; Ambient temperature too high
How do I fix Daikin EWAD error code A3?
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.