Daikin EWAD Fault Code A9
Daikin EWAD Fault Code A9 is a warning alarm indicating: Compressor motor temperature sensor fault. The most common causes include Motor winding temperature sensor failure. Estimated repair time: 30-60 minutes (requires sensor replacement and calibration verification). This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Compressor motor temperature sensor fault
Brand: Daikin | Model: EWAD (Screw Compressor Chiller) | Code: A9 | Severity: Warning
Observable Symptoms
- Temperature reading on controller display shows abnormal value or dashes
- Chiller may not start or cycles erratically due to incorrect temperature input
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Motor winding temperature sensor failure
- Sensor wiring damaged
- Sensor reading out of range
Recommended Inspection Steps
- Identify which motor temp sensor is faulting
- Measure sensor resistance
- Check wiring continuity
- Replace sensor if faulty
Required Tools & Equipment
- Digital multimeter
- Infrared thermometer or calibrated temperature probe
- Safety PPE (gloves, safety glasses, face shield)
- Wire tracing and continuity tester
Estimated Repair Time
30-60 minutes (requires sensor replacement and calibration verification)
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 A9 mean?
Fault code A9 on a Daikin EWAD chiller indicates: Compressor motor temperature sensor fault. This is a warning alarm that requires diagnostic attention.
What causes Daikin EWAD alarm code A9?
Common causes include: Motor winding temperature sensor failure; Sensor wiring damaged; Sensor reading out of range
How do I fix Daikin EWAD error code A9?
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.