Daikin EWAD Fault Code E2
Daikin EWAD Fault Code E2 is a warning alarm indicating: Outdoor coil temperature sensor fault. The most common causes include Sensor element 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
Outdoor coil temperature sensor fault
Brand: Daikin | Model: EWAD (Screw Compressor Chiller) | Code: E2 | 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
- Oil sight glass shows low level or empty
- Compressor may make unusual noise from lack of lubrication
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Sensor element failure
- Sensor wiring open or shorted
- Connector corrosion or loose contact
Recommended Inspection Steps
- Measure sensor resistance at current temperature
- Check wiring continuity
- Inspect connector pins
- Replace sensor if out of specification
Required Tools & Equipment
- Clamp-on ammeter
- Coil cleaning brush and coil cleaner
- Digital multimeter
- Infrared thermometer or calibrated temperature probe
- Oil level sight glass inspection tool
- 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 E2 mean?
Fault code E2 on a Daikin EWAD chiller indicates: Outdoor coil temperature sensor fault. This is a warning alarm that requires diagnostic attention.
What causes Daikin EWAD alarm code E2?
Common causes include: Sensor element failure; Sensor wiring open or shorted; Connector corrosion or loose contact
How do I fix Daikin EWAD error code E2?
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.