Daikin EWAD Fault Code E4
Daikin EWAD Fault Code E4 is a warning alarm indicating: Compressor discharge temperature abnormal. The most common causes include Discharge temperature too high from compression ratio. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Compressor discharge temperature abnormal
Brand: Daikin | Model: EWAD (Screw Compressor Chiller) | Code: E4 | Severity: Warning
Observable Symptoms
- Discharge temperature gauge reads above 250F (121C)
- Discharge line may be hot enough to cause burns on contact
- Compressor oil may appear dark or burnt
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Discharge temperature too high from compression ratio
- Compressor oil level low
- Condenser not rejecting heat properly
Recommended Inspection Steps
- Measure discharge temperature with calibrated probe
- Check compressor oil level
- Verify condenser operation and airflow
- Check refrigerant subcooling
- Compressor may need internal inspection
Required Tools & Equipment
- Infrared thermometer or calibrated temperature probe
- Oil level sight glass inspection tool
- PT chart for refrigerant type
- 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 E4 mean?
Fault code E4 on a Daikin EWAD chiller indicates: Compressor discharge temperature abnormal. This is a warning alarm that requires diagnostic attention.
What causes Daikin EWAD alarm code E4?
Common causes include: Discharge temperature too high from compression ratio; Compressor oil level low; Condenser not rejecting heat properly
How do I fix Daikin EWAD error code E4?
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.