Daikin EWAD Fault Code U2
Daikin EWAD Fault Code U2 is a warning alarm indicating: Power voltage abnormality. The most common causes include Power supply voltage too high or too low. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Power voltage abnormality
Brand: Daikin | Model: EWAD (Screw Compressor Chiller) | Code: U2 | 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
- Power supply voltage too high or too low
- Momentary power outage or sag
- Voltage drop from undersized conductors
Recommended Inspection Steps
- Measure incoming voltage on all phases
- Check conductor sizing per NEC requirements
- Verify transformer tap settings
- Install voltage stabilizer if utility power is unstable
Required Tools & Equipment
- Digital multimeter
- 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 U2 mean?
Fault code U2 on a Daikin EWAD chiller indicates: Power voltage abnormality. This is a warning alarm that requires diagnostic attention.
What causes Daikin EWAD alarm code U2?
Common causes include: Power supply voltage too high or too low; Momentary power outage or sag; Voltage drop from undersized conductors
How do I fix Daikin EWAD error code U2?
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.