Daikin WME Fault Code U0
Daikin WME Fault Code U0 is a warning alarm indicating: Refrigerant shortage. The most common causes include Refrigerant leak. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Refrigerant shortage
Brand: Daikin | Model: WME (Water-Cooled Screw Chiller) | Code: U0 | 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
- Refrigerant leak
- Expansion valve not opening
- Low pressure sensor reading incorrect
Recommended Inspection Steps
- Perform leak test
- Check expansion valve
- Verify low pressure sensor
- Repair and recharge
Required Tools & Equipment
- EPA-certified refrigerant recovery unit
- Electronic leak detector
- 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 WME codes that may be related:
OEM Service Manual Reference
OEM Reference: Daikin WME Water-Cooled Screw Chiller Service Manual. Available through Daikin Applied technical support.
Frequently Asked Questions
What does Daikin WME fault code U0 mean?
Fault code U0 on a Daikin WME chiller indicates: Refrigerant shortage. This is a warning alarm that requires diagnostic attention.
What causes Daikin WME alarm code U0?
Common causes include: Refrigerant leak; Expansion valve not opening; Low pressure sensor reading incorrect
How do I fix Daikin WME error code U0?
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.