u0
Moderate
Daikin · Mini-Splits & Ductless Systems
Low Refrigerant Detection
Quick Answer
Error code U0 on your Daikin Mini-Splits & Ductless Systems means: Low Refrigerant Detection. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Check suction and discharge pressures with a gauge manifold set
2
Perform a thorough leak check on all flare connections, brazed joints, and coil surfaces
3
Check for oil stains at connections which indicate a refrigerant leak
4
Verify the line set length and confirm proper charge adjustment was made during installation
5
Refrigerant leak repair and recharging must be performed by an EPA-certified licensed HVAC technician
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Refrigerant (R-410A or R-32)
Flare fittings
Brazing materials
Leak detection equipment
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