f6
Moderate
Daikin · Mini-Splits & Ductless Systems
Refrigerant Overcharge
Quick Answer
Error code F6 on your Daikin Mini-Splits & Ductless Systems means: Refrigerant Overcharge. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Connect gauges and compare operating pressures to the expected range for current conditions
2
Measure subcooling at the condenser outlet (excessively high subcooling indicates overcharge)
3
Verify the line set length and compare to the factory charge documentation
4
A licensed HVAC technician must recover excess refrigerant into a DOT-approved recovery cylinder
5
Recheck charge after adjustment using superheat/subcooling method per Daikin specifications
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 recovery cylinder
Refrigerant gauges
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