f3
Moderate
Daikin · Mini-Splits & Ductless Systems
Discharge Temperature Too High
Quick Answer
Error code F3 on your Daikin Mini-Splits & Ductless Systems means: Discharge Temperature Too High. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Check the discharge line temperature with a thermometer or thermocouple (should not exceed 225 degrees F)
2
Verify refrigerant charge by checking superheat and subcooling values
3
Inspect the expansion valve for proper operation
4
Check for restrictions in the liquid line or filter drier
5
A licensed HVAC technician should perform refrigerant system diagnostics and repairs
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
Expansion valve
Filter drier
Refrigerant (R-410A or R-32)
Discharge thermistor
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