Daikin Error Code F6: Refrigerant Overcharge
Warning: Your Daikin HVAC system has detected a refrigerant overcharge, which could cause damage. Turn off the system and call a professional.
How to Fix Daikin Code F6
- Step 1: Turn off your Daikin HVAC system at the thermostat and the circuit breaker to prevent further operation.
- Step 2: Do not attempt to open the unit or handle the refrigerant lines yourself, as this can be dangerous.
- Step 3: Contact a Daikin-authorized HVAC technician to diagnose and repair the issue.
How to Reset Daikin Code F6
- Turn off the unit using the remote control or wall controller.
- Turn off the circuit breaker for the outdoor and indoor units. Wait 60 seconds.
- Restore power at the breaker.
- Turn the unit on with the remote control. If the error returns, the fault needs professional diagnosis.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Daikin Error Code F6 Mean?
The Daikin F6 error code indicates that your HVAC system has too much refrigerant, a condition known as overcharging. This can lead to reduced system efficiency, increased wear and tear on components, and even damage to your unit. It's important to address this issue promptly to prevent further problems.
Common Causes
- Improper refrigerant charging during installation or maintenance
- Leak in the refrigerant lines or components
- Incorrect system sizing or configuration
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| System is running and displaying F6 error | Measure the system's refrigerant pressure using a manifold gauge set | Pressure should be within the manufacturer's specified range for your Daikin model. If it's significantly higher, the system is likely overcharged. |
| Pressure is high | Inspect the system for any signs of leaks, such as oil residue or frost on lines | No visible leaks. If leaks are found, they should be repaired before addressing the overcharge. |
Applicable Daikin Models
- Daikin Comfort(electric)
- Daikin Fit(electric)
- Daikin Intelligent Touch(electric)
- Daikin Latitude(electric)
- Daikin Unitary System(electric)
- FIT(electric)
- Inverter Ducted Split System(electric)
- LV Series(electric)
- MXS(electric)
- Multi-Zone(electric)
- NCB(electric)
- NCM(electric)
- NCV(electric)
- NCW(electric)
- NMB(electric)
- NMP(electric)
- NPE(electric)
- NTV(electric)
- NW(gas)
- NWZ(dual_fuel)
- Quaternity(electric)
- SkyAir(electric)
- VRV(electric)
- VRV IV(electric)
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Refrigerant manifold gauge set | — | — | — |
| Refrigerant recovery machine | — | — | — |
Related Codes on Same Models
Other codes that affect the same Daikin model families as F6.
| Code | Description | Severity |
|---|---|---|
| A1 | Indoor PCB Defective | Warning |
| A3 | Drain Level System Fault | Warning |
| A5 | Freeze-Up/Overheat Protection | Warning |
| A6 | Fan Motor Lock/Overcurrent | Warning |
| E3 | High Pressure Switch Activated | Warning |
| E4 | Low Pressure Switch Activated | Warning |
| E5 | Compressor Motor Lock | Warning |
| E6 | Standard Compressor Motor | Warning |
| E7 | Outdoor Fan Motor Lock | Warning |
| F3 | Discharge Pipe Temp High | Warning |