Daikin Error Code E3: High Pressure Switch Activated
Warning: Your Daikin HVAC system has encountered a high-pressure issue and has shut down to prevent damage. Call a professional for repair.
How to Fix Daikin Code E3
- Check and replace your air filters if they are dirty. This can help restore normal airflow and pressure in your system.
- If your system is low on refrigerant, do not attempt to add more yourself. Call a professional HVAC technician to diagnose and repair the leak.
- If the issue persists after checking and replacing your air filters, call a professional HVAC technician to diagnose and repair the issue.
How to Reset Daikin Code E3
- 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 E3 Mean?
The Daikin E3 error code indicates that the high-pressure switch has been activated. This switch is designed to protect your HVAC system from excessive pressure, which can cause damage to the compressor and other components. When this error occurs, your Daikin system will shut down to prevent further issues. The most common causes for this error are refrigerant leaks, clogged filters, or a faulty expansion valve.
Common Causes
- Refrigerant leak, which can be caused by a damaged or worn-out component in your HVAC system.
- Clogged air filters, which can restrict airflow and cause pressure buildup in the system.
- Faulty expansion valve, which may not be opening fully to allow refrigerant to flow into the evaporator coil.
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Your Daikin HVAC system is not cooling or heating properly | Measure the pressure in the suction line using a manifold gauge set | Normal suction pressure (consult Daikin's technical manual for specific values) |
| You notice ice buildup on the outdoor unit | Check the airflow through the indoor unit | Normal airflow, no restriction |
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 |
|---|---|---|---|
| High-Pressure Switch | 4728N1A001 | — | Find Part |
| Expansion Valve | 4728N1A002 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Daikin model families as E3.
| Code | Description | Severity |
|---|---|---|
| A1 | Indoor PCB Defective | Warning |
| A3 | Drain Level System Fault | Warning |
| A5 | Freeze-Up/Overheat Protection | Warning |
| C4 | Heat Exchanger Thermistor Fault | Warning |
| E1 | Outdoor PCB Defective | Warning |
| E4 | Low Pressure Switch Activated | Warning |
| E5 | Compressor Motor Lock | Warning |
| E6 | Standard Compressor Motor | Warning |
| F3 | Discharge Pipe Temp High | Warning |
| H6 | Position Sensor Fault | Warning |