Daikin Error Code E1: Outdoor PCB Defective
Warning: Your Daikin HVAC system has detected a fault with the outdoor PCB. It's safe to operate, but you should schedule a professional repair soon.
How to Fix Daikin Code E1
- Turn off your HVAC system at the thermostat and the circuit breaker to prevent further damage
- Contact a Daikin professional technician to schedule a repair
- Do not attempt to open the outdoor unit or perform any repairs yourself
How to Reset Daikin Code E1
- 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 E1 Mean?
The Daikin E1 error code indicates a defect in the outdoor PCB (Printed Circuit Board). This board controls various functions of your outdoor unit, including the compressor and fan. When it malfunctions, your system may not operate efficiently, or it might shut down entirely. It's important to address this issue promptly to prevent further damage or system failure.
Common Causes
- A short circuit or open circuit on the PCB due to component failure
- Excessive heat or moisture damaging the PCB
- Wiring issues connected to the PCB
- Faulty components connected to the PCB, such as the outdoor fan motor or compressor
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Outdoor unit is not running | Measure voltage at the PCB terminals using a multimeter | No voltage or incorrect voltage reading |
| Outdoor unit is running but not cooling | Inspect the outdoor fan for proper rotation and listen for unusual noises | Fan rotates and operates quietly |
| System shuts down after a short period | Check the outdoor unit's high-pressure switch for proper operation | Switch operates correctly and is not stuck open or closed |
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 |
|---|---|---|---|
| Outdoor PCB | 40122C0020 | — | Find Part |
| Outdoor Fan Motor | — | — | — |
Related Codes on Same Models
Other codes that affect the same Daikin model families as E1.
| 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 |
| C4 | Heat Exchanger Thermistor Fault | 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 |