EE

Meaning: Indoor unit PCB error.

Likely Cause: The system failed to read or verify data from the EEPROM memory on the indoor PCB.

Troubleshooting: Replace the indoor PCB board with a new one.

E1

Meaning: Abnormal feedback from the indoor fan motor.

Likely Cause: 1. Fan blades may be stuck, preventing rotation.
2. The PCB is not receiving signal feedback from the motor.

Troubleshooting: 1. Check the indoor fan for mechanical issues (blockage or obstruction).
2. Replace the indoor PCB if it's not processing feedback properly.
3. If the problem persists, replace the indoor fan motor.

E3

Meaning: Fault in the indoor unit coil temperature sensor.

Likely Cause: 1. The sensor has become loose or disconnected.
2. The sensor is damaged.

Troubleshooting: 1. Reconnect the sensor securely.
2. Check the resistance of the sensor using a multimeter to verify it’s within the normal range. Replace the sensor if readings are abnormal.

E4

Meaning: Indoor ambient temperature sensor is abnormal.

Likely Cause: 1. The sensor has fallen off or is loose.
2. The sensor is damaged.

Troubleshooting: 1. Reconnect the sensor.
2. Test the sensor’s resistance using a multimeter to confirm it’s within the normal range. Replace if faulty.

E0

Meaning: EEPROM error in the outdoor unit PCB (Printed Circuit Board).

Likely Cause: 1. The system failed to read or verify data stored in the outdoor PCB's EEPROM chip.
2. Possible data corruption or EEPROM failure.

Troubleshooting: Replace the outdoor PCB board with a new one.

E6

Meaning: Fault in communication between the indoor and outdoor units.

Likely Cause: 1. Incorrect or loose communication wiring.
2. Communication circuit on the PCB is damaged.

Troubleshooting: 1. Check that the communication wire is connected correctly and securely.
2. Test the communication circuits.
3. If a fault is found, replace the PCB board on the indoor and/or outdoor unit as needed.

F1

Meaning: Abnormal compressor startup. This could include phase loss or reverse rotation.

Likely Cause: 1. Incorrect wiring to the compressor.
2. Faulty or underperforming PCB board.

Try This First:

Before you begin, confirm whether the fault is persistent or intermittent:

1. On the indoor unit remote control, press the Display button 9 times.
2. You should hear a chime from the indoor unit and see the data code cycle on the display.
3. Once you hear the chime, power OFF both AC and DC supplies. 
4. Unplug the main AC power source. To shut off the circuit breaker, simply flip the fuse to the OFF position, or remove it entirely from the box. 
5. Disconnect the MC4 solar (DC) cable.
6. *Note: If you’ve installed a DC breaker switch, you can isolate the DC circuit by simply turning it OFF instead of unplugging the MC4 connectors.
7. If your heat pump runs on battery power, disconnect the DC Booster at both ends.
8. Wait 1 minute, then reconnect the MC4 cables and switch the AC circuit breaker back on by reconnecting the fuse in the ON position.
9. Power the unit back ON using the remote.
10. Turn the unit OFF, and then ON again to confirm whether the F1 error has cleared.

If the F1 error remains, please contact Ecosolaris or your local dealer or installer for further troubleshooting and repair.

Troubleshooting: 1. f wiring is fine, replace the PCB board.

F2

Meaning: Compressor start failure

Likely Cause: 1. Compressor overload during startup.2.
2. Loose wiring while the compressor is running.

Troubleshooting: 1. Inspect and tighten the compressor wiring.
2. If the issue persists, replace the PCB board.

F3

Meaning: IPM (Intelligent Power Module) fault.

Likely Cause: 1. A short circuit in the compressor.
2. A fault or abnormality in the PCB board.

Troubleshooting: 1. Inspect the compressor wiring for shorts or damage.
2. If wiring checks out, replace the PCB board

F4

Meaning: Compressor housing failure or thermal protection triggered.

Likely Cause: 1. Loose housing of the compressor.
2. Overheat protection is active (only applies to models with this feature).

Troubleshooting: 1. Reconnect the sensor attached to the compressor.
2. Check whether the thermal protection is triggered while the compressor is not running.

F5

Meaning: Exhaust air sensor failure.

Likely Cause: 1. Sensor terminals are loose or have fallen off.
2. The sensor itself is damaged.

Troubleshooting: 1. Reconnect the sensor securely.
2. Use a multimeter to check sensor resistance and confirm it is within the normal operating range.

F6

Meaning: Intake air sensor failure.

Likely Cause: 1. The sensor terminals are loose or disconnected.
2. The sensor is damaged.

Troubleshooting: 1. Reconnect the sensor securely.
2. Use a multimeter to check the sensor’s resistance and confirm it’s within the expected range.

F7

Meaning: Outdoor unit coil temperature sensor fault.

Likely Cause: 1. The sensor terminals are loose or disconnected.
2. The sensor is damaged.

Troubleshooting: 1. Reconnect the sensor securely.
2. Use a multimeter to check the sensor resistance and ensure it’s within the normal range.

F8

Meaning: Outdoor ambient temperature sensor is abnormal.

Likely Cause: 1. The sensor terminals are loose or disconnected.
2. The sensor is damaged.

Troubleshooting: 1. Reconnect the sensor securely.
2. Use a multimeter to check the sensor resistance and confirm it’s within the normal operating range.

F9

Meaning: Abnormal fan motor feedback from the outdoor unit.

Likely Cause: 1. Fan blades are stuck, preventing normal operation.
2. The PCB board is not receiving feedback from the motor.
3. Disconnection between the fan motor and PCB board.

Troubleshooting: 1. Check the performance and movement of the outdoor fan.
2. Replace the PCB board if feedback is not being received.
3. Replace the fan motor if it is unresponsive.

P1

Meaning: The outdoor unit has stopped due to AC current protection.

Likely Cause: 1. Poor heat dissipation from the outdoor unit during cooling mode.
2. Poor heat dissipation from the indoor unit during heating mode.

Try This First:

Check and clean the air inlets of both indoor and outdoor units to improve airflow and heat exchange.

P2

Meaning: The outdoor unit has stopped due to phase current protection.

Likely Cause: The compressor is overloaded, causing excessively high phase current at its current operating frequency.

Troubleshooting: 1. In cooling mode, inspect the outdoor unit and condenser.
2. In heating mode, inspect the indoor motor and evaporator.
3. If refrigerant was recently added, confirm it was done correctly and to spec.

P3

Meaning: Outdoor AC voltage is either too high or too low (voltage protection triggered).

Likely Cause: The AC input voltage for the outdoor unit is outside the allowed range of 150V to 265V.

Troubleshooting: 1. Check the AC power input to ensure it falls within the safe range.
2. If voltage is normal but the error persists, replace the outdoor PCB board.

P4

Meaning: DC bus voltage protection triggered. The voltage is either too high or too low.

Likely Cause: The DC input voltage for the indoor unit is outside the safe operating range of 140V to 396V.

Troubleshooting: 1. Check the DC input voltage to the indoor unit.
2. If voltage is within range but the error persists, replace the indoor PCB board.

P5

Meaning: IPM (Intelligent Power Module) overheat protection has been triggered.

Likely Cause: 1. Abnormal performance of the outdoor fan motor.
2. Blocked or dirty air inlet in the outdoor unit, leading to overheating.

Troubleshooting: 1. Check the outdoor fan motor and make sure the surrounding ambient temperature is within -15°C to 55°C.
2. Clean any debris or buildup in the air inlet.

P6

Meaning: Exhaust temperature is too high. Protection mode is activated.

Likely Cause: 1. Poor system heat dissipation.
2. Insufficient refrigerant charge.

Try This First:

Make sure the ambient temperature is within -15°C to 55°C.

Troubleshooting: 1. Check the outdoor fan motor to ensure it’s operating properly.
2. Verify the refrigerant charge amount meets system specifications.

P7

Meaning: Anti-freeze protection triggered on the inner refrigeration plate.

Likely Cause: 1. Indoor temperature too low.
2. Blocked or dirty air inlets on the indoor unit.
3. Low refrigerant charge leading to frosting.

Try This First:

Clean the indoor unit air filter thoroughly.

Troubleshooting: 1. Check the performance of the indoor fan motor.
2. Ensure proper refrigerant levels to prevent frosting.

P8

Meaning: Overheat protection triggered on the external coil during cooling mode.

Likely Cause: 1. Poor performance of the outdoor fan motor.
2. Dirty or blocked air inlets in the outdoor unit.

Try This First:

Clean the indoor unit's air filter to ensure proper airflow.

Troubleshooting: Check the indoor fan motor performance.

P9

Meaning: Overheat protection triggered on the inner coil during heating mode.

Likely Cause: 1. Indoor ambient temperature is too high.
2. Dirty or blocked air inlets on the indoor unit.

Try This First:

Clean the air filters and ensure airflow is not obstructed.

Troubleshooting: Check the performance of the indoor fan motor.

PC

Meaning: Outdoor temperature is too low for cooling mode. Protection triggered.

Likely Cause: In cooling mode, the outdoor temperature is below the minimum allowed operating limit.

Try This First:

1. If the outdoor temperature drops below -2°C, cooling is disabled.

2. Once the temperature rises to 0°C or above, the compressor will restart automatically.

PH

Meaning: Outdoor temperature too high for heating mode. Protection triggered.

Likely Cause: In heating mode, the outdoor temperature exceeds the system's safe limit.

Try This First:

1. If the outdoor temperature exceeds 33°C, heating is disabled.

2. The system will resume heating when the temperature drops below 31°C.