Malfunction and Protection Code Table. The display board in digital scroll system is just to display running conditions and malfunction information. The manual button is just to check the address code and power code of indoor units.
Malfunction and Protection Code Table:
| Error Codes | Contents |
|---|---|
| E0 | Phase sequence or lack of phase |
| E1 | Communication malfunction |
| E2 | T1 sensor malfunction |
| E3 | T2A sensor malfunction |
| E4 | T2B sensor malfunction |
| E5 | T3 sensor malfunction |
| E6 | Over-zero checking malfunction |
| E7 | EEPROM malfunction |
| E8 | Fan motor checking out of control |
| E9 | Communication malfunction between PCB and Display board |
| EF | Other malfunction |
| EE | Water level checking malfunction |
| ED | Outdoor protection |
| EC | Clear malfunction |
| EB | Inverter Module Protection |
| EA | Compressor Over-current (4 times) |
| P0 | Evaporator Temp. Protection |
| P1 | Anti-cooling or Defrost Protection |
| P2 | Condenser High Temp. Protection |
| P3 | Compressor Temp. Protection |
| P4 | Discharge Pipe Temp. Protection |
| P5 | Discharge High-pressure Protection |
| P6 | Discharge Low-pressure Protection |
| P7 | Power Lack/Over Volt Protection |
| P8 | Compressor Over-current |
| PF | Other Protection |
| PE | Oil Balance |
| PD | Oil Return |
| H1 | Net communication malfunction |
| H2 | Outdoor decreasing malfunction (valid for host unit) |
| H3 | Outdoor adding malfunction (valid for host unit) |
Troubleshooting
The air-conditioner does not run after pressing ON/OFF button.
Communication malfunction between outdoor units (Only valid for 20,30HP)
Display: The outdoor unit digital diode is displaying “E0”
Solutions:
- Check if communication cable is broken off
- Exchange P, Q line if there is no broken circuit
Phase sequence error
Display: The outdoor unit digital diode is displaying “E1”
Solutions:
- Check if the voltage between the power line terminals A, B, C of outdoor units and N is normally 220v. If not please check whether the power lines are well connected.
- After checking the voltage without finding any error, please transpose any two of the outdoor units power lines (A, B.C.)
Communication trouble between indoor unit and outdoor unit
Display: Outdoor unit digital diode is displaying “E2” and the timer lamp on the display board of the indoor unit, which has the communication trouble blinks.
Solutions:
- Check if communication cable is broken off
- Exchange P, Q line if there is no broken circuit
Outdoor unit temperature sensor abnormal
Display: Outdoor unit digital diode is displaying E3, E4, E5, and E7 (Only valid for 20,30HP)
Solutions:
- Measure T3, T4, T5, T6 electric resistance respectively and replace the broken one if the electric resistance is not correct.
- If the electric resistance is normal, please test the outdoor PCB and change a new one if it does not work well.
Indoor unit temperature sensor abnormal
Display: The operation lamp of the indoor unit blinks
Solutions:
- Measure T1, T2, and T3 electric resistance respectively to see if there is an open or short circuit
- If the electric resistance is normal, please test the indoor PCB and change a new one if it does not work well.
Water-level switch abnormal
Display: Outdoor unit digital diode display “E6” and Indoor unit alarm lamp blinks
Method: Check if the water level switch is closed and replace a new switch if the old one is bad.
The address of outdoor unit malfunction (Only valid for 20,30HP)
Display: Outdoor unit digital diode display “E8”
Method: Check the address code of outdoor unit PCB and make sure the address code in the right position
After running a while the system stops to perform protection.
Water level alarming trouble
Display: Indoor unit alarm lamp blinks
Solutions:
- Check if water pump runs well
- Check if the drainpipe is broken
- Check if the water level switch is blocked
- If the above situations do not occur please change a new indoor PCB
High-pressure protection
Display: The outdoor unit digital diode is displaying:”P1”
Solutions:
- Check if the high-pressure protection switch is broken or loosen
- Test if the discharge temperature of the compressor is too high. If the discharge temperature is too high and the current is lower than the rated current, the system is probably lack of refrigerant and replenishes it.
- Test if the pressure (high pressure) is too high or the current is overloaded. If so the possible causes are: the overcharge of refrigerant, the system air leakage, or bad ventilation conditions.
Low-pressure protection
Display: The outdoor unit digital diode is displaying:”P2”
Solutions:
- Check if the low pressure protection switch is broken or loosen
- Test if the pressure (low pressure) is too low. The probable reasons are: the overcharge of refrigerant or system blockade.
Over current protection
Display: The outdoor unit diode. Is displaying:”P3”
Solutions:
- Check if the current is overloaded.
- The possible reasons for the over current are: the overcharge of refrigerant, air leakage, and bad ventilation and heat-emission conditions.
Compressor discharge temperature protection, Condenser high temperature protection
Display: P4/ P5 is displayed on the outdoor unit diode
Solutions:
- Test digital discharge temperature, outdoor condenser T3 temperature
- Test system pressure
- High digital discharge temperature is likely owing to the lack of refrigerant, air leakage or system blockade. Check the above items respectively to solve the problem.
- Condenser high temperature protection owes to the overcharge of refrigerant, air leakage or bad ventilation and heat-emission conditions.
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