Error codes – κωδικοί βλαβών κλιματιστικά Nobu.
Indoor Units: NBO-09IDU , NBO-12IDU , NBO-18IDU , NBO-24IDU
Outdoor Units: NBO-09ΟDU , NBO-12ΟDU , NBO-18ΟDU , NBO-24ΟDU
Indoor unit error display
| O – light | X – off | ⊗ – flash |
| Operation lamp | Timer lamp | Display | LED STATUS |
| 1 time | X | E0 | Indoor unit EEPROM parameter error |
| 2 times | X | E1 | Indoor / outdoor units communication error |
| 4 times | X | E3 | Indoor fan speed has been out of control |
| 5 times | X | E4 | Indoor room temperature sensor T1 open circuit or short circuit |
| 6 times | X | E5 | Evaporator coil temperature sensor T2 open circuit or short circuit |
| 7 times | X | EC | Refrigerant leakage detection |
| 1 time | O | F0 | Overload current protection |
| 2 times | O | F1 | Outdoor ambient temperature sensor T4 open circuit or short circuit |
| 3 times | O | F2 | Condenser coil temperature sensor T3 open circuit or short circuit |
| 4 times | O | F3 | Compressor discharge temperature sensor T5 open circuit or short circuit |
| 5 times | O | F4 | Outdoor unit EEPROM parameter error |
| 6 times | O | F5 | Outdoor fan speed has been out of control |
| 1 time | ⊗ | P0 | IPM malfunction or IGBT over-strong current protection |
| 2 times | ⊗ | P1 | Over voltage or over low voltage protection |
| 3 times | ⊗ | P2 | High temperature protection of IPM module or compressor |
| 4 times | ⊗ | P3* | Outdoor ambient temperature too low |
| 5 times | ⊗ | P4 | Inverter compressor drive error |
* P3
1. In heating mode, when the outdoor temperature is lower than -13°F (-25℃) for 1 hour, the indoor unit display error code P3.
2. If the outdoor temperature is higher than -7.6°F (-22℃) for 10 minutes and compressor stop for 1 hour or outdoor temperature is higher than 23°F (-5℃) for 10 minutes, then the unit will return to work.
Explanation of error codes
E0 (indoor) / F4 (outdoor) Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip.
E1 – Indoor unit does not receive the feedback from outdoor unit during 110 seconds and this condition happens four times continuously.
E3/F5 – When indoor fan speed is too low (300RPM) for certain time, the unit will stop and the LED will display the failure.
E4/E5/F1/F2/F3 – If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.
EC – Define the initial evaporator coil temperature T2 when the compressor just starts running as Tcool. In the first 5 minutes after the compressor starts up in cooling mode, if T2<Tcool-2℃ (Tcool – 35.6℃) does not keep continuous 4 seconds and this situation happens 3 times, the display area will show “EC” and the unit will turn off . T2 sensor faulty – Indoor PCB faulty – System problems, such as leakage or blocking.
F0 – An abnormal current rise is detected by checking the specified current detection circuit.
P0 – When the voltage signal that IPM send to compressor drive chip is abnormal, the display LED will show “P0” and AC will turn off .
P1 – An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit.
P2 – If the sampling voltage is not 5V, the LED will display the failure.
P4 – An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on. Error codes – κωδικοί βλαβών κλιματιστικά Nobu.
