Any malfunction your Single / Multi-Split Air Conditioner inside head unit might be experiencing will be identified by a specific sequence of blinking LED indicator lights located at the right inferior corner. Consult the table below in order to know which error has been detected on your unit so that you may reach out to your installation contractor for any assistance by providing them problem clarification.
| Error Code | Description | No. of Times Indoor Unit LEDs Blink | |
|---|---|---|---|
| LED1 (Heating LED) | LED2 (Cooling LED) | ||
| 1 | Indoor unit return air thermistor has disconnected or has shorted out. | 1X | — |
| 2 | Indoor unit inlet pipe thermistor has disconnected or has shorted out. | 2X | — |
| 5 | Communication failure from indoor unit to outdoor unit. | 5X | — |
| 6 | Indoor unit outlet pipe thermistor has disconnected or has shorted out. | 6X | — |
| 9 | Indoor unit EEPROM error | 9X | — |
| 10 | Indoor unit fan has locked up (fan motor operation failure). | — | 1X |
| 12 | Indoor unit middle pipe thermistor has disconnected or has shorted out. | 2X | 1X |
| 21 | DC peak error / IPM fault; compressor DC voltage was too high. | 2X | 1X |
| 22 | Current transformer2 (CT2) error; AC input current is too high. | 2X | 2X |
| 23 | DC link voltage is too low. | 2X | 3X |
| 25 | Voltage to the system is too low or too high. | 2X | 5X |
| 26 | Inverter compressor has seized up or is not providing rotation. | 2X | 6X |
| 27 | Prospective short circuit (PSC) fault error; current to inverter compressor between AC and DC converter circuit is too high. | 2X | 7X |
| 28 | Inverter compressor DC voltage is too high. | 2X | 8X |
| 29 | Inverter compressor amperage is too high. | 2X | 9X |
| 31 | Current to the current transformer (CT) thermistor is too low. | 3X | 1X |
| 32 | Inverter compressor discharge pipe temperature is too high. | 3X | 2X |
| 40 | Current transformer (CT) thermistor has disconnected or has shorted out. | 4X | — |
| 41 | Inverter compressor discharge pipe thermistor has disconnected or has shorted out. | 4X | 1X |
| 44 | Outdoor unit inlet air thermistor has disconnected or has shorted out. | 4X | 4X |
| 45 | Outdoor unit condenser coil middle thermistor has disconnected or has shorted out. | 4X | 5X |
| 46 | Outdoor unit suction line thermistor has disconnected or has shorted out. | 4X | 6X |
| 48 | Outdoor unit coil outlet (liquid line) thermistor has disconnected or has shorted out. | 4X | 8X |
| 53 | Communication failure from outdoor unit to indoor unit. | 5X | 3X |
| 60 | Outdoor unit PCB EEPROM check sum error. | 6X | — |
| 61 | Outdoor unit condenser coil temperature is too high. | 6X | 1X |
| 62 | Outdoor unit inverter compressor PCB heat sink temperature is too high. | 6X | 2X |
| 63 | Condenser coil pipe thermistor temperature is too low. | 6X | 3X |
| 65 | Heat sink thermistor has disconnected or has shorted out. | 6X | 5X |
| 67 | Outdoor BLDC fan motor lock error | 6X | 7X |
Error CH05 may take place by there is poor / communication between the indoor unit and the outdoor unit.
Does CH53 occur immediately after installing a new product, or installing a used product at other place?
CH53 code is a function detecting abnormal communication between the indoor unit and the outdoor unit of an
inverter air-conditioner.
If it occurs right after the product is installed, then ask the installation technician to check if the
communication cables are wired properly with no misconnections?
Does CH53 occur during running the product, not immediately after installing?
An error code that occurs in the product may be a temporary error due to unstable electricity supply or other electrical factors. Turn the power off or trip the circuit breaker for the product, and then reset the breaker about 5 minutes later.
If same symptom persists after power reset, have it checked by a service technician.
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