|Alarm Code||F04, F05, F22|
|Alarm meaning||Compressor 1 discharge temperature sensor trouble, compressor 2 discharge temperature sensor trouble, Compressor 3 discharge temperature sensor trouble.|
1. Sensor malfunction and outdoor unit PCB failure
2. Crossed wiring or installation error
Although the other compressor is operating and this compressor is stopped, the discharge temperature of the other compressor does not increase and the discharge temperature of this compressor rises.
Check for crossed wiring and installation errors.
3. Leakage from the discharge tube check valve
Although the other compressor is operating and this compressor is stopped, the discharge temperature of this compressor rises together with the temperature of the other compressor.
4. The ambient temperature around the outdoor unit when it is stopped is 43 °C or higher.
5. If the cause is still unknown after checking the above, then it is possible that electrical noise is the cause of the trouble. It is necessary to provide a line filter or carry out other noise countermeasures.
|Example||Sensor wiring is partially cut.|
|Notes||This alarm does not indicate that the sensor is disconnected. In order to prevent overheating during operation, the outdoor units in this system will not allow a compressor to start if the discharge temperature does not decrease while the compressor is stopped. If a sensor malfunction results in continuous detection of a high discharge temperature, then the compressor may stop for no apparent reason. The purpose of this alarm is to facilitate identification of the problem in this case.|