|Alarm Code||P03, P17, P18|
|Alarm meaning||Compressor 1 discharge temperature trouble; Compressor 2 discharge temperature trouble; Compressor 3 discharge temperature trouble|
|Alarm conditions||Temperature is 106°C or higher and pre-trip stop has occurred. The alarm occurs when pre-trip stop occurs more than once. However the pre-trip counter is cleared if the compressor operates continuously for a specified length of time.|
1. Clogging of capillaries
Trouble: Compressor discharge temperature does not decrease even when the liquid valve is ON.
Check: When the liquid valve is operating and the liquid valve is ON, check that the secondary side of the liquid capillaries is cold.
2. Insufficient refrigerant
Trouble: Liquid effectiveness is poor.
Check: Check whether or not the superheating temperature is declining if the evaporator mechanical valve is opened to 300 pulses or more (after checking for foreign object intrusion).
3. Foreign object intrusion
Trouble: Liquid valve effectiveness is poor.
Check: Check that there is no difference in the condensation or frost conditions between the strainer primary-side and secondary-side tubing.
4. Crossed thermistor
Trouble: The discharge temperature of the other compressor is high although only this compressor is operating. When the liquid valve turns ON, the discharge temperature of the other compressor decreases.
5. Accumulation of refrigerant in stopped outdoor units
6. Sensor failure
7. If the cause is still unknown after checking the above, then it is possible that electrical noise is the cause of the trouble.
|Example||All of the probable causes|
|Notes||Operates continuously for a set length of time. Indicates 2.5 minutes or longer for an inverter unit and 30 seconds or longer for a constant-speed compressor.|