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Trouble Diagnosis
3. W-2WAY ECO-i Alarm Codes
P03, P17, P18 Alarm
Alarm code | P03, P17, P18 |
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Alarm meaning | Compressor 1 discharge temperature trouble; Compressor 2 discharge temperature trouble; |
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| Compressor 3 discharge temperature trouble |
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Alarm conditions |
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| This alarm occurs when the |
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| compressor has operated continuously for a certain length of time. |
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Probable cause | (1) | Operation failure of mechanical valve 3 |
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| (2) | Clogging of mechanical valve 3 |
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| (3) | Insufficient amount of refrigerant (including trouble resulting from an insufficient initial charge |
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| and from gas leakage) |
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| (4) | Blocking of |
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| (5) | Crossing (tubing or PCB connectors) with the other compressor thermistor |
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| (6) | Expansion valve operation failure |
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| (7) | Accumulation of refrigerant at stopped outdoor units |
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| (8) | Compressor discharge sensor failure |
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| (9) | PCB failure (A/D conversion failure) |
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Check | (1) | Operation failure of mechanical valve 3 |
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| Trouble: The compressor discharge temperature does not decrease even when |
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| mechanical valve 3 is opened to 480 pulses. | |
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| Check: Check whether or not mechanical valve 3 makes a grinding sound when the power is reset. | |
(2)Clogging of mechanical valve 3
Trouble: The compressor discharge temperature does not decrease even when mechanical valve 3 is ON.
Check: If mechanical valve 3 is open to 480 pulses, then check whether or not the secondary side of the valve is cold.
(3)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).
(4)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
(5)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.
(6)Accumulation of refrigerant in stopped outdoor units
Trouble: • System is OK when all outdoor units are operating, however symptoms of insufficient gas occur when a certain outdoor unit is stopped.
•Condensation or frost is visible up to the top of the accumulator of the stopped outdoor unit.
•After an outdoor unit stops, there is the sound of refrigerant flowing into an outdoor unit that was stopped for a long time.
•When an outdoor unit starts after being stopped for a long time, the start is
accompanied by much vibration.
Check: • In some cases, leakage may be occurring from the evaporator mechanical valve or mechanical valve 3 at a stopped outdoor unit.
(7)Sensor failure
Check: • This alarm is likely to occur when wiring is partially cut. (It is difficult to identify, even
when continuity is checked.) The detected discharge temperature is high.
•Although such conditions rarely occur, a P02 alarm is likely if the detected discharge temperature is low.
•Replace the sensor with another discharge sensor and compare the temperature conditions.
Correction | (1) | Replace the sensor. |
| (2) | Replace the outdoor unit PCB. |
| (3) | Correct the problem locations. |
Example | All of the probable causes | |
Notes | Operates continuously for a set length of time. | |
| Indicates 2.5 minutes or longer for an inverter compressor (compressor 1) and 30 seconds or | |
| longer for a | |
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