4. W-2WAY ECO-i Alarm Codes
P03, P17 Alarm |
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Alarm code | P03, P17 |
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Alarm meaning | Compressor 1 discharge temperature trouble; Compressor 2 discharge temperature trouble |
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Alarm conditions | Temperature is 222°F or higher and |
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| The alarm occurs when |
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| cleared if the compressor operates continuously for a specified length of time. |
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Probable cause | (1) Clogging of liquid valve capillaries |
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| (2) | Insufficient amount of refrigerant (including trouble resulting from an insufficient initial charge |
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| and from gas leakage) |
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| (3) | Blocking of |
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| (4) | Crossing (tubing or PCB connectors) with the other compressor thermistor |
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| (5) | Expansion valve operation failure |
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| (6) | Accumulation of refrigerant at stopped outdoor units |
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| (7) | Compressor discharge sensor failure |
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| (8) | PCB failure (A/D conversion failure) |
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| (9) | Electrical noise |
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Check | (1) Clogging of capillaries |
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| Trouble: Compressor discharge temperature does not decrease even when the liquid valve |
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| is ON. |
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| Check: | When the liquid valve is operating and the liquid valve is ON, check that the |
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| secondary side of the liquid capillaries is cold. |
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| (2) | Insufficient refrigerant |
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| Trouble: | Liquid effectiveness is poor. |
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| Check: | Check whether or not the superheating temperature is declining if the evaporator |
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| mechanical valve is opened to 300 pulses or more (after checking for foreign object |
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| intrusion). |
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| (3) | Foreign object intrusion |
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| Trouble: | Liquid valve effectiveness is poor. |
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| Check: | Check that there is no difference in the condensation or frost conditions between |
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| the strainer |
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| (4) | Crossed thermistor |
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| Trouble: The discharge temperature of the other compressor is high although only this |
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| compressor is operating. |
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| When the liquid valve turns ON, the discharge temperature of the other compressor |
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| decreases. |
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| (5) | Accumulation of refrigerant in stopped outdoor units |
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| Trouble: • System is OK when all outdoor units are operating, however symptoms of |
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| insufficient gas occur when a certain outdoor unit is stopped. |
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| • Condensation or frost is visible up to the top of the accumulator of the stopped |
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| outdoor unit. |
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| • After an outdoor unit stops, there is the sound of refrigerant flowing into an outdoor |
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| unit that was stopped for a long time. |
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| • When an outdoor unit starts after being stopped for a long time, the start is |
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| accompanied by much vibration. |
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| Check: • Representative parts include the liquid capillaries (secondary side of capillaries will |
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| be cool during cooling operation), mechanical valve, mechanical valve bypass check |
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| valve (sound of refrigerant flow can be heard, and stops when the liquid valve is |
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| closed), hot gas defrost valve (if valve secondary side remains hot even after much |
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| time has passed, be careful not to mistake transmitted heat for a valve failure). |
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| • Ice is growing on the lower parts of some outdoor unit heat exchangers but not on |
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| others. |
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| Because this trouble may occur even in outdoor units with a high operating rate |
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| under conditions of insufficient gas, caution is needed. |
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| (6) | Sensor failure |
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| Check: • This alarm is likely to occur when wiring is partially cut. (It is difficult to identify, even |
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| when continuity is checked.) The detected discharge temperature is high. |
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| • Although such conditions rarely occur, a P02 alarm is likely if the detected discharge |
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| temperature is low. |
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| • Replace the sensor with another discharge sensor and compare the temperature |
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| conditions. |
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| (7) | If the cause is still unknown after checking the above, then it is possible that electrical noise |
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| is the cause of the trouble. |
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Correction | (1) Replace the sensor. |
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| (2) | Replace the outdoor unit PCB. |
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| (3) | Correct the problem locations. |
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Example | All of the probable causes |
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Notes | Operates continuously for a set length of time. |
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| Indicates 2.5 minutes or longer for an inverter unit and 30 seconds or longer for a constant- |
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| speed compressor. |
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