
4. W-2WAY ECO-i Alarm Codes
P04 Alarm
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| Alarm code | P04 |
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| Alarm meaning | ||
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| Alarm conditions | The operation of the electronic circuit in the | |
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| depending on the pressure. A pressure of 478.6 psi or above will | |
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| the terminal is | |
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| Probable cause | (1) | Failure of the check valve in the compressor discharge tube. |
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| (2) | The service valve is closed. |
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| (3) | Clogging of the outdoor heat exchanger during cooling. |
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| (4) | An air short in the outdoor unit during cooling. |
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| (5) | Failure of the outdoor fan during cooling. |
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| (6) | Clogging of the air filter in the indoor unit during heating. |
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| (7) | An air short in the indoor unit during heating. |
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| (8) | Failure of the indoor fan during heating. |
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| (9) | Clogging of the refrigerant circuit. |
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| (10) | Failure of the mechanical valve. |
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| (11) | Failure of the solenoid valve kit. |
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| (12) | Too much refrigerant has been charged. |
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| (13) | Failure of the |
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| Check | (1) | Make sure that the |
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| (2) | If the |
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| when the |
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| than 478.6 psi. The following describes checks to be made when the pressure is high. |
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| (3) | During cooling, check whether the outdoor unit heat exchanger is clogged. Remove any |
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| foreign material that prevents ventilation. |
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| (4) | During cooling, check whether an air short blockage has occurred in the outdoor unit. The |
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| system is operating normally unless the temperature around the outdoor unit is excessively high. |
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| (5) | During cooling, check for outdoor fan failure. Check whether the screws securing the fan are |
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| loose and whether the fan connector in the outdoor unit PCB is properly connected. |
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| (6) | During heating, check whether the air filters in the indoor unit are clogged. If clogged, clean |
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| the filters. |
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| (7) | During heating, check whether an air short blockage has occurred in the indoor unit. The |
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| system operates normally unless the temperature around the indoor unit is excessively high. |
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| (8) | During heating, check for indoor fan failure. |
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| (9) | Check whether the refrigerant circuit is clogged. Check that all service valves are closed. |
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| Check whether welded locations are clogged. |
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| (10) | Check for mechanical valve failure. Check whether the mechanical valves make a clattering |
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| sound when the power is reset. Since the mechanical valve in the indoor unit is in a location |
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| that makes aural inspection difficult, use an electric means to check. Check that the | |
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| connector pin of the mechanical valve on the PCB outputs 4 V. In addition, check that the coil | |
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| resistance of the mechanical valve is several tens of Ohm (Ω). |
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| (11) | Check for solenoid valve kit failure. Removing a coil that is on will result in a clicking sound. |
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| Also, removing a coil that is off will not produce such a sound. |
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| (12) | Check whether too much refrigerant has been charged. Too much refrigerant has been |
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| charged if the |
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| Correction | Replace damaged components and correct the amount of charged refrigerant. | |
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| Example | — |
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| Notes | — |
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| P05 Alarm |
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| Alarm code | P05 |
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| Alarm meaning | Reverse phase (or missing phase) detected | |
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| Alarm conditions | This alarm occurs when a reverse phase or missing phase is detected in the | |
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| Probable cause | Reverse phase or missing phase in the | |
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| Check | Check the wiring at the power terminal plate. | |
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| Correction | Switch the phases and reinsert. Check if the result is OK. | |
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| Example | — |
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| Notes | — |
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