4 |
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| 4. Service procedures | |
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Remote | Alarm |
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| Judgment and correction |
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controller | Judgment condition | Clear condition |
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contents |
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alarm display |
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P29 | Current detection | Inverter stops after alarm is | Recovery at restart | 1. Stops immediately when |
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| circuit trouble | detected. Alarm is output |
| restarted. |
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| • AC current value is | when inverter stops |
| • Layer short in the |
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| high even when | consecutively 4 times. |
| compressor |
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| compressor is |
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| 2. Check inverter control PCB. |
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| stopped. |
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| • Wiring trouble |
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| Compressor motor | Inverter stops after alarm is | Recovery at restart | 1. Refrigerant cycle trouble, |
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| output trouble, | detected. |
| overload operation |
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| Inverter compressor |
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| 2. Loose screws and contact |
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| trouble, |
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| failure between HIC control |
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| MDC trouble |
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| PCB and radiating plate |
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| 3. Cooling failure of radiating |
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| plate |
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| 4. Check outdoor unit PCB |
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| wiring. |
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| Compressor does not | Inverter stops after alarm is | Recovery at restart | 1. Compressor trouble (locked, |
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| run. (Overcurrent | detected. |
| etc.) |
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| protection circuit |
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| • Replace the compressor. |
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| activates after a certain |
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| 2. Compressor wiring trouble |
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| period of time following |
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| (missing phase) |
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| compressor start.) |
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| Compressor | Inverter stops after alarm is | Recovery at restart | 1. Check power voltage: AC |
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| breakdown | detected. |
| 203 V ± 20 V or 230 V ± 23 V. |
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| • Starts to operate but |
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| 2. Refrigerant cycle overload |
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| operating frequency |
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| operation |
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| drops and |
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| 3. Check AC current detection |
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| compressor stops. |
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| circuit. |
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| Inverter control PCB | Inverter stops after alarm is | Recovery at restart | Position detection circuit is |
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| position detection | detected. |
| activated even when the |
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| circuit trouble |
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| compressor 3P connector is |
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| disconnected and the |
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| compressor operated. |
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| • Replace the inverter control |
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| PCB. |
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F04 | Disconnection, open | 26, 30, 36 MODEL: | Automatic recovery | 1. Check discharge temp. |
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| circuit, or short circuit | Sensor detection trouble |
| sensor (TD). |
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| in discharge temp. | (194°F or higher when 15 |
| 2. Check outdoor unit control |
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| sensor (TD) | minutes have elapsed after |
| PCB. |
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| compressor stopped). |
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| (Open circuit) |
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| 42 MODEL: |
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| Sensor defection trouble |
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| (194°F or higher when 60 |
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| minutes have elapsed after |
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| compressor stopped). |
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| (Open circuit) |
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F06 | Disconnection, open | Open circuit or short circuit | Automatic recovery | 1. Check outdoor heat |
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| circuit, or short circuit |
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| exchanger temp. sensor (C1). |
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| in outdoor heat |
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| 2. Check outdoor unit control |
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| exchanger temp. |
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| PCB. |
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| sensor (C1) |
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F07 | Disconnection, open | Open circuit or short circuit | Automatic recovery | 1. Check outdoor heat |
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| circuit, or short circuit |
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| exchanger temp. sensor (C2). |
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| in outdoor heat |
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| 2. Check outdoor unit control |
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| exchanger temp. |
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| PCB. |
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| sensor (C2) |
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F08 | Disconnection, open | Open circuit or short circuit | Automatic recovery | 1. Check outdoor air temp. |
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| circuit, or short circuit |
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| sensor (TO). |
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| in outdoor air temp. |
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| |
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| 2. Check outdoor unit control |
| |
| sensor (TO) |
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| PCB. |
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F12 | Disconnection, open | Open circuit or short circuit | Automatic recovery | 1. Check intake temp. sensor |
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| circuit, or short circuit |
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| (TS). |
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| in intake temp. sensor |
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| 2. Check outdoor unit control |
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| (TS) |
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| PCB. |
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| SM831148 | |
