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| FILE NO. | |
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| Table |
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| Operation of diagnostic function |
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| Judgement and action |
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Block | Check |
| Symptom | Unit | Condition |
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code |
| status |
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[MODE] |
| The serial signal is not output | Operation | Displayed when | 1. | Outdoor unit does not completely |
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[TIMER] lamp |
| from outdoor unit to indoor unit. | continues. | error is detected |
| operate. |
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5Hz flash |
| • | Miscabling of |
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| • | Defective serial sending circuit |
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| • | miscabling |
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| • | on outdoor P.C. board |
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| Outdoor P.C. board check, P.C. board |
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| Defective serial receiving circuit |
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| • | cables check |
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| • | on outdoor P.C. board |
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| Compressor case thermo check |
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| Compressor case thermo |
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| 2. | In normal operation |
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| operation |
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| When outdoor sending serial LED |
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| (Green) flashes, the receiving serial |
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| LED (Orange) also flashes. : Indoor |
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| P.C. board (Main P.C. board) check |
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| When the receiving serial LED (Orange) |
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| does not flash: Outdoor P.C. board |
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| check |
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| BUS communication circuit error | Operation | Displayed when | 1. | Communication line check, miscabling |
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| * BUS communication was | continues | error is detected |
| check |
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| interrupted over the specified | (According |
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| Power supply check for central control |
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| time. | to remote |
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| (Central control remote control, etc.) |
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| control of |
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| and indoor unit |
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| indoor |
| 2. | Communication check (XY terminal) |
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| unit) |
| 3. | Indoor P.C. board check |
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| 4. | Central control check |
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| (Communication P.C. board) |
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| Error in | Operation | Displayed when | 1. | Check |
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| • | Indoor heat exchanger | continues. | error is detected | 2. | Check |
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| temperature rise after start of |
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| valve. |
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| • | cooling operation. |
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| 3. | Check indoor heat exchanger sensor |
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| Indoor heat exchanger |
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| (TC). |
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| temperature fall after start of |
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| 4. | Check indoor P.C. board |
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| heating operation. |
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| (Main P.C. board). |
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| Error in other cycles | Operation | Displayed when | 1. | Compressor case thermo operation. |
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| • | Indoor heat exchanger temp | continues. | error is detected | 2. |
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| (TC) does not vary after start of |
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| heat exchanger sensor. |
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| cooling/ heating operation. |
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| 3. | Check indoor heat exchanger sensor |
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| 4. | (TC). |
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| Check indoor P.C. board |
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| (Main P.C. board). |
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[MODE] lamp |
| Operation | Displayed when | 1. | Check indoor temp sensor (TA). |
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5Hz flash |
| short of indoor temp sensor (TA) | continues. | error is detected | 2. | Check indoor P.C. board |
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| (Main P.C. board). |
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| Operation | Displayed when | 1. | Check indoor temp sensor (TC). |
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| short of indoor temp sensor (TC) | continues. | error is detected | 2. | Check indoor P.C. board |
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| (Main P.C. board). |
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| Operation | Displayed when | 1. | Check indoor temp sensor (TCJ). |
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| short of indoor temp sensor | continues. | error is detected | 2. | Check indoor P.C. board (Main P.C. |
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| (TCJ) |
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| board). |
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[MODE] lamp |
| Error in indoor fan system | All stop | Displayed when | 1. | Check indoor fan motor connector |
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5Hz flash |
| Revolutions frequency error of fan |
| error is detected |
| circuit (CN210). |
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| 2. | Check indoor fan. |
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| 3. | Check indoor P.C. board |
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| (Main P.C. board). |
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| Error in indoor unit or other | Operation | Displayed when | 1. | Check indoor P.C. board |
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| positions | continues. | error is detected |
| (EEPROM and peripheral circuits) |
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| 1. EEPROM access error |
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| (Main P.C. board). |
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| Outside error input | Operation | Displayed when | 1. | Check outside devices. |
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| Detected by input voltage level | continues. | error is detected | 2. | Check indoor P.C. board |
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| from outside devices |
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| (Main P.C. board). |
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| Outside interlock input | All stop | Displayed when |
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| Detected by input voltage level |
| error is detected |
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| from outside devices |
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*: No display in the setting at shipment
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