Table
| Operation of diagnostic function |
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| Judgement and action | |
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Check code | Symptom | Unit status | Condition |
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| Inverter | All stop | Displayed when | 1. | Inverter immediately stops even if restarted. |
| operates. |
| error is detected |
| • Compressor rare short |
| (For a short time) |
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| 2. | Check IPDU. |
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| • Cabling error |
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| Error on current detection circuit | All stop | Displayed when | 1. | Compressor immediately stops even if restarted. |
| • Current value is high at AC side even |
| error is detected |
| : Check IPDU. |
| while compressor stops. |
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| 2. | |
| • Phase of power supply is missed. |
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| • Check power voltage of R, S, T. |
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| All stop | Displayed when | 1. | Check outdoor temp sensor (TE, TS). | |
| outdoor temp sensor |
| error is detected | 2. | Check CDB. |
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| All stop | Displayed when | 1. | Check outdoor temp sensor (TD). | |
| outdoor temp sensor |
| error is detected | 2. | Check CDB. |
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| Compressor drive output error | All stop | Displayed when | 1. | Abnormal overload operation of refrigerating |
| • Tin thermistor temp, Tin error |
| error is detected |
| cycle |
| (IPDU heat sink temp. is high.) |
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| 2. | Loosening of screws and contact error of IPDU |
| Communication error between IPDU |
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| and heat sink |
| • Connector |
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| 3. | Cooling error of heat sink |
| IPDU |
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| 4. | Check cabling of CDB and IPDU. |
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| Compressor does not rotate. | All stop | Displayed when | 1. | Compressor error (Compressor lock, etc.) |
| protective circuit works when constant time |
| error is detected |
| : Replace compressor. |
| passed after activation of compressor.) |
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| 2. | Cabling trouble of compressor (Phase missing) |
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| Discharge temp error | All stop | Displayed when | 1. | Check refrigerating cycle. (Gas leak) |
| • Discharge temp over specified value was |
| error is detected | 2. | Error of electron control valve |
| detected. |
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| 3. | Check pipe sensor (TD). |
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| Compressor breakdown | All stop | Displayed when | 1. | Check power voltage. (AC200V±20V) |
| • Operation frequency lowered and stops |
| error is detected | 2. | Overload operation of refrigerating cycle |
| though operation had started. |
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| 3. | Check current detection circuit at AC side. |
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| All stop | Displayed when | 1. | Overload operation of refrigerating cycle | |
| • TE temp over specified value was |
| error is detected | 2. | Check outdoor temp sensor (TE). |
| detected. |
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| DC outdoor fan motor error | All stop | Displayed when | 1. | Position detection error |
| • IDC operation or lock was detected by |
| error is detected | 2. | |
| DC outdoor fan driving. |
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| outdoor fan drive unit |
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| • Check CDB. |
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| • Refer to Judgment of outdoor fan. |
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| Error on IPDU position detection circuit | All stop | Displayed when | 1. | Position detection circuit operates even if driving |
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| error is detected |
| by removing 3P connector of compressor. |
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| • Replace IPDU. |
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| Operation | Displayed when | 1. | Check outdoor temp sensor (TO). | |
| outdoor temp sensor | continues. | error is detected | 2. | Check P.C. board. |
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