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| FILE NO. |
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| Block distinction |
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| Operation of diagnosis function |
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Check | Block |
| Check |
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| Air | Display flashing | Action and Judgment | ||||
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| Cause of operation |
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| conditioner |
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code |
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| code |
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| error |
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| status |
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| Serial signal |
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| 1) Defective wiring of the |
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| Indoor unit | Flashes when | 1) to 3) The outdoor unit never | ||
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| and connecting |
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| connecting cable or |
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| operates | error is detected. | operate. | |
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| cable. |
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| continue. | Flashing stop | Check connecting cable and correct | ||
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| 2) Operation signal has not |
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| Outdoor unit | and outdoor unit | if defective wiring. | ||
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| send from the indoor unit |
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| stop. | start to operate | Check 25A fuse of inverter P.C. board. | |
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| when operation start. |
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| when the return | Check 3.15A fuse of inverter |
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| 3) Outdoor unit has not |
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| signal from the | P.C. board. | |
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| send return signal to the |
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| outdoor unit is | Check operation signal of the indoor |
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| indoor unit when operation |
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| normal. | unit by using diode. Measure voltage | |
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| started. |
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| at terminal block of the indoor unit |
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| 4) Return signal from the |
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| between No.2 and No.3 (or L2 and S) | |
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| outdoor unit is stop during |
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| If signal is varied |
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| operation. |
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| replace inverter P.C. board. |
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| Some protector |
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| If signal is not varied, replace indoor |
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| (hardware, if exist) of the |
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| P.C. board. |
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| outdoor unit open |
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| 4) The outdoor unit abnormal stop at |
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| circuit of signal. |
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| some time. |
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| Signal circuit of indoor |
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| If the other check codes are found |
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| P.C. board or outdoor |
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| concurrently, check them together. |
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| P.C. board is failure |
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| Check protector (hardware) such |
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| in some period. |
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| as |
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| Check refrigerant amount or any |
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| possibility case which may caused |
Note : Operation signal of the indoor unit shall be measured in the sending period as | high temperature or high pressure. | |||||||||||||||
picture below. |
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| Check operation signal of the indoor | |||
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| Sending signal of the indoor unit when have not return |
| unit by using diode. Measure voltage | ||||||||||||
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| VDC |
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| signal from the outdoor unit. |
| at terminal block of the indoor unit | ||||||||||
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| between No.2 and No.3 (or L2 and S) | |||
diode |
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| *** |
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60 |
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| If signal is varied | |
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apply |
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| replace inverter P.C. board. | |
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| If signal is not varied, replace indoor | |
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by |
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| P.C. board. |
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voltage |
| 3 minutes Delay, start |
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| 3 minutes stop |
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| * |
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| ** |
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| counting from power |
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signal |
| supply ON or remote |
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| Voltage variation stop |
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| OFF. |
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| output. |
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Measured |
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15 |
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| 0 |
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| 3 |
| 4 | 7 | 8 |
| Time (Min) |
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*Signal send only 1 minute and stop. Because of return signal from outdoor unit has not received. ** Signal resend again after 3 minutes stop. And the signal will send continuously.
*** 1 minute after resending, the indoor unit display flashes error.
– 72 –