
Outdoor Unit controller failure diagnosis circuit diagram
FDCVA151~251 type
● Outdoor unit check points Check items with the *mark when the power is ON.
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❇ | Power Supply Check |
| Noise Filter Check: |
| DC | Reactor Continuity | Power |
| transistor module | |||||
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| Measure the power supply at L.N. | There should be continuity. |
| Check: 50 mΩ or higher, | check: Is there a short cir- | |||||||||
| (It is normal if it is AC 220/240V.) | There should be no shorts between phases. | less than 100 mΩ. | cuit, open circuit or dam- | ||||||||||
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| age? (See 160 page for the | |||
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| check procedure.) | |||
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| TB | F5 | (20A) |
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| Orange |
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| L |
| Red |
| T21 |
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| T24 |
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| CM |
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| N |
| White |
| T22 |
| Gray | To indoor unit |
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| T25 |
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| E |
| Y/NG |
| Sub PCB | Brown |
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| (Noise filter) | T26 |
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| Red | White |
| Black | |||
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| TB |
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| T30 |
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| Fuse Check: There should be | CNI1 | T28 | T27 |
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| U | V |
| W | ||||
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| continuity. |
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| Orange | Yellow |
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| T6 | T7 | T8 | ||||
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| CNI2 CNI3 | T2 | T4 |
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| Power transistor module | ||||
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| T1 | T5 |
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Power transistor thermistor temperature and | |||||||||
resistance characteristics check |
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| 80˚C] | ||||||
80˚C] | 100 |
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| 10 | |
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> = |
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[T |
| T | 80˚C |
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(kΩ) |
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| T >80˚C |
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resistance |
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| resistance | ||
50 |
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| 5 | ||
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Thermistor | 0 | 20 |
| 50 | 80 | 100 | 120 | 0 | Thermistor |
| 0 |
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| Temperature [ T ] (˚C) |
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CnTR
F2 (250V 20A)
Control PCB
F3 (250V 1A)
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| DC280V |
1 | 2 | 3 | 4 | 6 |
| When the outdoor | |
FM0 | unit fan motor is | |
abnormal: | ||
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| (Refer to page 157) |
LED1
Red
LED1 (Red) Check |
| Fuse Check: There should be continuity. |
Light continuously | : Normal | If faulty, replace the control PCB. |
Keeps flashing : | EEV |
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1~3 time flash : | Refer to 131 page |
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