9-2. Primary Judgement of Trouble Sources
9-2-1. Role of Indoor Unit Controller
The indoor unit controller receives the operation com- mands from the remote control and assumes the fol- lowing functions.
•Measurement of the draft air temperature of the indoor heat exchanger by using the thermo sen- sor (TA).
•Louver motor control
•Control of the indoor fan motor operation
•Control of the LED display
•Control of the outdoor unit compressor and the out- door fan motor.
The indoor unit of this machine observes the opera- tion condition of the air conditioner and displays the contents of the
| Table | |
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| Block display | Block display |
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A | OPERATION display flashing (1 Hz) | Power failure (when power is ON) |
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B | OPERATION display flashing (5 Hz) | Thermo sensor (TA) short/break |
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C | OPERATION display flashing (5 Hz) | Heat exchanger sensor (TC) short/break |
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D | OPERATION display flashing (5 Hz) | Indoor fan lock, abnormality of indoor fan |
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E | OPERATION display flashing (5 Hz) | Indoor PC board failure |
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F | OPERATION, TIMER and | • Gas shortage, other refrigerant cycle trouble |
| flashing (5 Hz) | • Heat exchanger sensor open/break/short |
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| • Overload relay trouble |
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(1)Judgement from defective operation or abnormal operation
Table
Symptom | Check |
| Primary judgement | |
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| |
No reaction on | Turn off the power once, turn it on | Remote control is | The indoor part (including the | |
remote control | again and try to operate the remote | not possible. | remote control) is defective. | |
operation | control again. |
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Remote control is | OK. | |||
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| |||
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| possible. |
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The outdoor fan | The compressor operates. |
| The outdoor part is defective. | |
does not rotate |
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| (outdoor fan motor) | |
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| |
| The compressor does not operate. |
| The inside part is defective. | |
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