•When OPERATION INDICATOR lamp flashes
•When thermistor is abnormal.
B Check of outdoor thermistors
Disconnect the connector in the outdoor electronic control P.C. board or the outdoor power board | No |
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Replace the thermistor. | |||||
(see below table), and measure the resistance of thermistor. Is the thermistor normal? |
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| Yes |
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Reconnect the connector CN661, CN663 and CN3.
3 minutes after turning on the power supply, start EMERGENCY OPERATION.
Does the unit operate 10 minutes or more without | No |
showing thermistor abnormality? |
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Yes |
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Normal |
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Replace the outdoor electronic control P.C. board.
Thermistor | Symbol | Connector, Pin No. | Board | |
Defrost | RT61 | Between CN661 pin1 and pin2 |
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Discharge temperature | RT62 | Between CN661 pin3 and pin4 | Outdoor electronic control P.C. board | |
Outdoor heat exchanger temperature | RT68 | Between CN661 pin7 and pin8 | ||
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Ambient temperature | RT65 | Between CN663 pin1 and pin2 |
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Fin temperature | RT64 | Between CN3 pin1 and pin2 | Outdoor power board |
25