The cooling operation or heating operation does not operate. (LED display: Both LED1 and LED2 lighting)
C Check of R.V. coil
•When heating operation does not work.
1.Disconnect the lead wire leading to the compressor.
2.3 minutes after turning on the power supply, start EMERGENCY OPERATION in HEAT mode.
Is there voltage of 230V AC between pin1 and | No |
pin 2 at connector CN912? W |
|
Yes |
|
Turn off power supply of indoor and outdoor unit.
1.Turn off power supply of indoor and outdoor unit, and disconnect the connector CN781 in the outdoor electronic control P.C. board.
2.3 minutes after turning on the power supply, start EMERGENCY OPERATION in HEAT mode.
Disconnect the connector CN912 in noise filter P. C. board. Is there normal resistance to R.V. coil?
Yes
Replace the
No
Replace the R.V. coil.
Is there voltage 12V DC
No
between the connector CN781 pin 5 (+) and pin 3
Yes
Replace the noise filter P.C. board.
Replace the electronic control P.C. board.
• When cooling operation does not work.
1.Disconnect the lead wire leading to the compressor.
2.3 minutes after turning on the power supply, start EMERGENCY OPERATION in COOL mode.
Is there voltage of 230V AC between pin1 and | No |
| |||
Replace the | |||||
pin 2 at connector CN912? W |
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| Yes |
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WIf the connector CN912 is not connected or R.V. coil is open, voltage occurs between terminals even when the control is OFF.
1.Turn off power supply of indoor and outdoor unit, and disconnect the connector CN781 in the outdoor electronic control P.C. board.
2.3 minutes after turning on the power supply, start EMERGENCY OPERATION in COOL mode.
Is there voltage 12V DC
No
between the connector CN781 
Replace the noise filter P.C. board. pin 5 (+) and pin 3
Yes
Replace the outdoor electronic control P.C. board.
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