The cooling operation or heating operation does not operate. (LED display: 00)
C Check of R. V. coil
•When heating operation does not work. Start
1.Disconnect the lead wire leading to the compressor.
2.Turn on power supply to the indoor and outdoor unit, three minutes later EMERGENCY OPERATION (HEAT operation) starts.
Is there voltage of 220V AC - 240V AC between No pin1 and pin 2 at connector CN913?
Yes
Turn off power supply of indoor and outdoor unit.
1. Turn off power supply of indoor and outdoor unit, and disconnect the connector (CN851, CN852) in the electronic control P. C. board.
2.Turn on power supply to the indoor and outdoor unit, three minutes later EMERGENCY OPERATION
(HEAT operation) starts.
Disconnect the connector CN913 in noise filter P. C. board, and measure the resistance of R. V. coil to check the integrity.
Yes
Replace the
No
Replace the R. V. coil
Is there voltage 12V DC between | No |
| Replace the electronic |
the connector CN852 pin 1 (+) |
| ||
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| control P. C. board. | |
and pin 5 |
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| |
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| |
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Yes
Replace the noise filter P. C. board.
•When cooling operation does not work. Start
1.Disconnect the lead wire leading to the compressor.
2.Turn on power supply to the indoor and outdoor unit, three minutes later EMERGENCY OPERATION (COOL operation) starts.
Is there voltage of 220V AC - 240V AC between No |
| ||||
Replace the | |||||
pin1 and pin 2 at connector CN913? |
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| |||||
| Yes |
| |||
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| ||||
1.Turn off power supply of indoor and outdoor unit, and disconnect the connector (CN851, CN852) in the electronic control P. C. board.
2.Turn on power supply to the indoor and outdoor unit, three minutes later EMERGENCY OPERATION
(COOL operation) starts.
Is there voltage 12V DC between the connector CN852 pin 1 (+) and CN851 pin 5
Yes
No
Replace the noise filter P. C. board.
W1 If the connector CN913 is not connected or R. V. coil is open, voltage occurs between terminals even when the control is OFF.
Replace the electronic control P. C. board.
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