Outdoor unit does not operate. (LED display: display OFF)
A Check of power supply
Start
Check the connecting of main circuit parts and connector (CN501: I.P.M P. C. board,
CN 801: Electronic control P. C. board, CN554: relay P. C. board)
Turn on power supply |
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Is there voltage of 220V AC - 240V AC | No | ||
in the power supply terminal block? |
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| Yes |
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Is there voltage of 310V DC - 340V DC | No | ||
across the smoothing capacity? |
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| Yes |
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Replace the electronic control P. C. board.
Check the power supply cable.
Is there voltage of 220V AC - 240V AC across the output cable (LD63, LD64) in the noise filter P. C. board?
Yes
Is there voltage of 220V AC - 240V AC across the input terminal part in the diode module (DS61)?
Yes
No
No
Replace the noise filter P. C. board
Replace the current limiting resistor.
w When replacing, check the |
connection of connector |
CN720 in the outdoor |
Check the main circuit parts and replace it.
Outdoor unit does not operate. (LED display: 00)
electronic control P. C. |
board |
B Check of serial signal
Start
1.Check the indoor unit with referring to the indoor unit service manual
2.Turn off the power supply of the indoor and outdoor unit and return the indoor/ outdoor unit connecting wire to former original.
3.Check the connection of indoor/ outdoor unit connecting wire in the outdoor unit terminal block, and check the connection of the connector (CN601: unit A, CN 602: unit B, CN603: unit C, CN604: unit D) in the electronic control P. C. board
4.Disconnect the lead wire to the compressor. Turn on the power supply (indoor/ outdoor unit) 3 minutes later, EMERGENCY OPERATION starts.
Is there voltage of 5V DC - 10V DC between | No |
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Replace the electronic control P. C. board. | |||||
No. 3 (+) and N |
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| Yes |
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Recheck a connected circumstance of the indoor/ outdoor unit connecting wire.
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