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[
IX
Troubleshooting ]
2
When the remote controller op-
eration SW is turned on, a tem-
porary operation display is
indicated, and the display lights
out immediately.
1. The power is not supplied to the indoor unit.
The main power of the indoor unit (AC208/230V) is not on.
The connector on the indoor unit board has come off.
The fuse on the indoor unit board has melted.
Transformer failure and disconnected wire of the indoor unit
The indoor unit board failure
2. The heat source unit MAIN board failure
As the indoor unit does not interact with the heat source unit, the heat source
unit model cannot be recognized.
Check method and remedy
Phenomena
Cause
Check method and remedy
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
*1
*1
Check LED1 on the
indoor unit control board.
Is it lit?
When it is lit
When it is off
or cannot be checked
Check for the change of LED
display by operating dip
switch SW1 for self-diagnosis.
Check voltage of the power supply
terminal on the indoor unit.
AC208 / 230V?
Check the fuse on
the circuit board.
Melted?
Check 208/230V circuit for
short circuit and ground fault
Check the connection
of the connector.
Check the main power of
the power supply wire
Turn on the
power again.
Connector contact failure
Disconnected?
Check the resistance value
of the transformer
Within specification?
Check the cause of the
disconnected transformer.
Ground fault on the circuit board
Ground fault of the sensor and the LEV
Check self-diagnosis function
of heat source unit
Changed?
Changed?
Heat source unit board failure
Check self-diagnosis function of
heat source unit after the power on.
Accidental
error
Heat source unit
main board failure
Correct
the error.
*1. Refer to the service handbook for the indoor unit "Simple checking Procedures for individual components".
Содержание City Multi CMB-P1016NU-G
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Страница 312: ... 303 X LED Monitor Display on the Heat Source Unit Board 1 How to Read the LED on the Service Monitor 305 ...
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