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The Lcd Momentarily Lights Up And Then Goes Off - Mitsubishi Electric PURY-HP72 Service Handbook

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[8-2 ME remote Controller Problems ]
8-2-2

The LCD Momentarily Lights Up and Then Goes Off.

1. Phenomena
When the remote controller operation SW is turned on, a temporary operation display is indicated, and the display lights out
immediately.
2. Cause
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 outdoor control board failure
As the indoor unit does not interact with the outdoor unit, the outdoor unit model cannot be recognized.
3. Check method and remedy
Check LED1 on the
indoor unit control board.
Is it lit?
When it is lit
Check for the change of LED
display by operating dip
switch for self-diagnosis.
HWE13080
Check voltage of the power supply
terminal on the indoor unit.
AC208/230V?
YES
When it is off
Check the fuse on
or cannot be checked
the circuit board.
Melted?
NO
Check the connection
of the connector.
Disconnected?
NO
Check the resistance value
of the transformer
Within specification?
YES
Check self-diagnosis function
of outdoor unit
Changed?
YES
Outdoor unit board failure
*1. Refer to the parts catalog "transformer check".
NO
Check the main power of
the power supply wire
YES
Check 200V circuit for
short circuit and ground fault
YES
Connector contact failure
*1
Check the cause of the
NO
disconnected transformer.
Ground fault on the circuit board
Ground fault of the sensor and the LEV
NO
Check self-diagnosis function of
outdoor unit after the power on.
NO
Changed?
YES
Indoor unit control
Accidental
board failure
error
- 256 -
Turn on the
power again.
*1
Correct
the error.
GB

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