Mitsubishi Electric PQHY-P200YLM-A Service Handbook page 346

[ IX Troubleshooting ]
In case of ME remote controller
2. Phenomena
When the remote controller operation SW is turned on, a temporary operation display is indicated, and the display lights out
immediately.
(1) Cause
1) The power is not supplied to the indoor unit.
The main power of the indoor unit (AC220V) 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 control board failure
As the indoor unit does not interact with the heat source unit, the heat source unit model cannot be recognized.
(2) 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 SW1 for self-diagnosis.
HWE15060
Check voltage of the power supply
terminal on the indoor unit.
AC208/230V?
When it is off
Check the fuse on
or cannot be checked
the circuit board.
Melted?
Check the connection
of the connector.
Disconnected?
Check the resistance value
of the transformer
Within specification?
Check self-diagnosis function
of heat source unit
Changed?
Heat source unit board failure
*1. Refer to the parts catalog "transformer check".
NO
Check the main power of
the power supply wire
YES
YES
Check 200V circuit for
short circuit and ground fault
NO
YES
Connector contact failure
NO
*1
Check the cause of the
NO
disconnected transformer.
Ground fault on the circuit board
Ground fault of the sensor and the LEV
YES
NO
Check self-diagnosis function of
YES
heat source unit after the power on.
NO
Changed?
YES
Heat source unit control
Accidental
board failure
error
- 337 -
Turn on the
power again.
*1
Correct
the error.
GB