Mitsubishi Electric SLH Series Technical & Service Manual page 57

From the preceding page.
Blinking
Phenomenon
frequency
3 Freezing protection is
blinking working.
5 Malfunction of outdoor unit
blinking (in case of using PUMY
series outdoor unit)
6 Outdoor thermistor
blinking
9 Malfunction of drain pump
blinking
(2) Other case
Phenomenon
Not working of remote
controller switch ON/OFF
Working the Indoor units
and not working the outdoor
units.
Not rotating the fan in the
indoor unit.
Horizontal vane doesn't work.
Cause
1) Short cycle of air cycle
2) Dirty air filter
3) Damaged fan
4) Abnormal refrigerant
Malfunction of outdoor unit
Mis-connecting of the outdoor
thermistor.
Trouble of the outdoor thermistor.
Trouble of the Indoor controller
board.
1) Malfunction of drain pump
2) Damaged drain sensor
Cause
A connector attaching the panel to the body
is not connected.
Short circuit the protecting parts in the
Indoor P.C. board.
Trouble of the Indoor P.C. board.
Trouble of the remote controller.
Wiring between the indoor and outdoor is
coming off.
Difference of wiring polarity between the
indoor and outdoor.
Trouble of the deicer P.C. board.
Trouble of the contactor (52C).
Trouble of the compressor (MC) and
outdoor fan motor (MF).
Fan motor connector is coming off.
Trouble of the Indoor controller board.
Trouble of the fan motor.
A connector attaching the panel to the body
is not connected.
Fixing of horizontal vane.
57
Countermeasure
1) Clear obstructions from air cycle.
2) Clean the air filter
3) Check the fan
4) Check the refrigerant temperature.
Check the display (7-SEG LED) on the PCB of
outdoor unit.
Refer to the TECHNICAL & SERVICE MANUAL
of outdoor unit.
Reinsert the connector (CN661).
Check the resistance value of the thermistor.
Exchange the Indoor controller board.
1) Check the drain pump.
2) Check the drain sensor.
(Check the drop of water is on.)
If the resistance is normal, replace the indoor
controller board.
Countermeasure
Connect it.
Check the varistor (ZNR1) and fuse (FUSE) out in
the Indoor controller board.
Check the Indoor P.C. board out.
Exchange the remote controller.
Check the wiring out between the indoor and
outdoor.
Check the deicer P.C. board out.
Exchange the contactor.
Check the compressor and fan motor out.
Check the connector out.
Check the fan motor output of the Indoor controller
board.
Check the resistance value between the each tap
of fan motor.
Connect it.
Check if the connector for vane motor is connected.