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Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button
and TOO COOL button on the remote controller at the
same time, press RESET button.
First, release RESET button.
Hold down the other 2 buttons for another 3 seconds.
Make sure that the indicators on the LCD screen
lease the buttons.
Press STOP/OPERATE (OFF/ON) button of the remote
controller (the set temperature is displayed) with the
remote controller headed towards the indoor unit. 1
Expansion valve operates in full-opening direction.
Do you hear the expansion valve "click,
Do you feel the expansion valve vibrates
when touching it ?
No
the expansion valve?
Yes
Does the resistance of LEV
coil have the characteristics?
(Refer to 10-4.)
No
Replace the LEV coil.
NOTE: After check of LEV, take the following action.
1. Turn OFF the power supply and turn it ON again.
2. Press RESET button on the remote controller.
OBH733G
-
OK
Yes
No
Measure each voltage between connector
pins of CN724 on the inverter P.C. board.
1. Pin (-) — Pin (+)
2. Pin (-) — Pin (+)
3. Pin (-) — Pin (+)
Yes
4. Pin (-) — Pin (+)
Is there about 3 - 5 V AC between each?
NOTE: Measure the voltage by an analog
tester.
Replace the expansion valve.
MSZ-GL06/09/12/15NA
MSZ-GL18NA
MSY-GL18NA
MSY-GL09/12/15NA
1. Regardless of normal or abnormal condition, a short beep
is emitted once the signal is received.
Yes
55
MSZ-GL24NA
MSY-GL24NA
Replace the inverter P.C.
No
board.
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