Mitsubishi Electric MUZ-GE25VA-a1 Service Manual page 77

K Check of LEV (Expansion valve)
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button
and TOO COOL button (MSZ-GE25/33/35/42/50)/
TEMP button (MSZ-GE60/71/80VA) on the remote
controller at the same time, press RESET button.
First, release RESET button.
Hold down the other two buttons for another 3 sec-
onds. Make sure that the indicators on the LCD
screen shown in the right fi gure are all displayed.
Then release the buttons.
Press OPERATE/STOP (ON/OFF) 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,
click·······"?
Do you feel the expansion valve vibrate
on touching it ?
No
Is LEV coil properly fi xed to
the expansion valve?
Yes
Does the resistance of LEV
coil have the characteristics?
(Refer to 11-4.)
No
Replace the LEV coil.
NOTE: After check of LEV, do the undermentioned operations.
1. Turn OFF the power supply and turn it ON again.
2. Press RESET button on the remote controller.
OBH532E
MSZ-GE25/33/35/42/50VA
MSZ-GE35/50VA2
MSZ-GE25/35/42/50VAD
OK
Yes
Properly fi x the LEV coil to the expansion valve.
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 VAC between each?
NOTE: Measure the voltage with an analog
tester.
Replace the expansion valve.
MSZ-GE60/71/80VA
MSZ-GE80VA2
1. Regardless of normal or abnormal
condition, a short beep is emitted once
the signal is received.
Yes
77
MSZ-GE60/71/80VAD
Replace the inverter P.C.
No board.