Mitsubishi MUY-A15NA, Service Manual

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50
MUZ-A09/12/15/17 MUY-A15/17
Check of LEV (Expansion valve)
L
Replace the LEV.
Expansion valve operates in
full-opening direction.
Is LEV properly fixed to the
expansion valve?
Ok
Do you hear the expansion
valve "click, click·······"?
Do you feel the expansion
valve vibrate on touching it ?
Does the resistance of LEV
have the characteristics?
(Refer to 10-4.)
Measure each voltage between connector pins
of CN724 on the inverter P.C. board.
1.Pin
3
(-) Pin
1
(+)
2.Pin
4
(-) Pin
1
(+)
3.Pin 5 (-) Pin 1 (+)
4.Pin 6 (-) Pin 1 (+)
Is there about 3~5V AC between each?
NOTE: Measure the voltage by an analog tester.
No
Yes
Yes
Yes
No
Replace the
expansion valve.
Yes
No
No
Properly fix the LEV to the
expansion valve.
Replace the
inverter P.C. board.
This figures show about MSZ-A09/12/15/17.
Turn ON the power supply.
<Preparation of the remote controller>
1 While pressing both OPERATION SELECT
button and TOO COOL button on the remote
controller at the same time, press RESET button.
2 First, release RESET button.
And release the other two buttons after all LCD
in operation display section of the remote
controller is displayed after 3 seconds.
Press OPERATE/STOP(ON/OFF) button of the remote
controller (the set temperature is displayed) with the
remote controller headed towards the indoor unit.
W
1
W
1. Regardless of normal or abnormal, a short
beep is emitted once as the signal is received.
Heating/Cooling does not work sufficiently.
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