36
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.
OK
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.
1. Regardless of normal or abnormal condition, a short beep
is emitted once the signal is received.
Measure each voltage between connector
pins of CN724 on the inverter P.C. board.
1. Pin (-) — Pin (+)
2. Pin (-) — Pin (+)
3. Pin (-) — Pin (+)
4. Pin (-) — Pin (+)
Is there about 3 - 5 VAC between each?
NOTE:
Measure the voltage by an analog
tester.
Properly
fi
x the LEV coil to the expansion valve.
Replace the inverter P.C.
board.
Replace the LEV coil.
Replace the expansion valve.
Is LEV coil properly
fi
xed to
the expansion valve?
Does the resistance of LEV
coil have the characteristics?
(Refer to 10-4.)
Do you hear the expansion valve "click,
click·······"?
Do you feel the expansion valve vibrate
when touching it ?
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button
and TEMP 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
shown in the right
fi
gure are all displayed. Then re-
lease the buttons.
Yes
No
No
Yes
No
Yes
No
Yes
K Check of LEV (Expansion valve)
OBH753A
