Mitsubishi Electric MSZ-A09RV Service Manual page 53

O
Check of rush current limiting circuit
Outdoor unit does not operate or stops immediately due to overcurrent.
Start
Does current limiting resistor detect 10"?
Yes
Ok
P
Check of linear expansion valve (LEV)
Heating/Cooling do not operate.
After you have followed the entire flow chart of "Check of linear expansion valve (LEV)", be sure to follow the procedure below.
1Press EMERGENCY OPERATION switch.
2Unplug the power cord and then plug it again.
3Press RESET button on remote controller.
• Press RESET button, while pressing OPERATION SELECT button on remote controller.
(All displays on operational display section are ON.)
• With remote controller set toward the indoor unit, press OPERATE/STOP(ON/OFF)
button and confirm one beep tone.
• With remote controller set toward the indoor unit, OPERATE/STOP(ON/OFF) button and
confirm two beep tones.
LEV operates in full-opening
direction.
Do you hear LEV "click,
click·······"?
Do you touch LEV and
feel it vibrate?
No
· Is LEV connector connected?
· Is LEV coil properly fixed to the body?
Yes
LEV coil
Does the resistance of
have the characteristics?
No
Replace LEV.
Characteristics of LEV coil
(coil defect)
LEV (CN 724)
WHT(6)–RED(1)
RED(1)–ORE(4)
YLW(5)–BRN(2)
BRN(2)–BLU(3)
NOTE : When the current limiting resistor is open, the rush current limiting relay
may not be working properly. There fore confirm the limiting resistor
works properly after replacing it.
No ∞
Replace current limiting resistor.
Yes
Ok
No
Yes
Replace outdoor
electronic control P.C.
board.
resistance
39"~56"
53
· Re-connect the connector.
· Properly fix LEV coil to the body.
Confirm again
that LEV is
operating.
Yes
Yes
Do you hear LEV
"click, click·········"?
No
Replace LEV.
Ok