18
Check of outdoor thermistor
Measure
resistance
between CN 662
3
and
4
.
No
Yes
Replace the
thermistor.
Measure
resistance
between CN 662
1
and
2
.
Connect CN662.
Turn ON the power
supply and press
the EMERGENCY
OPERATION
switch.
Does the
resistances of
thermistor have
the characteristics
on 8-5.?
No
Yes
Does the unit operate
10 minutes or more?
Replace the deicer P.C.
board.
Ok
W
Turn OFF the
power supply.
Discharge temperature
thermistor(RT62)
Ambient temperature
thermistor(RT63)
W
Defective contact of the connector is considered.
w
Disconnect the connectors CN662 from the deicer P.C. board. (Check the characteristics of each thermistor.)
E
When OPERATION INDICATOR lamp flashes 6-time.
Thermistors in the outdoor unit are abnormal.
Check of LEV (Expansion valve)
D
With remote controller set toward the indoor unit, press
OPERATE/ STOP(ON/ OFF) button and confirm one beep tone.
LEV 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
on 8-3?
No
Yes
Yes
Yes
No
No
Properly fix LEV coil to
the expansion valve.
Replace the
deicer P.C. board.
NOTE
: After check of LEV, do the undermentioned operation.
1. Turn OFF the power supply and turn ON again.
2. Press the RESET button on the remote controller.
Replace the LEV.
Remote controller model : KP0B
Turn ON the power supply.
1
While pressing OPERATION
SELECT button on the remote
controller, press RESET button.
2
Release RESET button to confirm
if all LCD in operation display
section of the remote controller is
displayed.
3
Release OPERATION SELECT
button.
Remote controller model : KM04B
Turn ON the power supply.
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.
KP0B
KM04B
AMPM
CLOCK
˚C
AMPM
AMPM
CLOCK
˚C
AMPM
When OPERATION INDICATOR lamp flashes 10-time.
Cooling mode dose not operate.
MU-A30ND
MU-A30ND
OB405E.qxp 09.10.14 9:16 AM Page 18
