22
YES
NO
SI
NO
NO
Has operation selector switch been set
to ON position?
Try to run using another remote contro
unit.
Refer to page 16
Neither indoor unit nor outdoor unit runs.
Check for residue duildup on transmitter
of remote control unit.
Check for residue buildup on remote
control receiver on front of indoor unit.
First remote control unit is defective.
Clean transmitter.
Clean receiver.
Set operation selector switch to ON.
The operation selector
switch is defective.
(3) Check “OPERATION selector” switch in indoor unit on monitor panel
(4) Check remote control unit.
AIR CONDITIONER OPERATES, BUT ABNORMALITIES ARE OBSERVED (HEAT PUMP MODEL)
1) Operation does not switch from heat to cool (or cool to heat)
Remote control unit may be defective.
Measure resistance of solenoid coil
winding (20 S - 4-way valve)
Receiver Ass’y may be defective.
Check voltage between terminals
No. 1 (+) and No. 3 at four poles
connector (DC 24 V) (unit connec-
tor).
Check voltage between terminals No. 1 (+) and No. 3 at four poles con-
nector (DC 24V) (unit connector) no voltage appears (0V).
Indoor controller ass’y is defective
(PCB1).
0 Volt
No voltage appears
24 VOLT
Defrost controller ass’y is defective
(PCB2)
2) CHECK PCB ASS’Y IN INDOOR UNIT (HEAT PUMP MODEL)
Switch operation from cool to heat (cool heat).
Switch operation from heat to cool (heat cool).
F
B
2
