– IV-5 –
C.
Check “Operation selector” switch in the indoor unit.
: In case of wireless remote control unit (GS type)
D.
Check compressor motor protectors.
a)
High pressure switch (63PH)
b)
Compressor motor overcurrent relay (51C)
• Check high pressure switch.
Is high pressure switch
actuated ? (63PH)
YES
YES
Clean heat exchanger coil
or remove obstructions.
• Is outdoor heat exchanger
coil dirty or are there
obstruction near air suction
inlet of outdoor unit ?
• Check if outdoor fan rotates.
Refer to “Only outdoor fan
does not run.”
NO
Disconnect the socket from the 2P (WHT) connector.
Check the continuity between the No.1 and No.2 poles
of the socket.
• Has “Operation selector”
switch been set to ON
position ?
YES
Set “Operation selector”
switch to ON.
NO
Neither unit runs.
Switch Ass’y or P.C.B.
Ass’y in the indoor unit
is defective.
IND. LAMP Ass’y or P.C.B.
Ass’y in the indoor unit
is defective.
• Check compressor motor
overcurrent relay. (51C)
Is it actuated ?
YES
NO
YES
Consult power supply company
and restore voltage to
normal value.
• Check power supply voltage.
Is voltage 90% of rated
voltage or less?
• Following causes may be considered.
Locked rotor of compressor.
Overcharged refrigerant.
Insufficient air for outdoor unit ventilation.
Obstruction in front of outdoor unit.
NO
Refer to “CHECKING ELECTRICAL COMPONENTS
(Electro magnetic contactor)”.
90% of rated
voltage or more.
