SM830044
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4
4. Service procedures
4. Service procedures
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)
0618_X_S
• Check high pressure switch.
Does high pressure switch
actuate ? (63PH)
YES
YES
Clean heat exchanger coil
or remove obstacles.
• Is outdoor heat exchanger
coil dirty or are there
obstacles 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 2P (WHT) connector.
Check the continuity between No.1 and No.2 poles
of the socket.
0617_X_S
• Has “Operation selector”
switch been set to ON
position ?
YES
Set “Operation selector”
switch to ON.
NO
But 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.
0619_X_S
• Check compressor motor
overcurrent relay. (51C)
Does it actuate ?
YES
NO
YES
Consult power supply company
and restore voltage to
normal value.
• Check power supply voltage.
Is voltage 90% or less of
rated voltage ?
• Following causes may be considered.
Locked rotor of compressor.
Overcharged refrigerant.
Air shortage of outdoor unit ventilation.
Obstacles in front of outdoor unit.
NO
Refer to “CHECKING ELECTRICAL COMPONENTS
(Electro magnetic contactor)”.
90% or more of
rated voltage.
Summary of Contents for 854 012 22
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