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SM830078
12. SERVICE PROCEDURES
C. Check “Operation selector” switch in the indoor unit.
D. Check compressor motor protectors.
(a) High pressure switch (63PH)
E. Transformer in indoor unit.
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.
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.
• Check resistance of
transformer winding. (TR1)
1033_X_S