40
(b) Circuit breaker trips in several minutes after turning air conditioner ON.
• There is a possibility of short circuit.
(c) Neither indoor unit nor outdoor unit runs
Leds of remote control unit are light
Check power supply.
Is power being supplied to wall
receptacle?
Circuit breaker is
tripped.
Power failure.
Reset the breaker.
Wait for recovery or con-
tact power company.
Replace it with suitable one.
(larger capacity).
NO
Outdoor unit
AE518SC3
Measure coil resistance of
magnetic contactor. (MG or
52C)
OK
NO
YES
OK
Measure resistance of compressor
motor winding.
Measure resistance of outdoor fan
motor winding.
Check capacity of circuit breaker.
Capacity of circuit breaker is suita-
ble?
NO
Check is drain flow prevented?
YES
Check if the drain pump is working.
Measure resistance of drain pump
motor winding.
Replace drain pump.
Check function of limit float switch.
Float in high position: open circuit.
Float in down position: short circuit.
(Normal condition)
YES
Check installation of indoor unit is
it installed upside - down?
Replace limit float switch.
Check drain hose.
YES
NO
NO
Reposition the indoor unit.
YES
AER518SCL3ONLY
