39
(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
contact power company.
Replace it with suitable one.
(larger capacity).
NO
Outdoor unit
AE522SH
AE522SH3-AER522SH3 only
Measure coil resistance of
magnetic contactor. (MG or
52C)
In case of Heating
operation:
Measure resistance of 4-way
valve’s winding. (20S or SC).
OK
NO
YES
OK
Measure resistance of outdoor fan
motor winding.
Measure resistance of outdoor fan
motor winding.
Check capacity of circuit breaker.
Capacity of circuit breaker is
suitable?
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 it
is installed upside - down?
Replace limit float switch.
Check drain hose.
YES
NO
NO
Reposition the indoor unit.
YES
