Commercial Air Conditioner
Model: AU122AEERA AB122ACERA
AC122ACERA AD122ALERA
no
yes
Alarm condition: outdoor DC motor is blocked rotor or broken, abnormal.
outdoor indicator LED indicate DC motor abnormal
3) Outdoor DC motor abnormal
adjust fan blade to make it run normally
adjust lead wire of fan motor
yes
no
Check if the lead wire of DC motor
is broken or short-connected
Check if the outdoor unit fan
blade is blocked by some objects
Replace motor
Warning: For outdoor DC fan motor, forbidden to pull off the plug when being electrified.
4) Communication error between indoor and outdoor units
indoor unit troubleshooting
no
check if the failure is eliminated
yes
compressor can not startup after unit is switched on
for 4 minutes, indoor failure indicator flashes 9 times
no
check if wiring between indoor and
outdoor is correct, power supply is 50Hz
if indoor unit alarms other failure codes
check if the indoor PCB worked normally
yes
eliminate other faults
adjust wiring and power supply,
note not connect the outdoor
connecting port 1/2 wrong
Replace outdoor PCB
no
no
check the indoor wires, confirm the
normal operation of indoor PCB
yes
5) Compressor discharging temperature protection
Alarm condition: Within one hour after compressor is running, compressor discharging temperature is
over 115degree for 3 times continously.
adjust piping
no
no
replace sensor
yes
replace PCB
yes
no
check if discharging temp. sensor resistance is normal
check if refrigerant is too much or too less
check if the system piping is blocked
adjust refrigerant
yes
outdoor indicator indicate the above failure
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