Haier AB122ACERA Service Manual - Page 58

Commercial Air Conditioner Model: AU122AEERA AB122ACERA AC122ACERA AD122ALERA 3) Outdoor DC motor abnormal Alarm condition: outdoor DC motor is blocked rotor or broken, abnormal. outdoor indicator LED indicate DC motor abnormal Check if the outdoor unit fan blade is blocked by some objects no Check if the lead wire of DC motor is broken or short-connected yes yes adjust fan blade to make it run normally adjust lead wire of fan motor no 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 compressor can not startup after unit is switched on for 4 minutes, indoor failure indicator flashes 9 times yes if indoor unit alarms other failure codes eliminate other faults no check if wiring between indoor and no outdoor is correct, power supply is 50Hz yes no check if the indoor PCB worked normally adjust wiring and power supply, note not connect the outdoor connecting port 1/2 wrong check the indoor wires, confirm the normal operation of indoor PCB yes check if the failure is eliminated no Replace outdoor PCB 5) Compressor discharging temperature protection Alarm condition: Within one hour after compressor is running, compressor discharging temperature is over 115degree for 3 times continously. outdoor indicator indicate the above failure yes check if refrigerant is too much or too less adjust refrigerant no check if the system piping is blocked yes adjust piping no no check if discharging temp. sensor resistance is normal yes replace sensor replace PCB 58