Haier AU60NFIERA Installation Instructions - Page 68

8. Suction temperature protection Measure if the actual air return temperature is over 40degree yes no Check the suction temperature Check the system: if the stop valve is normal; if EEV works normally; if the system is lack of refrigerant; if the system is clogged or leaks 9. Communication with power module failure Check if PCB is electrified with the power module no Check if the wiring between them is normal yes Check if the sequence of A and B is correct 10.Failure code from 24 to 27, from 30 to 40 Re-electrified, check if the failure disappears no Replace power module 11. Failure code 28 and 29: Check if the voltage input is in the range of 380V± 15%. Then check if the wiring connection is proper, such as if the terminal of power module is inserted firmly, PTC control wire is normal. 68