Haier HSU18VH7-W Service Manual - Page 13

Air conditioner Edition: 10070808 Table for Wrong Codes Wrong express power timing operating reasons Ways and means solutions tools ★ ■ ■ indoor ambient temperature sensor abnormal Check the sensor of indoor ambient temperature,if the resistance value is 0 or ∞,the sensor is abnormal. see the following flow chart 1 Multimeter ★ □ □ indoor pipe temperature sensor abnormal Check the sensor of indoor coilpipe ,if the resistance value is 0 or see the following flow chart 1 Multimeter ∞,the sensor is abnormal. ■ □ Indoor fan ★ motor don't feed back Check whether indoor PCB or motor is abnormal see the following flow chart 2 Multimeter ★ □ ★ Data error or no Check whether the EEPROM is EEPROM installed properly □on★flash■off Change the indoor PCB Multimeter chart 1: SENSOR MALFUNCTIONS Firstly check whether Terminal CN8 on the indoor mainboard contact well or not? YES NO Pull out the terminals on the indoor mainboard and reinsert them. Pull the sensor out of the mainboard 1) measure the value of resistance between its two jumpers 2)measure the temperature at the room temperature sensing head. Check the specifications of the sensor to decide whether the sensor is damaged or not? YES Replace with new sensor NO The Indoor PCB is broken YES Replace with new indoor PCB chart 2 Indoor fan motor malfunction Check whether Terminal CN2 on the indoor mainboard is well inserted or not? YES Pull out and reinsert the terminals. NO Electrify the machine again and turn it on in the Cool state with the remote controller. Measure the voltage between 1 and 4 of Terminal CN2 about DC150-380V,Measure the voltage between 5 and 4 of Terminal CN2 on the indoor mainboard about DC13-16.5V. Measure the voltage between 7 and 4 of Terminal CN2 about 1-6.5v NO the PCB of the indoor unit is damaged and needs replacing YES the motor of the indoor unit is damaged and needs replacing. - 11-