Haier HSU-09RS03/R2(SDB) Service Manual page 60

Communication wiring disconnected
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or
1) Check whether Terminal CN23 and CN22 on the outdoor
mainboard CN10 and CN11 on IPM module
2) Check whether the connected wire between IPM and outdoor
Are they good?
Electrify the machine again and
turn it on, Check whether the
voltage between 1 and 2 of
Terminal CN22is about DC5V,
Check whether
between2 and 3 of Terminal CN22
is about DC15V,
7.4.5 Thermistor or Related Abnormality(outdoor unit)
Frost-removing temperature sensor failure
Indoor display:
outdoor display:
Exhaust temperature sensor failure
Indoor display:
outdoor display:
Ambient temperature sensor failure
Indoor display:
outdoor display:
Method of This type of error is detected by checking the thermistor input voltage to the microcomputer.
Malfunction (A thermistor error is detected by checking the temperature)
HSU-09/12RS03/R2(SDB)
else parts damage may be occurred.
NO
YES
the voltage
NO
NO
F21
LED1 flash 10 times:
F25
LED1 flash 13 times:
F6
LED1 flash 12 times:
1) Pull out and reinsert the terminals.
2) Replace connected wire
YES
Replace the outdoor IPM
module with a new one.
Replace the outdoor mainboard with a new one
57
Service Diagnosis
Domestic air conditioner