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