Haier HSU-09H03/R(DB) Сервис мануал онлайн [84/131] 613257

Haier HSU-09H03/R(DB) Сервис мануал онлайн [84/131] 613257
7.4.6 Thermistor or Related Abnormality(outdoor unit)
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This type of error is detected by checking the thermistor input voltage to the microcomputer.
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(A thermistor error is detected by checking the temperature)
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The thermistor input is above 4.9V or below 0.1V with the power on.
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The values may vary slightly in some models
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Faulty connector connection
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Faulty thermistor
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Faulty PCB
Troubleshooting
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Be sure to turn off power switch before connect or disconnect connector, or
else parts damage may be occurred.
Thermistor resistance check method:
Remove the connectors of the thermistors on the PCB, and measure the resistance of thermistors using
tester.The relationship between normal temperature and resistance is shown in the value of outdoor
thermistor.
notes:
F6:
Ambient temperature sensor failure
F7:
Suction temperature sensor failure
F21:
Frost-removing temperature sensor failure
F25: Exhaust temperature sensor failure
Check the connector connection.
Thermistor resistance check
Is it normal?
Yes
NO
Replace the thermistor
Yes
Replace the outdoor unit PCB
Is it normal?
NO
Correct the connection
Demastic Air Conditioners
+6809,12H03/R(DB)
System Diagnosis
81

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