Haier HSU-09H03/R(DB) [78/131] Humidity sensor or related abnormality

Haier HSU-09H03/R(DB) [78/131] Humidity sensor or related abnormality
7.4.2 Humidity sensor or Related Abnormality
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the humidity detected by the sensor are used to determine humidity sensor errors
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when the sensor input is more than 3V or less than 0.5V during compressor
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operation.
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The values 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.
Sensor output voltage check method:
Remove the connector of the sensor on the PCB, and measure the voltage of sensor using tester.The
relationship between normal temperature and output voltage is shown in the graph below.
Relative Humidity ˄%RH˅
Temp.
20 30 40 50 60 70 80 90
5ć
0.879V 1.375V 1.724V 2.012V 2.211V 2.385V 2.561V 2.754V
25ć
0.885V 1.383V 1.744V 2.011V 2.220V 2.412V 2.589V 2.771V
45ć
1.018V 1.470V 1.776V 2.013V 2.212V 2.398V 2.594V 2.814V
Check the connector connection.
Sensor output voltage check
Is it normal?
Yes
NO
Replace the sensor
Yes
Replace the indoor unit PCB
Is it normal?
NO
Correct the connection
tester
Demastic Air Conditioners
+6809,12H03/R(DB)
System Diagnosis
75

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