AUX ASW-H09B5B4/FAR3DI-C3, Service Manual

Page: 32 / 101

29
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2
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E1- Indoor Unit temperature sensor error
Explanation of
error
Cause: The detection of short circuit or open circuit of Indoor Unit
temperature sensor during the inspection of main PCB in the Indoor
Unit machine, indicated by “Indoor Unit temperature sensor error”.
Inspection path:
Sensor→Sensor wire→Connectors→Indoor Unit
main PCB
Tools required
for inspection
Multimeter, 15KΩ standard sensor （
25
℃ ）
Frequent
problematic part
Indoor Unit temperature sensor, Indoor Unit main PCB
Inspection
procedure and
key points
1. Check whether there’s resistance problem, short circuit or open
circuit in the sensor; the resistance value shall be within a reasonable
range (15KΩ under the temperature of 25
℃
for frequency conversion
machine)
2. Check whether the sensor wire is broken.
3. Check whether the terminal connectors are well fixed; check
whether the weld between the terminal and the main PCB is loose, and
pull the terminal slightly for inspection if necessary.
4. Check whether the sensor is affected with damp.
5. In case no standard sensor is available at present, replace the Indoor
Unit temperature sensor by other sensor asides, and then check whether
the error still exists; if the error disappears, replace the sensor; if the
error still exists, check the Indoor Unit main PCB and change if
necessary.