Daikin J Series Service Manual Page 218

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SiE18-201 Troubleshooting - SkyAir Indoor Unit
Service Diagnosis 207
2.6.6 Malfunction of Heat Exchange Temperature Sensor System
Remote
Controller
Display
C4
Applicable
Models
All indoor unit models
Method of
Malfunction
Detection
Malfunction detection is carried out by temperature detected by heat exchanger sensor.
Malfunction
Decision
Conditions
When the heat exchanger thermistor becomes disconnected or short-circuited while the unit is
running.
Supposed
Causes
Failure of the sensor itself
Broken or disconnected wire
Failure of electronic circuitry (indoor unit PC board)
Failure of connector contact
Troubleshooting
Note:
Measure the resistance while referring to the thermistor temperature and resistance conversion table.
Thermistor temperature and resistance conversion table.
Disconnect the heat exchange
sensor (R2T) from X18A on
the indoor unit PC board and
measure the resistance.
Heat exchanger senser
replacement
If contact is OK, replace
outdoor unit PC board.
Is the thermistor
normal?
(See note)
(MF016)
NO
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Temperature Suction, heat exchanger(indoor)
outdoor air, outdoor unit suction
pipe sensor (k)
Temperature Suction, heat exchanger(indoor)
outdoor air, outdoor unit suction
pipe sensor (k)
-6.0 90.8 28.0 17.6
-4.0 81.7 30.0 16.2
-2.0 73.5 32.0 14.8
0.0 66.3 34.0 13.6
2.0 59.8 36.0 12.5
4.0 54.1 38.0 11.5
6.0 48.9 40.0 10.6
8.0 44.3 42.0 9.8
10.0 40.2 44.0 9.1
12.0 36.5 46.0 8.4
14.0 33.2 48.0 7.8
16.0 30.2 50.0 7.2
18.0 27.5 52.0 6.9
20.0 25.1 54.0 6.2
22.0 23.0 56.0 5.7
24.0 21.0 58.0 5.3
26.0 19.2
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