231
TROUBLESHOOTING
1) Check for disconnection of the connector.
2) Disconnect the connector and check electric continuity of the wiring.
NOTE) When replacing the refrigerant system parts, Refer to P221, [Technical Data When Replacing the Re-
frigerant System Parts].
55) Check Operation Condition
56) Check for Readings of the Indoor Temperature Sensors
1. Check each indoor temperature with the monitor mode of the board maintenance functions.
2. Measure actual temperature with a thermometer, and check for the sensor reading's extreme deviation from the
actual temperature.
3. Check each indoor temperature sensors' resistance value on the indoor PCB, and check for extreme deviation
from the standard value.
57) Check Indoor Air Intake Status
Check for a blockage at the indoor unit inlet, clogged air filter, and indoor fan motor operation.
2. Check motor coil resistance
1) Turn OFF the electric leakage breaker.
2) Measure the resistance between each coils.
※ When the electronic expansion valve is 5 cores
(without brown), substitute red core for brown
core.
3. Check electric continuity of the connector and
wiring.
Standard resistance value
Blue-Brown
46 ± 4 Ω
Brown-Yellow
Orange-Red
Red-White
Blue-Yellow
92 ± 8 Ω
Orange-White
Measure the temperature difference between indoor intake
air and indoor discharge air.
NOTE) The values are only for reference, as they vary
depending on the ambient conditions or between the
individual units.
Indoor unit temperature difference
(Intake - Discharge)
In cooling ⊿ T = 18 ~ 27 ℉ (10 ~ 15 ℃ )
In heating ⊿ T = 27 ~ 36 ℉ (15 ~ 20 ℃ )
Code No. Temperature Standard resistance value
Indoor heat exchanger vapor pipe temperature No. Fc 14 ℉ (-10 ℃ ) 112.0 kΩ
Indoor heat exchanger liquid pipe temperature No. Fd 32 ℉ (0 ℃ ) 65.8 kΩ
Indoor intake air temperature sensor No. FE 50 ℉ (10 ℃ ) 40.0 kΩ
68 ℉ (20 ℃ ) 25.0 kΩ
Measure point (on indoor control PCB) 86 ℉ (30 ℃ ) 16.1 kΩ
Indoor heat exchanger vapor pipe temperature X11A 104 ℉ (40 ℃ ) 10.6 kΩ
Indoor heat exchanger liquid pipe temperature X12A 122 ℉ (50 ℃ ) 7.2 kΩ
Indoor intake air temperature sensor X13A
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