93
U-MATCH Air
Conditioners
Service Manual
Malfunction display: F4 Failure of Exhaust Temp. Sensor
Check if the plug of the temperature sensor is correctly
connected with socket on the mainboard
Failure of Exhaust Temp.
sensor
N
Remove the sensor to check if the resistance
value is ok
N
Y
Y
Y
Replace mainboard of the
indoor uint
Check the direction of the
plug and socket
Replace temperature sensor
Malfunction display: F5 Failure of Indoor Room Sensor at Wire Controller
Failure of indoor room sensor
at Wired Controller
Replace Wired Controller
of the indoor uint
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