Sinclair ASC-18A - Page 119

DC INVERTER U-MATCH AIR CONDITION MAINTENANCE
113
Malfunction display: F3 Failure of Outdoor Ambient Sensor
Check if the plug of the temperature sensor is
correctly connected with socket on the mainboard
Failure of outdoor
Ambient 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: 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