Fujitsu AOU18RLXFW - Page 36

Trouble shooting 13
OUTDOOR UNIT Error Method:
Indicate or Display:
Detective Actuators: Detective details:
Forecast of Cause :
OKOK
OKOK
3.924.87
15
6.097.679.7416.120.827.3Resistance value (k )
100-5-10Temperature (°C )
20
3025
Heat Ex. Liquid Outlet Thermistor Error
Outdoor Unit Main PCB
Heat Exchanger Temperature Thermistor
When Heat Exchanger Temperature Thermistor (Out) open or
short-circuit is detected at power ON or while running the compressor.
1. Connector connection failure 2. Thermistor failure 3. Main PCB failure
Check Point 1 : Check connection of connector
Check if connector is removed.
Check if connector is erroneous connection.
Check if thermistor cable is open.
>> Upon correcting the removed connector or mis-wiring, reset the power.
Check Point 2 : Remove connector and check thermistor resistance value
Thermistor characteristics (Approx. value)
If Thermistor is either open or shorted, replace it and reset the power.
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V)
If the voltage does not appear, replace Main PCB.
02-15
Refer to error code table.
BLACK
BLACK
BROWN
BROWN
BROWN
BROWN
BLUE
BLUE
CN64
CN62
CN65
CN63
1 2 3 1 2 3
1 2 3 1 2 3
1 2 3 1 2 3 1 2 3 1 2 3
THERMISTOR
( DISCHARGE PIPE )
THERMISTOR
( HEAT EXCHANGER )
THERMISTOR
( OUTDOOR TEMP. )
THERMISTOR
( COMPRESSOR TEMP. )
3.17
35
12.6
5
Temperature (°F ) 14 23 32 41 50 59  68 77 86 95