Fujitsu AB F18LAT Series Service Instruction page 39

Trouble shooting 5
OUTDOOR UNIT Error Method:
Outdoor Heat Exchanger Temperature
Sensor (Outlet) Error
Detective Actuators:
Outdoor Unit Main PCB Circuit
Heat Exchanger Temperature
Thermistor (Outlet)
Forecast of Cause :
1. Connector connection failure 2.Thermistor failure 3. Main PCB failure
Check Point 1 : Check connection of Connector
Check if connector is removed.
Check erroneous connection.
Check if thermistor cable is open.
>>Upon correcting the removed connector or mis-wiring, reset the power.
OK OK
Check Point 2 : Remove connector and check Thermistor resistance value Check Point 2 :
Thermistor Characteristics (Approx. value)
Temperature
Resistance Value (k )
Temperature
Resistance Value (k )
If Thermistor is either open or shorted, replace it and reset the power.
OK OK
Check Point 3 :
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)
3 2 1
3 2 1
CN70
If the voltage does not appear, replace Main PCB.
Indicate or Display:
Outdoor Unit : LED 0.1sec ON/ 0.1sec OFF
ERROR CODE : E : 06
Detective details:
When Heat Exchanger Temperature Thermistor (Outlet) open or
short-circuit is detected at power ON or while running the compressor.
-10°C -5°C 0°C
27.8 21.0 16.1
35°C 40°C 45°C
3.11 2.53 2.08
2 1 2 1 4 3 2 1
2 1 2 1 4 3 2 1
CN72 CN73 CN71
5°C 10°C 15°C 20°C
12.4 9.63 7.56 5.98
50°C 60°C 70°C 80°C
1.71 1.19 0.840 0.606
02-08
25°C 30°C
4.77 3.84
90°C 100°C
0.446 0.333
DC