Fujitsu Inverter Halcyon ASU12RMLQ, Service Instruction

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Trouble shooting 5
OUTDOOR UNIT Error Method:
Indicate or Display:
Refer to error code table.
Detective Actuators:
Detective details:
Forecast of Cause :
Check Point 2 :
Check Point 3 :
4.89
77°F
(25°C)
6.10
68°F
(20°C)
7.67 9.73 12.4 16.1 20.9 27.5 Resistance Value (k )
59°F
(15°C) 50°F
(10°C) 41°F
(5°C) 32°F
(0°C) 23°F
(-5°C) 14°F
(-10°C) Temperature
OK OK
OK OK
DC
3.95
86°F
(30°C)
THERMISTOR (DISCHARGE)
THERMISTOR (PIPE) THERMISTOR (OUTDOOR) THERMISTOR (COMPRESSOR) THERMISTOR (HEAT SINK)
BROWN BLACK BLACK BLUE BROWN
CN25 CN26 CN23 CN22 CN21
1 2 1 2 1 2 1 2 1 2
Outdoor Heat Exchanger Temperature
Thermistor Error
Outdoor Unit Main PCB Circuit
Heat Exchanger Temperature Thermistor
When Heat Exchanger Temperature Thermistor 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 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.
02-12