Fujitsu AO*G09KXCA Series, Service Instruction

Page: 61 / 110

02-28
Trouble shooting 24
OUTDOOR UNIT Error Method:
4-Way Valve Error
Detective Actuators:
Detective details:
Forecast of Cause :
OK OK
OK OK
Indoor unit Controller PCB
Heat Ex. temperature thermistor
Room temperature thermistor
4-way valve
When the indoor heat exchanger temperature is compared with
the room temperature, and either following condition is detected
continuously two times, the compressor stops.
1. Air filter clogged 2. Connector connection failure 3. Thermistor failure 4. Coil failure
5. 4-way valve failure 6. Controller PCB failure
Check Point 2 : 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 4 : Check the solenoid coil and 4-way valve
Remove CN30 from PCB and check the resistance value of coil.
Resistance value is 2.085 (at 20°C).
>> If it is Open or abnormal resistance value, replace Solenoid Coil.
Cooling or Dry operation
[Indoor heat exchanger temp.] - [Room temp.] > 10°C
Heating operation
[Indoor heat exchanger temp.] - [room temp.] < -10°C
If the same operation is repeated 5 times, the compressor stops permanently.
[ Solenoid coil ]
Check each piping temperature,
and the location of the valve by the temperature difference.
>> If the value location is not proper, replace 4-way valve.
[ 4-way valve ]
OK OK
Check Point 5 : Replace Controller PCB
If Check Point 1- 3 do not improve the symptom, replace Controller PCB.
Check Point 3 : Check each thermistor
Isn’t it fallen off the holder?
Is there a cable pinched?
>> Check characteristics of thermistor (Refer to Trouble shooting 7, 8),
If defective, replace the thermistor
OK OK
Check Point 1 : Check the Air filter condition
Check is Air filter dirty.
>>If the Air filter dirty, clean up the Air filter.
Indicate or Display:
Indoor Unit :
Operation indicator : 9 times Flash
Timer indicator : 9 times Flash
Error code : [ E : 99 ]
Economy indicator: Continuous Flash