Fujitsu ARC90LHTA User Manual

Detective Actuators:
Detective details:
Forecast of Cause :
OKOK
OKOK
1. Connector connection failure 2. Thermistor failure 3. Solenoid Coil failure
4. 4-way valve failure 5. 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 3 : Check the solenoid coil and 4-way valve
02-21
[ Solenoid coil ]
Remove CN105 from PCB and check the resistance value of coil.
Resistance value is about 1.5k
>> If it is Open or abnormal resistance value, replace Solenoid Coil.
[ 4-way valve ]
Check each piping temperature, and confirm the
location of the valve by the temperature difference.
>> If the value location is not proper,
replace 4-way valve.
OKOK
Check Point 4: Check Voltage of Solenoid Coil
If CN105 of Control PCB dose not Show 220V + 20 V during Heating operation (Compressor is in operation),
replace Control PCB.
Check Point 2 : Check thermistor
Isn’t it fallen off the holder?
Is there a cable pinched?
>> Check characteristics of thermistor, If defective, replace the thermistor.
Indoor unit Controller PCB
Heat exchanger 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.
Cooling or Dry operation
[Indoor heat exchanger (middle) temp.] - [Room temp.] > 20degC
Heating operation
[indoor heat exchanger (middle) temp.] - [Room temp.] < -14degC
If the same operation is repeated 5 times, the compressor stops permanently.
Trouble shooting 19
OUTDOOR UNIT Error Method:
Indicate or Display:
4-way Valve Error,
Solenoid Valve Error
Refer to error code table.
Heating Operation Cooling Operation
AC
AC
SOLENOID COIL
4WAY VALVE
SOLENOID COIL
4WAY VALVE
HOT GASHOT GAS
HOT GAS
HOT GAS
ON
OFF
Resistance Value
1.5K
-
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Fujitsu ARC90LHTA Specifications

General

Brand	Fujitsu
Model	ARC90LHTA
Category	Air Conditioner
Language	English