Fujitsu AUXB12GA* H - Page 174

Trouble shooting 89
Peripheral device No Cooling/ Heating
Forecast of Cause :
04-98
General check procedure
1. Check Error code on the VRF system. (Remote controller, Service tool, etc)
2. Check LED brinks on the controler PCB of DX-KIT
3. Check Error code on the peripheral device.
4. Check none of protection function is operating on the system.
Protection functions (For the description of protective conditions, see the service manual.)
- Abnormal Temperature: Compressor temperature, Discharge temperature, Heat-sink temperature, IDU HEX temp.
- Abnormal pressure: High pressure, Low pressure,
- Abnormal on devices: EEV coil, FAN motor, Compressor Frq,
1. Temperature controlling 2. EEV controlling 3. External Factor
Check Point 1: Temperature sensors
Sensor position / Wire connection / Temperature detection
- Measure the resistance of sensor at the terminal board, and compare the temperature (transformed with resistance value)
with the actual detecting temperature by using the Service tool.
If the sensor position was incorrect, install the sensor to the correct position
If the temperature detection was wrong, replace the sensor.
Check Point 2: EEV
Wire connection / EEV movment
- Measure the resistance of EEV coil and measure the DC12V power input at the terminal board.
EEV1: CN10_Pin No.1 - Pin No.6, Pin No.1 - Pin No.4, Pin No.2 - Pin No.3, Pin No.2 - Pin No.5
EEV2: CN11_Pin No.1 - Pin No.6, Pin No.1 - Pin No.4, Pin No.2 - Pin No.3, Pin No.2 - Pin No.5
- Check EEV initialisation movment by the power reset of DX-Kit.
- Check refrigerant flowing by measuring the temperature of pipe inlet and pipe outlet.
If the resistance of EEV coil was not correct, replace the EEV unit.
If the DC12V did not appear on the terminal, check DCV power supply on CN102.
No Voltage : Replace the power supply PCB,
DC12V appeares: Replace the controller PCB.
If the EEV did not react after power reset, or no refrigerant flowing, replace the EEV unit.
Check Point 3: External factor
Air circulation obstruction
Design mismatch (Capacity, FAN speed mismatch, Field setting (Analog signal input) etc,)
Peripheral device abnormal (See the Serivce manual for the peripheral device)
Gas / Liquid Sensor Chracterristcs (Rough value)
Temperature (°F)
Temperature (
°C)
Resistance Value (kOhm)
32 41 50 59 68 77 86 95 104 113 122
0 5 10 15 20 25 30 35 40 45 50
33.6 25.2 20.1 15.8 12.5 10.0 8.0 6.5 5.3 4.3 3.5
Inlet / Outlet Air Sensor Chracterristcs (Rough value)
Resistance Value (kOhm)
32 41 50 59 68 77 86 95 104 113 122
0 5 10 15 20 25 30 35 40 45 50
168.6 129.8 100.9 79.1 62.5 49.8 40.0 32.4 26.3 21.2 17.8
Read wire
200 ±10%
Resistance value (20°C)
White - Red
Orange - Red
Yellow - Brown
Blue - Brown
Temperature (°F)
Temperature (
°C)
Pipe (In)
Pipe (Out)
Pipe (In)
CLOSE
Example : Hot Gas
OPEN
Example : Hot Gas
Pipe (Out)