Fujitsu AOG30KATA Series Service Instruction page 78

Trouble shooting 35
OUTDOOR UNIT Error Method:
Low pressure Error
Detective Actuators:
Pressure sensor
Forecast of Cause :
1. 3-way valve not opened
3. Outdoor unit fan operation defective, foreign matter at heat exchanger
4. EEV defective, strainer clogged
6. Low pressure sensor characteristics defective
<Cooling operation>
Check Point 1 : Check if 3-way valve(gas side) is open.
If the 3-way valve(gas side) was closed, open the
3-way valve(gas side) and check operation.
OK
Check Point 2 : Check the EEV, strainer clogging
Indoor unit EEV operation check
Strainer not clogged?
OK
Check Point 5 : Check the solenoid valve (SV1)
Solenoid valve operation check
OK
Check Point 6 : Check the suction pressure sensor
Suction pressure sensor characteristics check.
* For the characteristics of the suction pressure sensor.
OK
Check Point 7 : Check the refrigerant amount
Leak check
Indicate or Display:
Error code : A5
Detective details:
"Protection stop by suction pressure
repeats 5 times within 2 hours.
2. Outdoor unit ambient temperature too low
5. Solenoid valve defective
7. Insufficient refrigerant
<Heating operation>
Check Point 1 : Check if 3-way valve(liquid side) is open.
If the 3-way valve(liquid side) was closed, open the
3-way valve(liquid side) and check operation.
Check Point 2 : Check the outdoor unit ambient temperature
Outdoor ambient temperature lower than operating range?
Check Point 3 : Check the outdoor unit fan operation,
No foreign oblect in air passage?
Heat exchange fins clogged
Fan rotates?
Outdoor unit fan motor check
Check Point 4 : Check the outdoor unit EEV, strainer clogging
Outdoor unit EEV operation check
Strainer not clogged?
02-36
Outdoor unit :
Mode Error L1 L2 L3 L4
2 10 5
: Light OFF : Light ON n : n times blinking
0.02MPa continued for 5 minutes"
OK
OK
heat exchanger
OK
L5 L6