Low Pressure Abnormal - Fujitsu Airstage J-II Service Manual

Trouble shooting 45
OUTDOOR UNIT Error Method:

Low Pressure Abnormal

Detective Actuators:
Suction pressure sensor
Forecast of Cause : 1. 3-way valve not opened 2. Outdoor unit ambient temperature too low
3. Outdoor unit fan operation defective, foreign matter at heat exchanger
4. EEV defective, strainer clogged 5. Solenoid valve defective
6. Low pressure sensor characteristics defective 7. Insufficient refrigerant
<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 4 : Check the indoor unit EEV,
strainer clogging
Indoor unit EEV operation check
Strainer not clogged?
OK
Check Point 5 : Check the solenoid valve (SV2)
Solenoid valve operation check
Refer to "Service Parts Information".
OK
Check Point 6 : Check the suction pressure sensor
Suction pressure sensor characteristics check
* For the characteristics of the suction pressure sensor, refer to "Service
Parts Information".
OK
Check Point 7 : Check the refrigerant amount
Leak check
Indicate or Display:
Outdoor Unit : E. A5. 1
Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.
Error Code : A5
Detective details:
"Protection stop by "suction pressure
or "suction pressure 0.05MPa" during operation of any compressor"" was
generated 5 times within 3 hours
<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 matter 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 EEV1 operation check
Strainer not clogged?
Refer to "Service Parts Information".
04-55
0.10MPa continued for 10 minutes"
OK
OK
heat exchanger
OK