Low Pressure Error - Fujitsu AOYG45LAT8 User Manual

Trouble shooting 36
OUTDOOR UNIT Error Method:

Low Pressure Error

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
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
(PARTS INFORMATION 5)
OK
Check Point 7 : Check the refrigerant amount
Leak check
Indicate or Display:
Outdoor Unit : E. A5. 1
Indoor Unit : Operation LED 10 times Flash, Timer LED 5 Times Flash,
Economy LED Continuous Flash.
Error Code : A5
Detective details:
"Protection stop by suction pressure
repeats 5 times within 2 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 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 EEV1 operation check
Strainer not clogged?
Refer to "Sevice Parts Information 3"
02-52
0.05MPa continued for 5 minutes"
OK
OK
heat exchanger
OK