Fujitsu AU G18LVLB Series Service Instruction page 59

Trouble shooting 30
OUTDOOR UNIT Error Method:
Compressor Temp. Error
Detective Actuators:
Compressor temperature thermistor
Forecast of Cause :
1. 3-way valve not opened
2. EEV defective, strainer clogged
3. Outdoor unit operation
4. Compressor temperature thermistor
5. 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 2 : Check the EEV, strainer
EEV open?
Strainer clogging check (before and after EEV, ACM
oil return)
Refer to "Service Parts Information 3 ".
OK
Check Point 3 : Outdoor unit fan, heat exchanger check
Check for foreign object at heat exchanger
Check if fan can be rotated by hand.
Motor check(PARTS INFORMATION 5)
OK
Check Point 5 : Check the refrigerant amount
Leak check
Indicate or Display:
Error code : A3
Detective details:
"Protection stop by "compressor temperature"
operation""generated 2 times within 24 hours
failure
, foreign matter on heat exchanger
failure
<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 EEV, strainer
EEV open?
Strainer clogging check (before and after EEV, ACM
oil return)
Refer to "Service Parts Information 3 "
OK
02-31
Outdoor unit : No indication
°C
110 during compressor
OK