Fujitsu AGU12RLF Service Instruction page 50

Trouble shooting 20
OUTDOOR UNIT Error Method:
INDOOR UNIT
Discharge temperature error
Detective Actuators:
Outdoor unit Main PCB
Discharge temperature thermistor
Forecast of Cause :
<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 : Check the outdoor unit fan,heat exchanger
Check for foreign object at heat exchanger
Check if fan can be rotated by hand.
Motor check (PARTS INFORMATION 5)
OK
Check Point 4 : Check the discharge thermistor
Discharger thermistor characteristics check.
(Check by disconnecting thermistor from PCB.)
* For the characteristics of the thermistor, refer to the "Trouble shooting 12".
OK
Check Point 5 : Check the refrigerant amount
Leak check
Indicate or Display:
Refer to error code table.
Detective details:
"Protection stop by "discharge temperature
compressor operation"" generated 2 times within 24 hours.
1. 3-way valve not opened
3. Outdoor unit operation failure, foreign matter on heat exchanger
4. Discharge temperature thermistor failure
6. Main PCB failure
2. EEV defective, strainer clogged
5. 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.
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
02-25
230°F(110°C) during