Fujitsu AS*G09LTCB Service Instructions Manual page 51

Trouble shooting 20
OUTDOOR UNIT Error Method:
INDOOR UNIT
Discharge temperature error
Detective Actuators:
Outdoor unit Main PCB
Discharge temperature thermistor
Forecast of Cause :
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
<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 (EEV2, indoor unit 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
operation"" generated 2 times within 24 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 EEV, strainer
EEV (EEV1, EEV2) open?
Strainer clogging check (before and after EEV, ACM
oil return)
Refer to "Service Parts Information 3".
OK
02-24
110degC during compressor
2. EEV defective, strainer clogged
5. Insufficient refrigerant
OK