Fujitsu AUG12LVLB Service Instruction page 56

Trouble shooting 21
OUTDOOR UNIT Error Method:
Discharge temp. 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
(Refer to 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
Discharge thermistor characteristics check.
(Check by disconnecting thermistor from PCB.)
* For the characteristics of the thermistor, refer to the "Trouble shooting 14".
OK
Check Point 5 : Check the refrigerant amount
Leak check
AMP Air Conditioning
Indicate or Display:
Refer to error code table.
Detective details:
"Protection stop by "discharge temperature
during 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 2-way valve(liquid side) is open.
If the 2-way valve(liquid side) was closed, open the
2-way valve(liquid side) and check operation.
OK
Check Point 2 : Check the EEV, strainer
EEV open?
Strainer clogging check
(Refer to PARTS INFORMATION 3)
OK
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