Fujitsu AUG12LVLB Service Instruction page 57

Trouble shooting 22
OUTDOOR UNIT Error Method:
Compressor temp. error
Detective Actuators:
Compressor 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 compressor thermistor
Compressor thermistor characteristics check
(Check by disconnecting thermistor from PCB.)
* For the characteristics of the thermistor,
refer to the APPENDING DATA (Chapter 3).
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
"compressor temperature
generated 2 times within 24 hours.
1. 3-way valve not opened
3. Outdoor unit operation failure, foreign matter on heat exchanger
4. Compressor temperature thermistor failure
6. Main PCB failure
110°C during compressor operation""
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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