Fujitsu AMUG24LMAS Service Manual page 89

Troubleshooting 30
Compressor temperature error
Detective actuators:
Compressor temperature thermistor
Detective details:
"Protection stop
by compressor temperature ≥ 230°F (110°C)
(36/48 models 226.4
during compressor operation"
generated 2 times within 24 hours
Forecast of cause:
1. 3-way valve not opened
2. EEV defective, strainer clogged
3. Outdoor unit operation failure, foreign matter on heat-exchanger
4. Compressor temperature thermistor failure
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)
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
OK
Check Point 4 : Check the compressor temperature thermistor
Compressor temperature thermistor characteristics check.
(Check by disconnecting thermistor from PCB)
(Parts infomation 7)
OK
Check Point 5 : Check the refrigerant amount
Leak check
°F (115°C))
Indicate or Display:
Indoor unit
Operation lamp: 10 times Flash,
Timer lamp
Wired remote control
Error code : [E : A3]
Outdoor unit (AOUG36/48LMAS1)
Mode Error
2
: Light OFF
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)
OK
03-41
: 3 times Flash
A B C D E
10
3
: Light ON n : n times blinking
F