Fujitsu AOTG30KMTC, Service Manual, Page: 90 / 199

2-35. E: A3. Compressor temperature error (Outdoor unit)
Indicator
Indoor unit
Operation indicator 10 time flash
Timer indicator 3 time flash
Economy indicator Continuous flash
Error code E: A3
outdoor unit
Refer to “Error code table (Outdoor unit: for 34 model
only)” on page 1
Detective actuator
Outdoor unit main PCB Protection stop by compressor temperature ≥ 108°C
during compressor operation generated 2 times within
24 hours.
Compressor temperature thermistor
Forecast of cause
3-way valve not opened
EEV defective, strainer clogged
Outdoor unit operation failure, foreign matter on heat
exchanger
Compressor temperature thermistor failure
Insufficient refrigerant
Main PCB failure
Check point 1. Check if 3-way valve is open
If the 3-way valve is closed, open the 3-way valve and check operation.
NOTE: For cooling operation, check gas side of the 3-way valve.
For heating operation, check liquid side of the 3-way valve.
↓
Check point 2. Check the electronic expansion valve (EEV) and strainer
• Check if EEV open.
Refer to outdoor unit Electronic Expansion Valve (EEV) in
"Service parts information" on page
03-75.
• Check the strainer clogging.
↓
Check point 3. Check the outdoor unit fan and heat exchanger
• Check for foreign object at heat exchanger
• Check if fan can be rotated by hand.
• Check the motor. (Refer to outdoor unit fan motor in "Service parts information" on page 03-
75.)
↓
Check point 4. Check the compressor thermistor
The compressor temperature thermistor characteristics check. (Check by disconnecting thermistor
from PCB.)
NOTE: For the characteristics of the thermistor, refer to "Thermistor resistance values" on page
03-86.
↓
2-35. E: A3. Compressor temperature error (Outdoor unit)
- (03-52) -
2. Troubleshooting with error code
TROUBLESHOOTING TROUBLESHOOTING