Fujitsu AUUH18LUAS Service Manual page 107

2-33. E: A1.X. Discharge temperature error (Outdoor unit)
→ired remote
Indicator
controller
Outdoor unit main PCB
Detective actuator
Discharge temperature thermistor
Forecast of cause
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 any of the electronic expansion valve (EEV), capillary tube, or strainer, or all
• Check if EEV open or there is a capillary tube defect.
Refer to outdoor unit Electronic Expansion Valve (EEV) or Capillary tube in
mation" on page 03-53.
• 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
53.)
Check point 4. Check the discharge thermistor
The discharge temperature thermistor characteristics check. (Check by disconnecting thermistor
from PCB.)
NOTE: For the characteristics of the thermistor, refer to
03-63.
2-33. E: A1.↓. Discharge temperature error (Outdoor unit)
Error code
Protection stop by discharge temperature ≥ 230°F
(110°C) during compressor operation generated 2 times
within 24 hours.
EEV or capillary tube defective, strainer clogged
Outdoor unit operation failure, foreign matter on heat
- (03-41) -
E: A1
3-way valve not opened
exchanger
Discharge temperature thermistor failure
Insufficient refrigerant
Main PCB failure
"Service parts infor-
"Service parts information"
"Thermistor resistance values"
on page 03-
on page
2. Troubleshooting with error code