Fujitsu AUXG18KVLA Service Manual page 114

2-33. E: A1. Discharge temperature error (Outdoor unit)
Wired 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 Electrronic Expansion Valve (EEV) or Capillary tube in
formation" on page 03-57.
• 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
57.)
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
03-67.
2-33. E: A1. Discharge temperature error (Outdoor unit)
Error code
↓
↓
↓
↓
- (03-42) -
Protection stop by discharge temperature ≥ 110 °C
during compressor operation generated 2 times within
24 hours.
3-way valve not opened
EEV or capillary tube defective, strainer clogged
Outdoor unit operation failure, foreign matter on heat
exchanger
Discharge temperature thermistor failure
Insufficient refrigerant
Main PCB failure
"Service parts information"
"Thermistor resistance values"
E: A1
"Service parts in-
on page 03-
on page
2. Troubleshooting with error code