Fujitsu ADUH09LUAS1 Service Manual page 86

2-28. E: A1. 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 the electronic expansion valve (EEV) and strainer
• Check if EEV open.
Refer to outdoor unit Electronic Expansion Valve (EEV) in
03-43.
• 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
43.)
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
03-54.
2-28. 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.
Outdoor unit operation failure, foreign matter on heat
- (03-34) -
E: A1
3-way valve not opened
EEV defective, strainer clogged
exchanger
Discharge temperature thermistor failure
Insufficient refrigerant
Main PCB failure
"Service parts information"
"Service parts information"
"Thermistor resistance values"
on page
on page 03-
on page
2. Troubleshooting with error code