Fujitsu ASU18RLF Service Instructions Manual page 78

Trouble shooting 33
OUTDOOR UNIT Error Method:
Discharge Temperature Error
Detective Actuators:
Outdoor unit main PCB
Discharge pipe temperature thermistor
Forecast of Cause:
1. 3-way valve not opened
3. Outdoor unit operation failure, foreign matter on heat exchanger
5. Insufficient refrigerant
<Cooling operation>
Test 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
Test 2 : Check the EEV, strainer
EEV open?
Strainer clogging check
(SERVICE PARTS INFORMATION 3)
OK
Test 3 : Check the outdoor unit fan,heat exchanger
Check for foreign object at heat exchanger
Check if fan can be rotated by hand.
Motor check (SERVICE PARTS INFORMATION 6)
OK
Test 4 : Check the discharge thermistor
Discharger thermistor characteristics check.
(Check by disconnecting thermistor from PCB.)
For the characteristics of the thermistor, refer to the "Trouble shooting 20".
*
OK
Test 5 : Check the refrigerant amount
Leak check
Indicate of Display:
Indoor Unit
Operation lamp : 10 time Flash
Timer lamp
ERROR CODE : [E : A1]
Detective details:
Protection stop by Discharge pipe temperature thermistor >
during compressor operation generated 2 times within 24 hours.
2. EEV defective, strainer clogged
6. Main PCB failure
02-38
Outdoor Unit
A
: 1 time Flash
1 1 0
: Light ON
4. Discharge temperature thermistor failure
<Heating operation>
Test 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
Test 2 : Check the EEV, strainer
EEV open?
Strainer clogging check
(SERVICE PARTS INFORMATION 3)
OK
Monitor
B C D E F
1
: Light OFF n : n time blinking
230°F(110°C)
=