Fujitsu AUXB04GALH Service Manual page 140

Trouble shooting 62
OUTDOOR UNIT Error Method:
Compressor Tempreture Abnormal
Detective Actuators:
Compressor temperature thermistor
1. 3-way valve not opened
Forecast of Cause :
2. EEV defective, strainer clogged
3. Outdoor unit operation defective, foreign matter on heat exchanger
4. Compressor 1 temperature thermistor defective
5. Insufficient refrigerant
<Cooling operation>
Check Point 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
Check Point 2 : Check the EEV, strainer
EEV (EEV1, EEV2, indoor unit EEV) open?
Strainer clogging check (before and after EEV, 3Way Valve
oil return)
Refer to "Service Parts Information 8,9,10".
OK
Check Point 3 : Outdoor unit fan, heat exchanger chek
Check for foreign matter at heat exchanger
Check if fan can be rotated by hand.
Motor check
OK
Check Point 4 : Check the compressor 1 temperature thermistor
Compressor 1 temperature thermistor characteristics check
(Check by disconnecting thermistor from PCB)
* For the characteristics of the thermistor, refer to the "Service Parts Information 17".
OK
Check Point 5 : Check the refrigerant amount
Leak check
Indicate or Display:
E. A3. 1
Outdoor Unit : E. A3. 1
Indoor Unit
Error Code
Detective details:
"Protection stop by "compressor tempreture"
operation""generated 2 times within 40 minutes
: Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.
: A3
<Heating operation>
Check Point 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
Check Point 2 : Check the EEV, strainer
EEV (EEV1, EEV2) open?
Strainer clogging check (before and after EEV, 3 Way Valve
oil return)
Refer to "Service Parts Information 9,10".
OK
04-70
230°F(110°C)
during compressor