Fujitsu Comfort Series Service Manual page 42

Troubleshooting 20
OUTDOOR UNIT Error Method:
Discharge Temperature Error
Detective Actuators:
Discharge temperature thermistor
Forecast of Cause :
<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 open?
Strainer clogging check
(before and after EEV, ACM, oil return)
Refer to "Service Parts Information 3"
OK
Check Point 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(PARTS INFORMATION 4)
OK
Check Point 4 : Check the discharge temp. thermistor
Discharger temp. thermistor characteristics check
(Check by disconnecting thermistor from PCB.
Refer to the Troubleshooting 9)
OK
Check Point 5 : Check the refrigerant amount
Leak check
Indicate or Display:
Hydraulic unit :
Green Red
10
n : n times blinking
Detective details:
"Protection stop by "discharge temperature
operation'''' generated 2 times within 24 hours.
1. 3-way valve not opened
2. EEV defective, strainer clogged
3. Outdoor unit operation failure, foreign matter on heat exchanger
4. Discharge temperature thermistor failure
5. Insufficient refrigerant
Outdoor unit :
1
<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 open?
Strainer clogging check
(before and after EEV, ACM, oil return)
Refer to "Service Parts Information 3"
OK
03-23
Mode Error L1 L2 L3 L4
2 10 1
: Light OFF : Light ON n : n times blinking
°C
110 during compressor
L5 L6