Fujitsu AO*G09LTCN, Service Instructions Manual

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Trouble shooting 20
INDOOR UNIT
OUTDOOR UNIT Error Method:
Discharge temperature error
02-24
Indicate or Display:
Refer to error code table.
<Cooling operation>
OK
OK
OK
OK
OK
<Heating operation>
Outdoor unit Main PCB
Discharge temperature thermistor "Protection stop by "discharge temperature 110degC during compressor
operation"" generated 2 times within 24 hours.
Check Point 1 : Check if 3-way valve(gas side) is open.
Discharger thermistor characteristics check.
(Check by disconnecting thermistor from PCB.)
* For the characteristics of the thermistor, refer to the "Trouble shooting 12".
Check Point 4 : Check the discharge thermistor
EEV (EEV2, indoor unit EEV) open?
Strainer clogging check (before and after EEV, ACM
oil return)
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 5)
Check Point 2 : Check the EEV, strainer
Check Point 5 : Check the refrigerant amount
Leak check
EEV (EEV1, EEV2) open?
Strainer clogging check (before and after EEV, ACM
oil return)
Check Point 2 : Check the EEV, strainer
If the 3-way valve(gas side) was closed, open the
3-way valve(gas side) and check 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
Detective Actuators:
Detective details:
Forecast of Cause :
Refer to "Service Parts Information 3".
Refer to "Service Parts Information 3".
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
6. Main PCB failure