Fujitsu AOU12RL2 manual Trouble shooting 18 OUTDOOR UNIT Error Method, Discharge temperature error

Trouble shooting 18 OUTDOOR UNIT Error Method:

Discharge temperature error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB Discharge temperature thermistor

Detective details:

"Protection stop by "discharge temperature 110degC during compressor operation"" generated 2 times within 24 hours.

Forecast of Cause : 1.	2/ 3-way valve not opened	2. Capillary tube, strainer clogged
3.	Outdoor unit operation failure, foreign matter on heat exchanger
4.	Discharge temperature thermistor failure	5. Insufficient refrigerant
6.	Main PCB failure

<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.

<Heating operation>

Check Point 1 : Check if 2-way valve(liquid side) is open.

If the 2-way valve(liquid side) was closed, open the 2-way valve(liquid side) and check operation.

OK

Check Point 2 : Check the capillary tube, strainer

Capillary tube, Strainer(after Capillary) clogging check. Refer to "Service Parts Information 3".

OK

Check Point 2 : Check the capillary tube, strainer

Capillary tube, Strainer(before Capillary) clogging check. 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 5)

OK

Check Point 4 : Check the discharge thermistor

Discharger thermistor characteristics check. (Check by disconnecting thermistor from PCB.)

OK

* For the characteristics of the thermistor, refer to the "Trouble shooting 10".

OK

Check Point 5 : Check the refrigerant amount

Leak check

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