Fujitsu Troubleshooting Air Conditioning Fault Codes: Discharge Temperature Error Guide

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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

02-20

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Contents Service Instruction Contents Appending Data Page Wall Mounted type Cooling Operation DRY Operation Heating Operation01-03 Auto Changeover OperationCooling Operation Indoor FAN ControlFan speed FAN OperationMoisture Return Prevention Control Cooling mode& Dry mode Cool AIR Prevention Control Heating modeHeating Operation Outdoor Fan Motor Outdoor FAN ControlFunction Range Adjust the RIGHT-LEFT LouversLouver Control Vertical Louver ControlOpeartion Frequency Control AT Normal Start UP Limitation of Compressor Frequency by Outdoor TemperatureCompressor Control Opeartion Frequency RangeProgram Timer Timer Opeartion ControlCooling operation mode Sleep TimerHeating operation mode 24C 75F Prevent to Restart for 3 Minutes 3 Minutes STFOUR-WAY Valve Extension Select Auto RestartEconomy Operation Powerful OperationForced Cooling Operation Test Operation Compressor PreheatingRelease Condition Defrost Operation ControlCondition of Starting the Defrost Operation Condition of the Defrost Operation CompletionNormal defrost Integrating defrost Defrost Flow Chart01-14 Defrost end 01-15 OFF Defrost Opeartion Control01-16 Discharge GAS Temperature Overrise Prevension ControlVarious Protections Current Release ControlHigh Temperature Release Control Heating Mode Antifreezing Control Cooling and Dry modeCooling Pressure Overrise Protection Trouble Shooting Error Display TroubleshootingCheck Point 4 Check Serial Signal Reverse Transfer Signal Trouble Shooting with Error CodeOutdoor unit Main PCB Indoor unit Controller PCB Indoor unit Fan motor Check Point 3 Replace Controller PCB Indoor unit Controller PCBCheck Point Check Indoor unit electric components Check Point Check external cause such as noiseCheck Point 2 Replace Controller PCB Indoor unit Controller PCB Indicator PCB Manual auto switchIndoor unit Controller PCB Room temperature thermistor Indoor unit Controller PCB Heat Ex. temperature thermistor Check Point 3 Check Indoor unit fan motor Check Point 2 Check ambient temp. around motorCheck Point 1-2 Check external cause Check Point 2 Replace Main PCBCheck Point 3 Replace Main PCB Check Point 2 Check connection of Connector02-11 CN71 CN70 Outdoor unit Main PCB Discharge pipe temperature thermistorResistance Value k 606 759 213 8531 Outdoor unit Main PCB Heat exchanger temperature thermistorOutdoor unit Main PCB Outdoor temperature thermistor Check Point 4 Replace Main PCB Check Point 2 Check Heat exchanger Outdoor unit Main PCB CompressorCheck Point 3 Check Compressor Check Point 3 Replace Main PCB Check Point 3 Check Outdoor unit fan motor Outdoor unit Main PCB Outdoor unit Fan motorCheck Point 4 Check Output Voltage of Main PCB Check Point 3 Check the solenoid coil and 4-way valve Check Point 2 Check each thermistorForecast of Cause Indoor Unit No Power Trouble Shooting with no Error CodeCheck Point 3 Check Electrical Components Outdoor Unit No Power 02-23 Check Point 3 Check Site condition Check Point Check Indoor/ Outdoor installation conditionNo Cooling / No Heating Check Point 2 Check Outdoor unit operationWater Leaking Abnormal NoiseCompressor Service Parts InformationReplace Compressor Inverter Compressor Blue Red Outdoor unit Electronic Expansion Valve EEVCheck Point 5 Check Opening and Closing Operation of Valve Outdoor unit fan motor Indoor unit fan motorPage Appending Data Heating Room Temperature Correction Function SettingSetting the Filter Sign Cooling Room Temperature CorrectionRemote controller signal code Setting the Auto RestartYes Procedures to change the Function Setting for wireless RC Selecting the Function Number and Setting Value Remote Controller Signal Code Setting Discharge thermistor Room temperature thermistorPage 1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan