8 TroubleshootingUser reference guide19ATXM20~50N2V1BDaikin room air conditioner4P518786-2C – 2018.098.2 Solving problems based on errorcodesWhen a problem happens, an error code appears on the userinterface. It is important to understand the problem and to takemeasures before resetting an error code. This should be done by alicensed installer or by your local dealer.This chapter gives you an overview of all error codes and thecontent of the error code as it appears on the user interface.For a more detailed troubleshooting guideline for each error, pleasesee the service manual.Fault diagnosis by user interfaceThe user interface can receive an error code from the indoor unitreferring to the fault. It is important to understand the problem andtake measures before resetting the error code. This should be doneby a licensed installer or your local dealer.To see the error code on the user interface:1 Hold for about 5 seconds.Result: blinks in the temperature display section.2 Press repeatedly until a continuous beep is heard.Result: The code is now displayed on the display.INFORMATION▪ A short beep and 2 consecutive beeps indicate non-corresponding codes.▪ To cancel the code display, hold the cancelbutton for 5 seconds. The code will also disappear fromthe display if the button is NOT pressed within1 minute.SystemError code DescriptionNormalRefrigerant shortageOvervoltage detectionSignal transmission error (between indoor andoutdoor unit)Indoor/outdoor unit combination faultIndoor unitError code DescriptionIndoor unit PCB abnormalityFreeze-up protection or high-pressure controlFan motor (DC motor) abnormalityIndoor heat exchanger thermistor abnormalityRoom temperature thermistor abnormalityOutdoor unitError code Description4-way valve abnormalityOutdoor unit PCB abnormalityOverload activation (compressor overload)Compressor lockDC fan lockDischarge pipe temperature controlHigh-pressure control (in cooling mode)Compressor system sensor abnormalityPosition sensor abnormalityDC voltage / current sensor abnormalityError code DescriptionOutdoor temperature thermistor abnormalityDischarge pipe thermistor abnormalityOutdoor heat exchanger thermistor abnormalityElectrical parts heat errorRadiation fin temperature riseInverter instantaneous overcurrent (DC)Radiation fin thermistor abnormality8.3 Troubleshooting for wirelessconnection adapterThe following table provides a brief description of how to deal withsome problems. If none of the following solutions fix the problem, goto http://www.onlinecontroller.daikineurope.com/ for moreinformation and FAQ.Problem MeasureNone of the LEDs light ▪ Try operating the unit with theuser interface.▪ Turn the unit off and then backon.▪ Make sure the LEDs are notdisabled in the application.▪ Check if the adapter isinstalled correctly.The Wireless LAN adapter is notvisible on the unit overviewscreen ("Home" screen) after theWireless LAN adapter has beenconfigured.▪ Check that the power is on.▪ Check that the RUN LED is lit.▪ If the AP LED is lit, press theMODE buttton for 2 seconds toswitch to RUN mode.▪ If the RUN LED is blinking, tryconnecting the WLAN adapterto the wireless network again.Make sure the Wireless LANadapter is close enough to therouter (Wireless LAN accesspoint).▪ If the RUN LED is lit, makesure that the smartphone ortablet is connected to thesame wireless LAN network asthe Wireless LAN adapter.When trying to make a directconnection to the adapter (APmode), the Wireless LAN adapteris not visible in the available Wi-Fi networks list of the phone/tablet.▪ If the AP LED is not lit, pressthe MODE button for2 seconds to switch to APmode.▪ If the AP LED is blinking,please wait until the AP LED islit (approximately 1 minute).The Wireless LAN adapter isstill starting up.▪ If the AP LED is lit, switch toRUN mode by pressing theMODE button for 2 seconds.Now switch back to AP modeby pressing the MODE buttonagain for 2 seconds. Thisprocedure will change thewireless channel on which theWireless LAN adapter isoperating. Repeat ifnecessary.