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  1. #1
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    Troubleshooting for Daikin Aircon CTK25FVEN


    Hi guys,

    I think I have some problem with my Daikin CTK25FVEN. When I switch on my aircon with the wireless remote last night, the green light which indicate that the aircon is on and working kept blinking but the aircon did not work. Normally the green light should just light up and not blinking. But when I try with my other few units in the other rooms they are working fine. Anyone know what is wrong with it and how to solve this problem?

    Thanks!



  2. #2
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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    you must use your remote control to find out the error code 1st,i suspect is that common fault coil themistor faulty(C4).

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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    Most common fault for failure is lack of refrigerant !

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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    DAIKIN error codes:

    AO Indoor Error of external protection device
    A1 Indoor PCB defect
    A3 Indoor Malfunction of drain Level control system
    A5 Indoor Freeze-up prevention
    A6 Indoor Fan motor lock, Overload
    A7 Indoor Malfunction of swing motor flap
    A9 Indoor Malfunction of EEV
    AF Indoor Drain level above limit (clogging)
    AJ Indoor Malfunction of capacity set device
    C3 Indoor Malfunction of drain thermistor
    C4 Indoor Malfunction of liquid pipe thermistor
    C5 Indoor Malfunction of gas pipe thermistor
    C7 Indoor Lower louvre limit switch/motor
    C9 Indoor Malfunction of air thermistor
    CC Indoor Malfunction of moisture sensor
    CA Indoor Malfunction of discharge air thermistor
    CJ Indoor Malfunction of remote control thermistor
    CE Indoor Malfunction of radiant heat sensor
    E0 Outdoor Activation of outdoor safety device
    E1 Outdoor PCB defect
    E3 Outdoor Activation of high pressure switch
    E4 Outdoor Activation of low pressure switch
    E5 Outdoor Activation of compressor over heat protection
    E5 Outdoor Compressor motor lock
    E6 Outdoor Compressor start up error
    E6 Outdoor Standard compressor lock/overcurrent
    E7 Outdoor Fan motor lock, Overload
    E8 Outdoor Inverter input overcurrent
    E9 Outdoor Malfunction of EEV
    EA Outdoor Four way valve defective.
    F3 Outdoor Abnormal discharge pipe temperature
    F6 Outdoor Refrigerant overcharged
    FC Outdoor Low pressure drop.
    H3 Outdoor High pressure switch defect
    H4 Outdoor Low pressure switch defect
    H6 Outdoor Compressor motor position detection sensor error
    H7 Outdoor Fan motor position detection sensor error
    H8 Outdoor Current transformer error
    H9 Outdoor Malfunction of air thermistor
    J1 Outdoor Malfunction of pressure sensor
    J2 Outdoor Current sensor malfunction
    J3 Outdoor Malfunction of discharge pipe thermistor
    J4 Outdoor Low pressure saturation thermistor
    J5 Outdoor Malfunction of suction pipe thermistor
    J6 Outdoor Malfunction of heat exchanger thermistor
    J7 Outdoor Malfunction of heat exchanger liquid thermistor
    J8 Outdoor Malfunction of liquid pipe thermistor
    J9 Outdoor Malfunction of gas pipe thermistor
    JA Outdoor Malfunction of discharge pipe pressure sensor
    JC Outdoor Malfunction of suction pipe pressure sensor
    JH Outdoor Malfunction of oil temperature sensor
    L0 Outdoor Malfunction of inverter
    L3 Outdoor Electronic component box overheat
    L4 Outdoor Inverter cooling defect
    L5 Outdoor Comp motor ground fault, Short circuit
    L6 Outdoor Compressor motor grounding/short circuit
    L7 Outdoor Total input overcurrent
    L8 Outdoor Comp overload, Motor disconnected
    L9 Outdoor Compressor lock
    LA Outdoor Power unit malfunction
    LC Outdoor Transmission between inverter & outdoor
    P1 Outdoor Inverter over ripple
    P3 Outdoor Thermistor abnormality
    P4 Outdoor Power unit humidity sensor malfunction
    PJ Outdoor Failure of capacity set resistor
    U0 System Shortage of refrigerant or EEV failure
    U1 System Negative phase, Open phase
    U2 System Power supply insufficient
    U3 System Wiring check operation not executed
    U3 System Mismatch of indoor and outdoor units (Split only)
    U4 System Transmission between indoor units
    U5 System Transmission to remote controller
    U6 System Malfunction transmission outdoor to BP unit
    U7 System Transmission between outdoor units
    U7 Outdoor Malfunction between outdoor boards(RMX/RX RK)
    U8 System Transmission between master & slave R/C
    U9 System Transmission error between indoor to outdoor
    UA System Excessive number of fancoils
    UC System Address duplication of central controllers
    UE System Transmission error between indoor & central
    UF System Refrigeration system not set/wiring - piping
    UF System Terminals 1 and 3 crossed (Split/Skyair)

    If your DAIKIN remote controller comes with a "test" button, use it. Otherwise press the Temperature UP,
    Temperature DOWN and the MODE buttons all at the same time. I repeat, all 3 buttons at the same time.

    You will see 00 on the remote controller. The first "0" will be blinking.

    Stand facing the particular air conditioner you wanted to test.

    Now press the Temperature UP button, "0" will become "A" and the air conditioner will respond with either a single
    beep or double beep.

    Carry on pressing the Temperature UP button and listen to the beeping sound, stop when you hear a double beep.
    For example: it is now showing "C0".

    Now press the MODE button, the second "0" will be blinking.
    Now press the Temperature UP button, "0" will become "1" and the air conditioner will respond with either a double
    beep or a continuous beep.

    The continuous beep is the error code. For example "C4", it means it is a faulty liquid pipe thermistor

  5. #5
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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    Hello
    Is this unit a multi system or is it a one to one
    sometimes if its a multi and you have other units operating on different modes then one system does not work as it is waiting for the other unit to complete that function before it can start the others.
    He who does nothing does nothing wrong !

  6. #6
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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    thanks i did what u told me to do on the remote. i found out its U4 System Transmission between indoor units

    what exactly does that mean?.. i just suddenly happened

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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    Turn off the power to condensing unit for thirty seconds or so, then switch back on. If you are lucky, it will fire up again, if not , new outdoor main pcb. I assume the unit is inverter, i'm not familiar with that model number.

    Andy

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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    Quote Originally Posted by astiquer View Post
    DAIKIN error codes:

    AO Indoor Error of external protection device
    A1 Indoor PCB defect
    A3 Indoor Malfunction of drain Level control system
    A5 Indoor Freeze-up prevention
    A6 Indoor Fan motor lock, Overload
    A7 Indoor Malfunction of swing motor flap
    A9 Indoor Malfunction of EEV
    AF Indoor Drain level above limit (clogging)
    AJ Indoor Malfunction of capacity set device
    C3 Indoor Malfunction of drain thermistor
    C4 Indoor Malfunction of liquid pipe thermistor
    C5 Indoor Malfunction of gas pipe thermistor
    C7 Indoor Lower louvre limit switch/motor
    C9 Indoor Malfunction of air thermistor
    CC Indoor Malfunction of moisture sensor
    CA Indoor Malfunction of discharge air thermistor
    CJ Indoor Malfunction of remote control thermistor
    CE Indoor Malfunction of radiant heat sensor
    E0 Outdoor Activation of outdoor safety device
    E1 Outdoor PCB defect
    E3 Outdoor Activation of high pressure switch
    E4 Outdoor Activation of low pressure switch
    E5 Outdoor Activation of compressor over heat protection
    E5 Outdoor Compressor motor lock
    E6 Outdoor Compressor start up error
    E6 Outdoor Standard compressor lock/overcurrent
    E7 Outdoor Fan motor lock, Overload
    E8 Outdoor Inverter input overcurrent
    E9 Outdoor Malfunction of EEV
    EA Outdoor Four way valve defective.
    F3 Outdoor Abnormal discharge pipe temperature
    F6 Outdoor Refrigerant overcharged
    FC Outdoor Low pressure drop.
    H3 Outdoor High pressure switch defect
    H4 Outdoor Low pressure switch defect
    H6 Outdoor Compressor motor position detection sensor error
    H7 Outdoor Fan motor position detection sensor error
    H8 Outdoor Current transformer error
    H9 Outdoor Malfunction of air thermistor
    J1 Outdoor Malfunction of pressure sensor
    J2 Outdoor Current sensor malfunction
    J3 Outdoor Malfunction of discharge pipe thermistor
    J4 Outdoor Low pressure saturation thermistor
    J5 Outdoor Malfunction of suction pipe thermistor
    J6 Outdoor Malfunction of heat exchanger thermistor
    J7 Outdoor Malfunction of heat exchanger liquid thermistor
    J8 Outdoor Malfunction of liquid pipe thermistor
    J9 Outdoor Malfunction of gas pipe thermistor
    JA Outdoor Malfunction of discharge pipe pressure sensor
    JC Outdoor Malfunction of suction pipe pressure sensor
    JH Outdoor Malfunction of oil temperature sensor
    L0 Outdoor Malfunction of inverter
    L3 Outdoor Electronic component box overheat
    L4 Outdoor Inverter cooling defect
    L5 Outdoor Comp motor ground fault, Short circuit
    L6 Outdoor Compressor motor grounding/short circuit
    L7 Outdoor Total input overcurrent
    L8 Outdoor Comp overload, Motor disconnected
    L9 Outdoor Compressor lock
    LA Outdoor Power unit malfunction
    LC Outdoor Transmission between inverter & outdoor
    P1 Outdoor Inverter over ripple
    P3 Outdoor Thermistor abnormality
    P4 Outdoor Power unit humidity sensor malfunction
    PJ Outdoor Failure of capacity set resistor
    U0 System Shortage of refrigerant or EEV failure
    U1 System Negative phase, Open phase
    U2 System Power supply insufficient
    U3 System Wiring check operation not executed
    U3 System Mismatch of indoor and outdoor units (Split only)
    U4 System Transmission between indoor units
    U5 System Transmission to remote controller
    U6 System Malfunction transmission outdoor to BP unit
    U7 System Transmission between outdoor units
    U7 Outdoor Malfunction between outdoor boards(RMX/RX RK)
    U8 System Transmission between master & slave R/C
    U9 System Transmission error between indoor to outdoor
    UA System Excessive number of fancoils
    UC System Address duplication of central controllers
    UE System Transmission error between indoor & central
    UF System Refrigeration system not set/wiring - piping
    UF System Terminals 1 and 3 crossed (Split/Skyair)

    If your DAIKIN remote controller comes with a "test" button, use it. Otherwise press the Temperature UP,
    Temperature DOWN and the MODE buttons all at the same time. I repeat, all 3 buttons at the same time.

    You will see 00 on the remote controller. The first "0" will be blinking.

    Stand facing the particular air conditioner you wanted to test.

    Now press the Temperature UP button, "0" will become "A" and the air conditioner will respond with either a single
    beep or double beep.

    Carry on pressing the Temperature UP button and listen to the beeping sound, stop when you hear a double beep.
    For example: it is now showing "C0".

    Now press the MODE button, the second "0" will be blinking.
    Now press the Temperature UP button, "0" will become "1" and the air conditioner will respond with either a double
    beep or a continuous beep.

    The continuous beep is the error code. For example "C4", it means it is a faulty liquid pipe thermistor
    how can i fix the problem if U0 to UF gives a double beep?

  9. #9
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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    Double beep indicates you have the first part of the fault code correct, you need to listen for one long beep.
    It will be U_

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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    Hi, i've been having similar problems with my Daiken inverter also. Its been shuttin down randomly and I have to switch it off at the power board to get it back on again. Also, its not cooling the room very well at all, though it seems to work a bit better at night.

    Anyway, I did what was suggested above and found the error code on my remote. It was F3 - Outdoor abnormal discharge temperature. Can anyone tell me what's involved with this and how to fix it?

  11. #11
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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    Quote Originally Posted by Gibbering Fool View Post
    Hi, i've been having similar problems with my Daiken inverter also. Its been shuttin down randomly and I have to switch it off at the power board to get it back on again. Also, its not cooling the room very well at all, though it seems to work a bit better at night.

    Anyway, I did what was suggested above and found the error code on my remote. It was F3 - Outdoor abnormal discharge temperature. Can anyone tell me what's involved with this and how to fix it?
    most probably a gas leak

  12. #12
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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    Sounds to me as quoted above that you are short on refrigerant thats usually what abnormal discharge temperature points to

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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    Hi gents,

    Sorry to bump quite an old thread, but I was hoping someone could tell me -- when running the diagnostic above, mine gives me the code "UX" (well I assume it's an X), which isn't on the list.

    Different model though -- It's an FTXS35EVMA or something like that.

    Does this mean I need to get it serviced? It's brand new (and 2 other units are having this problem as well)

  14. #14
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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    Quote Originally Posted by boxsmasher View Post
    gives me the code "UX"
    Now that I think of it, it's probably UH. Derr.

  15. #15
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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    Hi gents,
    i am new on this forum and I know is an old thread, holpefully you can help me. I have a 4MKD90 multi split (all 4 ports are used) there is 2 of them that get to an standby mode (green led blinking) during nigth, the code for those unit is J9 (gas pipe termistor) the other does not provide any fault code. I check the gas pipe termistor and they are fine. Also I check the Electronic valve and they are good. I took the outdoor PCB to the waranty services for testing and they claim the board is good. The refrigerant was check and is fine. (actually we recovery the refrigerant and load it again by weigth). the two modules for the indoor units failing were replaced one or two month ago. I have no more bullets on the troubleshooting. I still incline on the outdoor PCB board, but if you hav any recomendation please advice.

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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    Try a wiring correction test. Might be your problem.

  17. #17
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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    I tried the wiring check function without results, also I check all the termistors outdoor, discharge, etc. all are fine. Furthermore Also I swap the indoor board of one which read out the fault code with one that is working properly (to rule out the modules) but still the sameand the

  18. #18
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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    Quote Originally Posted by Andy AC View Post
    Turn off the power to condensing unit for thirty seconds or so, then switch back on. If you are lucky, it will fire up again, if not , new outdoor main pcb. I assume the unit is inverter, i'm not familiar with that model number.

    Andy
    Hi, I'm also having U4 error. Does this mean it's the main board issue? Appreciate your advice. Thanks in advance.

  19. #19
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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    like you guys going nuts over this F3 fault..local engineers (not Daikin) have tried everything ..Daikin engineers turned upp say board test shows no problems gassed up and ran for a while then back to same problem 3 units on this one ..the stand alone unit runs fine...will have to sleep in lounge when it hot
    Any ideas please..

    Martin

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    Re: Troubleshooting for Daikin Aircon CTK25FVEN

    Quote Originally Posted by declan simmonds View Post
    Hello
    Is this unit a multi system or is it a one to one
    sometimes if its a multi and you have other units operating on different modes then one system does not work as it is waiting for the other unit to complete that function before it can start the others.
    Thank you Declan, I checked all four units and found one set to heating, changed mode (after replacing controller batteries) and am now basking in cool air - it's 34 celsius outside.
    Maybe an indicator, the operation light on the non-working units was flashing, but no mention of this in the handbook.
    Thanks again
    Misterfish

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