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HI, I have a Daikin Inverter Aircond Model No.FTXD60JVEA and it shutdown suddenly with a green flashing light on inside unit with a code U4, and the Led lights on outside unit dont work.

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  • sjbrewy Jul 31, 2010

    Thanks Iversh

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  • Master
  • 1,197 Answers

Error U4 on your unit means Failure of transmission between indoor and outdoor unit.

the probable reasons for this would be

Indoor to outdoor, outdoor to outdoor transmission wiring F1, F2 disconnection, short circuit or
wrong wiring
􀂄 Outdoor unit power supply is OFF
􀂄 System address doesn’t match
􀂄 Defect of indoor unit PC board
􀂄 Defect of outdoor unit PC board

to me it Sounds like an interconnecting wiring error. Check wiring connection i.e. wires are connected in right order 1 to1 2 to 2 etc. from indoor terminal board to outdoor terminal board. Also check for slack or loose connections.

However U4 code on the daikin means outdoor PCB is faulty and needs to be replaced.. and LED A not lighting also indicates faulty outoor pcb.

So give both the above conditions a check. you should be all set to go.....

Please please take necessary safety precaution before you try testing the unit yourself.... If you are least bit uncomfortable about what you are going to do... please do not hesitate to call for a technician.......

Good Luck with your fixya

Regards
Iversh

Posted on Jul 31, 2010

  • sjbrewy Jul 31, 2010

    Ive checked all wiring connections and are all fine, and has been installed for about 10 yrs, i thought it would be PCB, is there anyway i can check for faults in these boards, and are they expensive to replace.

  • SAM JAYANTH CHANDRASEKAR

    you would need to test for continuity and possible bad solder joints in the board. You would require a meter for that and a soldering tool just incase. if its just a matter of few soldering joints its not gonna cost much. the cost of repair really depends on the extent of the damage.... since you say the unit is 10 years old... i would have it replaced if the board is faulty

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