Question about Cfm Daikin R410a Split System Air Conditioner

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U4 System transmission between indoor and outdoor units Daikin

U4 System transmission between indoor and outdoor units Daikin
Failure of transmission between indoor and outdoor unit. Need details of possible causes and ways to fix

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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.
Hope this helps I take the time to answer your question so please rate me

Posted on Jun 28, 2010

  • BISHNU BHANDAI
    BISHNU BHANDAI Jul 13, 2014

    WHAT IS THE FACT MEANING OF U4 INDOOR TO OUTDOOR CONICTION IS GOOD BUT ALSO U4 FAULT BEGAINS IN NEPAL SBI BANK 1TON DAIKEN INVETER SYSTEM UNIT

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Have you found the problem with ya A/C yet PD with the U4 code, if so what was it.

Posted on Jul 27, 2010

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Daikin air condition outdoor unit pcb.how to repair

Posted on May 22, 2013

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Toshiba inverter ras10nk timer light and options lights are blinking continue

Posted on Mar 01, 2012

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1 Answer

Hello Please How to solve DAIKIN U4 Error Code?


Looks like a communication error between indoor and outdoor units. Outside at the disconnect mounted on the house cycle the power. Leave off for 10 secs ish. See what happens.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

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Ensure that the Outdoor unit has power to it and that the Main PCB has a Green Flashing (HAP) LED on it to show that it is powered up.

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