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

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Toshiba inverter ras10nk timer light and options lights are blinking continue

Posted on Mar 01, 2012

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