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HI, I have a Daikin Inverter split system airconditioner model No, FTXD60JVEA and the other night had it on heating mode on 21 Deg C for a while and turned it up to 24 deg and short time after it suddenly shutdown and flashed a inside unit green light that was code u4- incorrect interunit wiring(interunit). I checked all wire connectors inside/outside units unconnected/reconnected to make shaw good contact, the Led lights on outside unit dont work, checked all wire connections/plugs on all PCB boards, disconnected fan, still no good, fan turns around, not siezed. Fuses on PCB boards arent blown, PCB boards are dry/clean, no insect infestation, cant see any black puffs anywhere on boards if something has blown.

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Hi

Most probably its 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.
With these units it would probably be outdoor PCB fault. On the outdoor PCB there are 2 communication channels for both of the indoors. You can check on those terminals if they supply similar voltage to both indoors. If the signals are the same, it would be the indoor PCB, if not, outdoor PCB.

Let us know if you have something more to know else accept the suggestion.
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Posted on Jul 30, 2010

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