Daikin twin split trouble

[dave ldms]

attended call out to R407c Daikin 2x 10kw twin split.Fhycp100b7v1 found both master and slave indoor fans running on when stat is satisfied causing draught. spoke to daikin tech support, turns out that controller only reconised the master. altered the setting on the controller to 11 0-02 (twin split) then altered 11 2-02 to fan off whilst cooling or heating not needed. master responded to this, slave did not, fan continuing to run on. I checked wiring found p1 and p2 to controller from master only (correct) and interconnecting looped from master to slave. the slave fan does stop if controller is turned off and hi/low speeds are controllable, emergency run dip swith is set to norm. Daikin have said they can't do any more but fault is not fixed with the slave, got to go back tomorrow, anyone come accross this and resolved problem as i am running out of ideas without swapping the indoor pcbs?

[coolhandlew]

As an experiment I'd wire the remote to the other unit to swap master/slave and see what happens.