fault on a daikin Roundflow

[marc5180]

Can you explain what you mean by this?

When you go into the settings on the controller it eaithe says 0-01 or 0-02 meaning its either a split or a twin. This had the setting of 0-02 meaning the controller recognised that the sytem was a twin.

On a twin split, the 3 core + E connects from the outdoor unit to the first indoor unit and then to the second indoor unit.

Yes that's right, to the master first then through to the slave unit. The controller is wired into P1 P2 in the master unit.

The controller, P1 P2 connects to one (any) indoor unit only. Comms between the indoor units is carried out via interconnect 3 (on R410A systems). There is no Master/Slave configurations to do.

They should configure themselves manually i was told when the power supply is turned off the turned back on. When i first went to it today and changed the board the setting on the controller on setting "21" was 0-01 meaning it was set up as a split not a twin.

Have you checked out the interconnect wiring for crossed wires?

Checked for crossed wiring and for any breaks in the cable.