The number of indoor units was too few when automatic address setting was performed.

1. The number of indoor units set at the indoor unit quantity setting SW (S004, S005) on the outdoor unit PCB is too many.
2. The inter-unit control wiring between indoor units has been cut.

1. Refer to the test run servicing materials and check the indoor unit quantity setting SW (S004, S005).
2. Check the inter-unit control wiring at the indoor and outdoor units.

After correcting the indoor unit quantity setting or the inter-unit control wiring, perform automatic address setting again.