Carrier 38GJt Owner's Manual & Installation Instructions page 19

Mode conflict
running
COOL or HEAT mode can not
be operated
next operation
When the indoor operating mode conflicts with that of
outdoor unit, the indoor fault indicator flashes and the
conflict appears on the wired controller after 5 minutes.
The indoor unit stops. The outdoor operating mode
switches to the mode of the indoor unit. Next,
the unit returns to normal. The COOL mode does not
conflict with the DRY mode. The FAN mode does not
conflict with any mode.
19