I have a Fujitsu split fan system with two indoors fans (connected to one compressor). I'm experiencing a peculiar problem in one room where I set the A/C to on, the compressor starts outside but no cold air is blowing (just the fan). If I go ahead and turn the other indoor unit to on, then cold air gets blown in both rooms (even in the unit in the other room which wasn't blowing cold air). Any insight? Someone recommended I check the relay, but am not sure where to find it.

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