Could have taken a severe power hit / surge ? Do the PC boards smell burned ?
Do you have a volt / ohm meter ? If so , check for good voltage coming into the indoor units . I think the power for the indoor units comes from the out door unit ? Check if the outdoor unit is providing power , at its terminal board . Look for fuses inside the out door unit .
Check the indoor unit fans for open and / or ground .
God bless
Wyr
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