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  1. Residential HVAC Forum
    My MrCool 12K minisplit had a P4 error. The indoor unit would work normally but the outdoor unit wouldn't run. I bought the exact same MrCool system. The new outdoor unit has the same model number as the old one (A-12-HP-C-230B). It occurred to me that I could simply rehook up the lines, pull a...
    mrcool p4 error
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