Blue Star E6 Error Code
Communication Error.
ac · BO-5CNHW12QATU/QATX, BO-5CNHW18QATU/QATX
Communication Error
Cause: Signal wire fault between indoor and outdoor unit
How to fix: Check IDU-ODU communication wire for continuity, loose terminals, or damage. Check shielded cable grounding.
Blue Star boards that may fix E6
If the board is the cause, these refurbished Blue Star boards are in stock. Match the part number before you order.

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