Blue Star U4 Error Code
Compressor Reverse Protection.
ac
Compressor Reverse Protection
Cause: Compressor rotating in reverse direction
How to fix: Check phase sequence of compressor wiring, correct phase order.
Blue Star boards that may fix U4
If the board is the cause, these refurbished Blue Star boards are in stock. Match the part number before you order.
Bluestar F35BS 1 Ton Outdoor PCB
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Bluestar MIV50BS 1.5 Ton Inverter PCB
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Bluestar Godrej GRJ554-A V1 2013
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Bluestar Godrej GRJ519-A3 V1 Non Inverter PCB
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