Carrier P4 Error Code
Compressor Out-of-Step Abnormal.
ac
Compressor Out-of-Step Abnormal
Cause: Compressor loses synchronization during run — same display code as starting fault, differentiated by flash count
How to fix: Check compressor drive circuit, wiring, and refrigerant charge.
ac
Compressor Starting Abnormal
Cause: Compressor fails to start correctly
How to fix: Check compressor winding resistance, start capacitor (if applicable), and wiring.
Carrier boards that may fix P4
If the board is the cause, these refurbished Carrier boards are in stock. Match the part number before you order.
Carrier SKFN50PG Inverter PCB
From ₹2,800
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Carrier Voltas Godrej SKFW50C4 Outdoor PCB
From ₹5,500
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Carrier P-Series 42QP8A5501C 2 Ton Non Inverter PCB
From ₹2,800
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CACE-KFR50G Non Inverter PCB
From ₹1,800
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