MRCOOL ductless-mini-split — MRCOOL single-zone and multi-zone families in official support Error Codes Directory
Complete diagnostic reference for MRCOOL ductless-mini-split — MRCOOL single-zone and multi-zone families in official support fault codes. Each code includes official root causes, safety precautions, and affected replacement components.
MRCOOL P1 or PC-01 error code: voltage protection
MRCOOL describes P1 or PC-01 as a voltage-related protection condition; exact terminal layout and acceptable supply depend on whether the documented system is 115 V, 230 V, single-zone, or multi-zone. Applies to: MRCOOL single-zone and multi-zone families in official support What counts as an acceptable supply is not one number across the MRCOOL range. A 115 V single-zone system, a 230 V single-zone system, and a multi-zone system have different expectations and different terminal arrangements, so the official material for your configuration governs, not a figure quoted for a different one. Owner-safe checks: Record the full indoor and outdoor model numbers, displayed code, and whether other circuits in the home lost power. | Check only the normal breaker position and do not repeatedly reset a breaker that trips. Qualified technician: MRCOOL's voltage measurements require panel access and live electrical testing; use a qualified HVAC or electrical professional. | A tripping breaker, heat, odor, or damaged wiring requires the equipment to remain off.