Jandy JXi 400,000 BTU Pool and Spa Heater with Digital Temperature Control VC Error Fix: Voltage Check — Abnormal Input Voltage

Error code VC on the Jandy JXi 400,000 BTU Pool and Spa Heater with Digital Temperature Control means: Voltage Check — Abnormal Input Voltage. The heater control board detected abnormal incoming electrical voltage — pool heaters require stable 120VAC or 240VAC (depending on model configuration); low voltage (brownout conditions), high voltage (utility surges), or unstable voltage can trigger this code; check voltage at the heater junction box with a multimeter — should be within ±10% of rated voltage; long wire runs with undersized wire cause voltage drop; dedicated circuits are recommended for pool heaters

The most successful fix is "Measure and Correct Input Voltage and Wiring" (medium difficulty, ~60 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Measure and Correct Input Voltage and Wiring") is rated medium difficulty and takes about 60 minutes. Tools needed: Multimeter, T20 Torx screwdriver, Wire strippers, Voltage tester.

DIY cost: $10-$20. Professional repair typically costs $150-$220. Many homeowners save money by trying the top-ranked community fix first.

The Jandy JXi 400,000 BTU Pool and Spa Heater with Digital Temperature Control has 8 other known error codes, including: AFS (Air Flow Switch Fault), AGS (Air/Gas Switch Fault), CE (Communication Error), CF (Combustion Fan Fault), FE (Flue Exhaust Fault), and 3 more.

Error code VC also appears on 1 other Jandy model: JXi 260 260,000 BTU Pool Heater with High Efficiency and Digital Temperature Control. The fix may vary by model, so check each model's specific page for tailored repair steps.