Ariston Refrigerator / Freezer UV

Ariston error code UV indicates: Ariston Active Oxygen Total NoFrost Refrigerator / Freezer: Diagnostic code UV indicates inverter driver DC link under-voltage trip; compressor cannot maintain required torque..

The primary root cause for Ariston code UV is: On Ariston refrigerators (Ariston Aqualtis and HD Defrost electronic platform architecture): Grid brownout drop below 180V AC, high-resistance wall outlet plug, or dried-out electrolytic reservoir capacitors (< 210V DC bus)..

To resolve error code UV: Verify line voltage under compressor startup load (min 207V AC). Check DC bus voltage on inverter board (trip occurs below 210V DC). Replace inverter board if supply is 230V AC. Hold Alarm Reset pad for 5 seconds until audible alert ceases and active cooling LED illuminates steady.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Ariston code UV persists, the physical component causing On Ariston refrigerators (Ariston Aqualtis and HD Defrost electronic platform architecture): Grid brownout drop below 180V AC, high-resistance wall outlet plug, or dried-out electrolytic reservoir capacitors (< 210V DC bus). must be inspected or replaced.

Set a digital multimeter to ohms (Ω). Disconnect power and test Compressor Motor Windings (Run/Start) & Defrost Heater across Across 3 compressor pins (Common, Run, Start): R(C-S) + R(C-R) = R(S-R). Winding to earth: >20MΩ (OL).. Expected nominal reading is 15Ω–25Ω (Run C-R), 20Ω–35Ω (Start C-S), 200Ω–400Ω (Defrost Heater). PTC Relay: 10Ω–30Ω at 25°C.. Tolerance: ±10%. Any low insulation resistance to casing (<2MΩ) trips the breaker. Defrost bimetal reads <0.5Ω when sub-zero..

Standard electrical safety protocol: 1. Disconnect 230V mains power before opening panels. 2. Verify zero voltage at test points. 3. Allow hot water or heating elements to cool below 30°C before handling.