Bauknecht Refrigerator / Freezer UV

Bauknecht error code UV indicates: Bauknecht ProFresh 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 Bauknecht code UV is: On Bauknecht refrigerators (Bauknecht Dynamic Intelligence and Zen Motor direct-drive 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 Reset / Alarm button for 5 seconds until the acoustic alarm stops and temperature reading stabilizes.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Bauknecht code UV persists, the physical component causing On Bauknecht refrigerators (Bauknecht Dynamic Intelligence and Zen Motor direct-drive 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.