Field Actions
DISPATCHAlways disconnect appliance from 230V/400V mains before opening panels. Use CAT III multimeter for circuit testing.
Frequently Asked Questions: Liebherr E28
FAQ TREEWhat does error code E28 mean on a Liebherr appliance?
Liebherr error code E28 indicates: Liebherr BioFresh / BluPerformance / Monolith / NoFrost Premium Refrigerator & Wine Cellar: Diagnostic fault code E28 registered by the microcomputer controller. Electronic expansion valve (EEV) stepper motor coil B open circuit.
What is the root cause of Liebherr error code E28?
The primary root cause for Liebherr code E28 is: On Liebherr appliances engineered with BioFresh climate chambers, BluPerformance base refrigeration module, DuoCooling dual refrigerant circuits, and VCC inverter compressor with 4.7 kΩ NTC thermistors: valve stepper coil phase B wire broken Metrological tolerance verification: phase resistance 46 Ω ± 4 Ω...
How do I fix or resolve Liebherr error code E28?
To resolve error code E28: Disconnect mains power before servicing. Unplug the harness at the main PCB and use a calibrated digital multimeter: measure EEV coil resistance between common and phase B pins (expected ~46 Ω). Inspect contacts for pin oxidation or loose terminals. Replace defective part if out of tolerance, re-energize and clear error: Turn appliance on. Hold SuperFrost (or Alarm) for 5 seconds until 'c' or 'C' menu appears. Press Up/Down to navigate to '0' or 'rS', then press SuperFrost for 3 seconds to clear the fault log and exit service test mode.
Is it safe to clear Liebherr error code E28 by resetting power?
Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Liebherr code E28 persists, the physical component causing On Liebherr appliances engineered with BioFresh climate chambers, BluPerformance base refrigeration module, DuoCooling dual refrigerant circuits, and VCC inverter compressor with 4.7 kΩ NTC thermistors: valve stepper coil phase B wire broken Metrological tolerance verification: phase resistance 46 Ω ± 4 Ω.. must be inspected or replaced.
How do I test electrical resistance for Liebherr code E28 using a multimeter?
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..
What safety protocol must be followed before servicing Liebherr code E28?
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.
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