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Neff • Central Diagnostic Dictionary

195 Verified Codes in Database

Neff Error Codes & Diagnostics

Access our premium database of error codes, common faults, and professional repair solutions for Neff appliances.

Luxury front-loading washing machine in brushed titanium with illuminated dark glass drum

CodeAppliancesFault / DiagnosticsRepair InstructionsAction

E19

Dishwasher

Drainage System & Drain Pump

Neff N 50 / N 70 / N 90 Chef 70° & DoorOpen Assist dishwasher: Dispenser actuator / heat exchanger drainage valve coil failure E19; solenoid coil open circuit or triac blown.

On Neff dishwashers: Heat exchanger drain valve coil open circuit (nominal resistance ~900–1100 Ω), or dosage actuator thermal wax element open.

Remove left side panel. Measure resistance across heat exchanger valve solenoid (nominal ~900–1100 Ω; replace valve if open circuit). Check dispenser coil. Press and hold Start button for 3 seconds until '0:01' is displayed, let appliance evacuate sump completely, then switch off.

E19

Washing Machine

Heating Element, Thermostat & Safety Fuse

Neff N 50 / N 70 / N 90 Efficient SilentDrive washing machine: Heating timeout error E19; wash water temperature fails to increase by at least 4°C within 15 minutes of heating.

On Neff washers: Open-circuit wash heating element (nominal ~24–28 Ω), open thermal fuse on element flange, or defective heater relay on main control PCB.

Disconnect power. Measure resistance across tubular heater terminals (nominal 24–28 Ω; open if infinite). Check heater relay 12V DC coil on PCB. Turn selector to 6 o'clock position, press and hold Spin Speed reduction key, turn selector to 7 o'clock, release key, turn to Off.

E20

Dishwasher

Drive Motor, Inverter & Tachometer Sensor

Neff N 50 / N 70 / N 90 Chef 70° & DoorOpen Assist dishwasher: Circulation pump BLDC winding resistance fault E20; phase impedance imbalance or open coil detected by inverter.

On Neff dishwashers: Open or shorted winding in 3-phase BLDC heat pump motor, moisture ingress in motor plug, or inverter driver failure.

Disconnect power. Measure 3-phase motor winding resistances between pins 1-2, 2-3, 1-3 on heat pump motor (nominal ~88 Ω ± 5% across all 3 phases). Press and hold Start button for 3 seconds until '0:01' is displayed, let appliance evacuate sump completely, then switch off.

E20

Refrigerator / Freezer

Refrigeration Compressor, Defrost Heater & PTC Relay

Neff N 70 / N 90 FreshSafe 3 & NoFrost built-in refrigerator: Inverter compressor drive failure E20; compressor fails to start, stalls under differential pressure, or draws excessive current.

On Neff refrigerators: Mechanically locked compressor piston/bearings, shorted 3-phase BLDC stator winding, or blown inverter output IGBT bridge.

Disconnect power and remove inverter cover. Measure 3-phase compressor winding resistance across U-V, V-W, and W-U (must be identical, ~8–15 Ω each). Press and hold Alarm symbol for 5 seconds until acoustic chime stops and display returns to normal temperature.

E20

Washing Machine

NTC Temperature Sensor & Thermistor

Neff N 50 / N 70 / N 90 Efficient SilentDrive washing machine: Unexpected heating fault E20; heater energized during cold rinse or water heats up without active command.

On Neff washers: Welded heater relay contacts on power PCB, ground leakage shorting heater to chassis, or corrupted NTC analog feedback signal.

Check heater relay contacts for continuity when unpowered (must be normally open, infinite resistance). Replace power control PCB if contacts are shorted. Turn selector to 6 o'clock position, press and hold Spin Speed reduction key, turn selector to 7 o'clock, release key, turn to Off.

E21

Dishwasher

Drive Motor, Inverter & Tachometer Sensor

Neff N 50 / N 70 / N 90 Chef 70° & DoorOpen Assist dishwasher: Circulation pump motor jammed / blocked impeller E21; motor fails to start, excessive current draw shuts down inverter.

On Neff dishwashers: Broken glass fragment, olive stone, or toothpick lodged in heat pump impeller, or seized ceramic rotor bushings.

Disconnect mains. Remove sump filter and access heat pump chamber. Inspect impeller for free rotation. Clear debris or replace heat pump assembly. Press and hold Start button for 3 seconds until '0:01' is displayed, let appliance evacuate sump completely, then switch off.

E21

Refrigerator / Freezer

Refrigeration Compressor, Defrost Heater & PTC Relay

Neff N 70 / N 90 FreshSafe 3 & NoFrost built-in refrigerator: Evaporator circulation fan motor failure E21; no-frost cold air circulation blower stopped or tachometer feedback missing.

On Neff refrigerators: Ice accumulation around fan blades due to blocked drain trough, seized sleeve bearings, or defective electronic fan drive.

Remove freezer rear baffle panel. Free fan blades from ice if frozen and clear drain hole. Measure fan supply (approx. 9–12V DC) and tachometer feedback. Press and hold Alarm symbol for 5 seconds until acoustic chime stops and display returns to normal temperature.

E21

Washing Machine

Drive Motor, Inverter & Tachometer Sensor

Neff N 50 / N 70 / N 90 Efficient SilentDrive washing machine: Motor drive / rotation failure E21; drum does not rotate, drive motor fails to turn or accelerate into spin.

On Neff washers: Worn carbon brushes (< 12 mm on collector motors), open tachometer generator coil (~15–20 Ω), or BLDC motor inverter failure.

Check carbon brush length (replace if < 12 mm). Measure tachometer coil resistance (~15–20 Ω) while spinning drum. For BLDC motor, verify 3-phase resistance (4.5 Ω). Turn selector to 6 o'clock position, press and hold Spin Speed reduction key, turn selector to 7 o'clock, release key, turn to Off.

E22

Dishwasher

General System & Mechanical Integration

Neff N 50 / N 70 / N 90 Chef 70° & DoorOpen Assist dishwasher: Sump filter blocked / residual water accumulation E22; fine mesh screen clogged by grease and food residues.

On Neff dishwashers: Grease film coating micro-filter mesh, coarse food debris trapped in sump basket, or prolonged use of low-temperature Eco programs.

Twist and lift 3-piece filter system from sump. Clean thoroughly with hot water, degreasing dish soap, and stiff brush. Run 70°C Intensive maintenance cycle. Press and hold Start button for 3 seconds until '0:01' is displayed, let appliance evacuate sump completely, then switch off.

E22

Washing Machine

NTC Temperature Sensor & Thermistor

Neff N 50 / N 70 / N 90 Efficient SilentDrive washing machine: Wash tub NTC temperature sensor fault E22; thermistor signal open circuit or shorted to ground, cycle runs cold.

On Neff washers: Defective NTC thermistor inside heating element collar, corroded terminal connector, or pinched wiring harness in lower chassis.

Measure NTC resistance at 2-pin connector (nominal ~10 kΩ at 20°C, ~4.9 kΩ at 40°C, ~2.5 kΩ at 60°C). Replace NTC sensor if reading is 0 Ω or infinite. Turn selector to 6 o'clock position, press and hold Spin Speed reduction key, turn selector to 7 o'clock, release key, turn to Off.

E23

Dishwasher

Drainage System & Drain Pump

Neff N 50 / N 70 / N 90 Chef 70° & DoorOpen Assist dishwasher: Drain pump winding resistance error E23; inverter reports open circuit, phase short, or coil defect in drain motor.

On Neff dishwashers: Open or burnt winding in BLDC drain pump (nominal ~88 Ω across all 3 phases), or corroded 3-pin wiring harness connector.

Disconnect mains. Measure BLDC drain pump winding resistance (pins 1-2, 2-3, 1-3 should all read ~88 Ω ± 5%). Replace drain pump if values diverge. Press and hold Start button for 3 seconds until '0:01' is displayed, let appliance evacuate sump completely, then switch off.

E23

Tumble Dryer

General System & Mechanical Integration

Neff N 70 / N 90 Heat Pump Condenser tumble dryer: Condensate container overflow / float switch active E23; sump reservoir full, cycle pauses with water tank warning.

On Neff tumble dryers: Upper collection tank full, polystyrene float jammed by fluff in bottom sump, or condensate pump failing to empty basin.

Empty top condensate drawer. Remove rear pump cover, clean fluff from float switch mechanism, and test free movement of polystyrene float. Turn dial to position 6, hold Low Heat/Delicates button, turn dial to position 7, release and turn back to Off.

E23

Washing Machine

Drainage System & Drain Pump

Neff N 50 / N 70 / N 90 Efficient SilentDrive washing machine: AquaStop base float switch activated E23; water leak detected in bottom pan, safety drain pump runs continuously.

On Neff washers: Water leak from cracked tub bellows gasket, loose hose clamp on drain pump, split inlet dispenser hose, or tub seam leak.

Disconnect mains. Tilt washer backwards 45° to drain base tray and drop float switch. Locate water leak source and replace ruptured hose/gasket. Turn selector to 6 o'clock position, press and hold Spin Speed reduction key, turn selector to 7 o'clock, release key, turn to Off.

E24

Dishwasher

Drainage System & Drain Pump

Neff N 50 / N 70 / N 90 Chef 70° & DoorOpen Assist dishwasher: Drain hose obstruction / siphon block E24; appliance fails to expel waste water, pump stops after initial 1-minute test.

On Neff dishwashers: Kinked drain hose behind cabinet, unpunched knockout plug on new sink siphon, missing white plastic pump cover, or stuck non-return flap.

Ensure white plastic impeller cover clicks firmly into place inside sump. Disconnect drain hose from sink siphon and check for blockages. Test into bucket. Press and hold Start button for 3 seconds until '0:01' is displayed, let appliance evacuate sump completely, then switch off.

E25

Dishwasher

Drainage System & Drain Pump

Neff N 50 / N 70 / N 90 Chef 70° & DoorOpen Assist dishwasher: Drain pump impeller locked / pump cover missing E25; wastewater cannot be pumped out, standing water in tub bottom.

On Neff dishwashers: Fruit seeds, small bone fragments, or glass shards jamming drain impeller, or white impeller cover dislodged during cleaning.

Scoop out standing water. Remove filter, lever off white pump cover with teaspoon, wear gloves to clear glass/debris from impeller, snap cover back. Press and hold Start button for 3 seconds until '0:01' is displayed, let appliance evacuate sump completely, then switch off.

E25

Washing Machine

Drainage System & Drain Pump

Neff N 50 / N 70 / N 90 Efficient SilentDrive washing machine: Turbidity AquaSensor optical fault E25; infrared sensor cannot evaluate rinse water cloudiness or clarity.

On Neff washers: Heavy soap scum / detergent residue on optical prism, disconnected 3-pin harness, or damaged IR phototransistor.

Inspect optical AquaSensor mounted on sump drain hose. Clean optical glass with isopropyl alcohol. Check 5V DC supply and signal line to PCB. Turn selector to 6 o'clock position, press and hold Spin Speed reduction key, turn selector to 7 o'clock, release key, turn to Off.

E26

Dishwasher

General System & Mechanical Integration

Neff N 50 / N 70 / N 90 Chef 70° & DoorOpen Assist dishwasher: Water switch diverter valve mechanical jam E26; rotary distributor disc cannot complete rotation between spray arms.

On Neff dishwashers: Limescale crystallization or sand grain seized between diverter disc and housing, or broken drive pinion in actuator.

Access water diverter under sump. Disassemble housing, remove limescale deposits, lubricate disc seal with food-grade silicone grease, or replace diverter. Press and hold Start button for 3 seconds until '0:01' is displayed, let appliance evacuate sump completely, then switch off.

E26

Washing Machine

Water Level Pressure Switch & Air Dome

Neff N 50 / N 70 / N 90 Efficient SilentDrive washing machine: Analog pressure sensor voltage out of range E26; sensor output signal voltage drops below 0.5V DC or exceeds 3.5V DC.

On Neff washers: Blocked pressure chamber air trap, split or disconnected rubber hose, or internal piezoresistive sensor element drift.

Remove top lid. Inspect rubber hose between air trap and analog sensor. Clear pressure chamber with warm water. Measure 5V DC supply and sensor voltage. Turn selector to 6 o'clock position, press and hold Spin Speed reduction key, turn selector to 7 o'clock, release key, turn to Off.

E27

Dishwasher

General System & Mechanical Integration

Neff N 50 / N 70 / N 90 Chef 70° & DoorOpen Assist dishwasher: Mains undervoltage detected E27; AC supply voltage drops below minimum operating threshold (< 190V AC).

On Neff dishwashers: Household electrical grid overloaded by heavy appliances, thin extension cord, loose neutral terminal in socket, or utility power dip.

Plug dishwasher directly into dedicated 16A grounded wall socket (do not use extension cords). Measure AC voltage at outlet (must be 220–240V AC). Press and hold Start button for 3 seconds until '0:01' is displayed, let appliance evacuate sump completely, then switch off.

E27

Washing Machine

Electronic Control Board (PCB) & Bus Communications

Neff N 50 / N 70 / N 90 Efficient SilentDrive washing machine: Pressure sensor zero-point calibration drift E27; sensor reports residual water pressure with completely empty tub.

On Neff washers: Trapped air pressure in sensor tube due to clogged sump trap, mechanical membrane fatigue, or damaged electronic amplifier on PCB.

Disconnect pressure hose at sensor while tub is empty to equalize atmospheric pressure. Reattach hose securely with spring clamp. Replace sensor if drift persists. Turn selector to 6 o'clock position, press and hold Spin Speed reduction key, turn selector to 7 o'clock, release key, turn to Off.

E28

Dishwasher

Electronic Control Board (PCB) & Bus Communications

Neff N 50 / N 70 / N 90 Chef 70° & DoorOpen Assist dishwasher: Turbidity AquaSensor optical calibration fault E28; phototransistor cannot calibrate wash water clarity.

On Neff dishwashers: Lime or greasy film coating optical lenses in sump sensor, defective infrared emitter diode, or loose sensor harness.

Clean optical window of AquaSensor located in bottom of sump with soft cloth. Check 5V DC supply and signal wire continuity to main PCB. Press and hold Start button for 3 seconds until '0:01' is displayed, let appliance evacuate sump completely, then switch off.

E28

Washing Machine

Water Inlet Valve, Aquastop & Flowmeter

Neff N 50 / N 70 / N 90 Efficient SilentDrive washing machine: Flow sensor impulse signal missing E28; water enters soap dispenser but reed switch flowmeter counts 0 pulses.

On Neff washers: Jammed flowmeter turbine wheel (grit/scale deposit), broken reed switch capsule, or disconnected 2-pin harness to main PCB.

Locate inline flowmeter behind inlet valve. Check turbine rotation under water flow. Verify continuity and square wave pulse output with oscilloscope/multimeter. Turn selector to 6 o'clock position, press and hold Spin Speed reduction key, turn selector to 7 o'clock, release key, turn to Off.

E29

Dishwasher

Drive Motor, Inverter & Tachometer Sensor

Neff N 50 / N 70 / N 90 Chef 70° & DoorOpen Assist dishwasher: Mains supply frequency out of tolerance E29; AC grid frequency deviates beyond acceptable 50 Hz / 60 Hz window.

On Neff dishwashers: Poor quality power from backup generator, unstable inverter solar installation, or defective zero-crossing detector on main PCB.

Verify electrical power supply frequency with digital multimeter (must be 50.0 Hz ± 1 Hz). Switch appliance to stable utility grid power. Press and hold Start button for 3 seconds until '0:01' is displayed, let appliance evacuate sump completely, then switch off.

E29

Tumble Dryer

Drainage System & Drain Pump

Neff N 70 / N 90 Heat Pump Condenser tumble dryer: Condensate drain siphon / line clogged E29; self-cleaning condenser flush line or external drain hose obstructed.

On Neff tumble dryers: Sludge/lint buildup inside narrow corrugated pump hose, non-return ball valve stuck closed, or kinked external drain hose.

Disconnect corrugated drain hose from pump to tank. Flush with warm water under pressure to dislodge lint plug. Inspect non-return valve. Turn dial to position 6, hold Low Heat/Delicates button, turn dial to position 7, release and turn back to Off.

E29

Washing Machine

Water Inlet Valve, Aquastop & Flowmeter

Neff N 50 / N 70 / N 90 Efficient SilentDrive washing machine: No water inflow detected E29; inlet valves energized but pressure sensor detects zero water accumulation.

On Neff washers: Building main stopcock closed, kinked inlet hose, completely frozen fill hose in unheated laundry, or blown inlet triac.

Verify water tap is fully open and water flows freely into bucket. Ensure fill hose is unkinked and thawed. Measure 230V AC across valve coils when energized. Turn selector to 6 o'clock position, press and hold Spin Speed reduction key, turn selector to 7 o'clock, release key, turn to Off.

E30

Dishwasher

Drive Motor, Inverter & Tachometer Sensor

Neff N 50 / N 70 / N 90 Chef 70° & DoorOpen Assist dishwasher: Mains overvoltage detected E30; supply line voltage exceeds upper operating safety limit (> 265V AC).

On Neff dishwashers: Neutral wire severed in building electrical panel (floating neutral), lightning strike surge, or solar inverter voltage spike.

Disconnect appliance immediately to protect electronics. Have certified electrician inspect building neutral conductor and voltage at outlet (max 253V AC). Press and hold Start button for 3 seconds until '0:01' is displayed, let appliance evacuate sump completely, then switch off.

E31

Dishwasher

Heating Element, Thermostat & Safety Fuse

Neff N 50 / N 70 / N 90 Chef 70° & DoorOpen Assist dishwasher: Zeolith heat pump overheating safety trip E31; thermal cutout on drying container activated.

On Neff dishwashers: Blocked drying air inlet or exhaust inside tub, fan blower failed during regeneration, or water entered zeolite container.

Check drying air outlet cap in right rear corner of tub for obstructions. Measure Zeolith heater resistance (nominal ~35–45 Ω). Check thermal fuse continuity. Press and hold Start button for 3 seconds until '0:01' is displayed, let appliance evacuate sump completely, then switch off.

E31

Washing Machine

Water Level Pressure Switch & Air Dome

Neff N 50 / N 70 / N 90 Efficient SilentDrive washing machine: Maximum safety water level exceeded E31; overflow protection trips, inlet valves closed and drain pump energized.

On Neff washers: Mechanically jammed inlet solenoid valve seat, shorted inlet triac continuing to feed coil, or clogged air trap creating false pressure.

Shut off water tap. If water continues filling while unplugged, replace defective inlet valve assembly. If water stops when unplugged, replace power PCB. Turn selector to 6 o'clock position, press and hold Spin Speed reduction key, turn selector to 7 o'clock, release key, turn to Off.

E32

Tumble Dryer

General System & Mechanical Integration

Neff N 70 / N 90 Heat Pump Condenser tumble dryer: Moisture sensor conductivity circuit anomaly E32; sensor electrode strips report open circuit or permanent wet state.

On Neff tumble dryers: Fabric softener / lime scale film insulating stainless sensor electrodes, worn carbon grounding brush on drum shaft, or disconnected lead.

Clean stainless sensor bars inside front opening with white vinegar. Inspect rear drum ground contact brush and spring. Measure sensor wire continuity. Turn dial to position 6, hold Low Heat/Delicates button, turn dial to position 7, release and turn back to Off.

E32

Washing Machine

General System & Mechanical Integration

Neff N 50 / N 70 / N 90 Efficient SilentDrive washing machine: Drum unbalanced load distribution warning E32; appliance aborts final spin or reduces speed to prevent vibration damage.

On Neff washers: Single heavy item (e.g. bath mat, duvet, bathrobe) rolled into ball, underloaded drum, or worn shock absorbers allowing excessive tub sway.

Pause program, open door, redistribute laundry evenly inside drum, or add small towels to balance heavy items. Check friction damper resistance. Turn selector to 6 o'clock position, press and hold Spin Speed reduction key, turn selector to 7 o'clock, release key, turn to Off.

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Neff — Complete Error Code Catalog

158 Verified Error Codes

Server-side index of all verified manufacturer error codes for technicians and automated crawlers.

Dishwasher38

E01 E02 E03 E04 E05 E06 E07 E08 E09 E10 E11 E12 E13 E14 E15 E16 E17 E18 E19 E20 E21 E22 E23 E24 E25 E26 E27 E28 E29 E30 E31 E3000 E3100 E3200 E6101 E6900 E9001 E9210

Washing Machine48

E34 E35 E37 E38 E42 E43 E44 E47 E48 E49 E50 E57 E59 E60 E61 E67 F16 F17 F18 F19 F20 F21 F22 F23 F25 F26 F27 F28 F29 F31 F34 F35 F36 F37 F38 F42 F43 F44 F47 F48 F49 F50 F57 F59 F60 F61 F63 F67

Tumble Dryer16

E32 E36 E51 E52 E53 E54 E55 E56 E63 E71 E72 E73 E74 E75 E89 E90

Oven / Microwave19

E005 E011 E101 E104 E106 E115 E305 E310 E395 E396 E845 E5116 E5122 Er1 Er2 Er4 Er6 Er8 Key Symbol

Hob / Cooktop36

d0 d1 d2 d3 d4 d5 d6 d7 d8 d9 E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 E0513 E7015 E8207 F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 U1 U2 U3

Refrigerator / Freezer1

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