Access our premium database of error codes, common faults, and professional repair solutions for Bosch appliances.
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: High water inlet pressure / overflow risk E17; flow rate into heat exchanger exceeds maximum allowable speed.
On Bosch dishwashers: Household water mains pressure > 10 bar (1.0 MPa), water hammer...
Partially close household supply tap to throttle water intake. Install a water pressure...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Water inlet timeout alarm E17; appliance fails to reach required wash level within 5 minutes of filling.
On Bosch washers: Closed water supply tap, kinked fill hose, clogged mesh filter in...
Verify water tap pressure (min 10 L/min bucket test). Unscrew hose and clean inlet filter...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Low water flow inlet timeout E18; minimum water volume not achieved within programmed filling time window.
On Bosch dishwashers: Water supply tap barely open, clogged wire mesh filter inside...
Verify bucket test at tap (must deliver > 10 L/min). Clean inlet mesh filter. Straighten...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Draining timeout failure E18; washer fails to evacuate tub wastewater within programmed 6-minute window.
On Bosch washers: Coins, hairpins, or lint clogged in coin trap filter, kinked drain hose,...
Drain residual water via emergency drain tube. Unscrew pump filter cap and clear debris....
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Dispenser actuator / heat exchanger drainage valve coil failure E19; solenoid coil open circuit or triac blown.
On Bosch dishwashers: Heat exchanger drain valve coil open circuit (nominal resistance...
Remove left side panel. Measure resistance across heat exchanger valve solenoid (nominal...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Heating timeout error E19; wash water temperature fails to increase by at least 4°C within 15 minutes of heating.
On Bosch washers: Open-circuit wash heating element (nominal ~24–28 Ω), open thermal fuse...
Disconnect power. Measure resistance across tubular heater terminals (nominal 24–28 Ω; open...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Circulation pump BLDC winding resistance fault E20; phase impedance imbalance or open coil detected by inverter.
On Bosch dishwashers: Open or shorted winding in 3-phase BLDC heat pump motor, moisture...
Disconnect power. Measure 3-phase motor winding resistances between pins 1-2, 2-3, 1-3 on...
Bosch Serie 4 / Serie 6 / Serie 8 VitaFresh pro 0°C NoFrost Refrigerator: Inverter compressor drive failure E20; compressor fails to start, stalls under differential pressure, or draws excessive current.
On Bosch refrigerators: Mechanically locked compressor piston/bearings, shorted 3-phase...
Disconnect power and remove inverter cover. Measure 3-phase compressor winding resistance...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Unexpected heating fault E20; heater energized during cold rinse or water heats up without active command.
On Bosch washers: Welded heater relay contacts on power PCB, ground leakage shorting heater...
Check heater relay contacts for continuity when unpowered (must be normally open, infinite...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Circulation pump motor jammed / blocked impeller E21; motor fails to start, excessive current draw shuts down inverter.
On Bosch dishwashers: Broken glass fragment, olive stone, or toothpick lodged in heat pump...
Disconnect mains. Remove sump filter and access heat pump chamber. Inspect impeller for...
Bosch Serie 4 / Serie 6 / Serie 8 VitaFresh pro 0°C NoFrost Refrigerator: Evaporator circulation fan motor failure E21; no-frost cold air circulation blower stopped or tachometer feedback missing.
On Bosch refrigerators: Ice accumulation around fan blades due to blocked drain trough,...
Remove freezer rear baffle panel. Free fan blades from ice if frozen and clear drain hole....
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Motor drive / rotation failure E21; drum does not rotate, drive motor fails to turn or accelerate into spin.
On Bosch washers: Worn carbon brushes (< 12 mm on collector motors), open tachometer...
Check carbon brush length (replace if < 12 mm). Measure tachometer coil resistance (~15–20...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Sump filter blocked / residual water accumulation E22; fine mesh screen clogged by grease and food residues.
On Bosch dishwashers: Grease film coating micro-filter mesh, coarse food debris trapped in...
Twist and lift 3-piece filter system from sump. Clean thoroughly with hot water, degreasing...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Wash tub NTC temperature sensor fault E22; thermistor signal open circuit or shorted to ground, cycle runs cold.
On Bosch washers: Defective NTC thermistor inside heating element collar, corroded terminal...
Measure NTC resistance at 2-pin connector (nominal ~10 kΩ at 20°C, ~4.9 kΩ at 40°C, ~2.5 kΩ...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Drain pump winding resistance error E23; inverter reports open circuit, phase short, or coil defect in drain motor.
On Bosch dishwashers: Open or burnt winding in BLDC drain pump (nominal ~88 Ω across all 3...
Disconnect mains. Measure BLDC drain pump winding resistance (pins 1-2, 2-3, 1-3 should all...
Bosch Serie 6 / Serie 8 / HomeProfessional AutoClean SelfCleaning Condenser: Condensate container overflow / float switch active E23; sump reservoir full, cycle pauses with water tank warning.
On Bosch tumble dryers: Upper collection tank full, polystyrene float jammed by fluff in...
Empty top condensate drawer. Remove rear pump cover, clean fluff from float switch...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: AquaStop base float switch activated E23; water leak detected in bottom pan, safety drain pump runs continuously.
On Bosch washers: Water leak from cracked tub bellows gasket, loose hose clamp on drain...
Disconnect mains. Tilt washer backwards 45° to drain base tray and drop float switch....
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Drain hose obstruction / siphon block E24; appliance fails to expel waste water, pump stops after initial 1-minute test.
On Bosch dishwashers: Kinked drain hose behind cabinet, unpunched knockout plug on new sink...
Ensure white plastic impeller cover clicks firmly into place inside sump. Disconnect drain...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Drain pump impeller locked / pump cover missing E25; wastewater cannot be pumped out, standing water in tub bottom.
On Bosch dishwashers: Fruit seeds, small bone fragments, or glass shards jamming drain...
Scoop out standing water. Remove filter, lever off white pump cover with teaspoon, wear...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Turbidity AquaSensor optical fault E25; infrared sensor cannot evaluate rinse water cloudiness or clarity.
On Bosch washers: Heavy soap scum / detergent residue on optical prism, disconnected 3-pin...
Inspect optical AquaSensor mounted on sump drain hose. Clean optical glass with isopropyl...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Water switch diverter valve mechanical jam E26; rotary distributor disc cannot complete rotation between spray arms.
On Bosch dishwashers: Limescale crystallization or sand grain seized between diverter disc...
Access water diverter under sump. Disassemble housing, remove limescale deposits, lubricate...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Analog pressure sensor voltage out of range E26; sensor output signal voltage drops below 0.5V DC or exceeds 3.5V DC.
On Bosch washers: Blocked pressure chamber air trap, split or disconnected rubber hose, or...
Remove top lid. Inspect rubber hose between air trap and analog sensor. Clear pressure...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Mains undervoltage detected E27; AC supply voltage drops below minimum operating threshold (< 190V AC).
On Bosch dishwashers: Household electrical grid overloaded by heavy appliances, thin...
Plug dishwasher directly into dedicated 16A grounded wall socket (do not use extension...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Pressure sensor zero-point calibration drift E27; sensor reports residual water pressure with completely empty tub.
On Bosch washers: Trapped air pressure in sensor tube due to clogged sump trap, mechanical...
Disconnect pressure hose at sensor while tub is empty to equalize atmospheric pressure....
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Turbidity AquaSensor optical calibration fault E28; phototransistor cannot calibrate wash water clarity.
On Bosch dishwashers: Lime or greasy film coating optical lenses in sump sensor, defective...
Clean optical window of AquaSensor located in bottom of sump with soft cloth. Check 5V DC...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Flow sensor impulse signal missing E28; water enters soap dispenser but reed switch flowmeter counts 0 pulses.
On Bosch washers: Jammed flowmeter turbine wheel (grit/scale deposit), broken reed switch...
Locate inline flowmeter behind inlet valve. Check turbine rotation under water flow. Verify...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Mains supply frequency out of tolerance E29; AC grid frequency deviates beyond acceptable 50 Hz / 60 Hz window.
On Bosch dishwashers: Poor quality power from backup generator, unstable inverter solar...
Verify electrical power supply frequency with digital multimeter (must be 50.0 Hz ± 1 Hz)....
Bosch Serie 6 / Serie 8 / HomeProfessional AutoClean SelfCleaning Condenser: Condensate drain siphon / line clogged E29; self-cleaning condenser flush line or external drain hose obstructed.
On Bosch tumble dryers: Sludge/lint buildup inside narrow corrugated pump hose, non-return...
Disconnect corrugated drain hose from pump to tank. Flush with warm water under pressure to...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: No water inflow detected E29; inlet valves energized but pressure sensor detects zero water accumulation.
On Bosch washers: Building main stopcock closed, kinked inlet hose, completely frozen fill...
Verify water tap is fully open and water flows freely into bucket. Ensure fill hose is...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Mains overvoltage detected E30; supply line voltage exceeds upper operating safety limit (> 265V AC).
On Bosch dishwashers: Neutral wire severed in building electrical panel (floating neutral),...
Disconnect appliance immediately to protect electronics. Have certified electrician inspect...
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