Access our premium database of error codes, common faults, and professional repair solutions for Bosch appliances.
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: No water inflow detected F29; 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 / HomeProfessional EcoSilence Drive: Maximum safety water level exceeded F31; overflow protection trips, inlet valves closed and drain pump energized.
On Bosch washers: Mechanically jammed inlet solenoid valve seat, shorted inlet triac...
Shut off water tap. If water continues filling while unplugged, replace defective inlet...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Door interlock failed to lock F34; solenoid pulse sent but lock mechanism fails to engage or confirm locked contact.
On Bosch washers: Jammed lock slider mechanism, broken bimetal / solenoid lock coil, bent...
Inspect door latch alignment and hinge tightness. Test door lock mechanism resistance...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Door interlock failed to unlock F35; door remains locked at cycle end, unlock pulse fails to release mechanism.
On Bosch washers: Mechanically jammed slider inside door latch, high tub water level...
Pull emergency manual door release strap inside bottom filter flap. Check for standing...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Door interlock sensing circuit fault F36; feedback line to microcontroller remains inconsistent with lock driver state.
On Bosch washers: Burnt SMD sense resistor on control board, high contact resistance on...
Disconnect mains power. Measure resistance across door interlock switch contacts. Inspect...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: NTC sensor resistance open or high deviation F37; temperature value reads unrealistic cold (<-10°C) during wash.
On Bosch washers: Internal fracture in NTC ceramic bead, broken wire in lower wiring loom...
Measure NTC resistance directly at heater terminals (nominal ~10 kΩ at 20°C, ~4.9 kΩ at...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: NTC temperature sensor short-circuit fault F38; sensor lines shorted together or to ground, reading > 120°C.
On Bosch washers: Melted wire insulation chafing against metal tub frame, internal...
Measure NTC resistance (must NOT be 0 Ω or < 500 Ω at room temperature). Inspect wiring for...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Uncontrolled motor runaway speed error F42; drive motor revs instantly to maximum RPM without speed ramping control.
On Bosch washers: Shorted motor control triac on power module, defective optocoupler gate...
Inspect motor tail shaft to ensure tachometer magnet is firmly threaded. Test motor triac...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Motor stalled / drum rotation mechanically locked F43; drive motor energized but drum cannot rotate.
On Bosch washers: Foreign object (bra underwire, coin, sock) jammed between inner drum and...
Disconnect mains. Rotate drum by hand to check for stiffness. Remove heating element to...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: No bidirectional motor rotation F44; drum only turns in one direction during wash tumble, reversing relay stuck.
On Bosch washers: Welded contacts or defective coil on motor reversing relay on power...
Inspect motor reversing relays on control board. Measure coil resistance of both reversing...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Motor inverter power module (IPM) overtemperature F47; thermal sensor on aluminum heatsink trips thermal shutdown.
On Bosch washers: Severe drum overload, high ambient temperature, dried thermal paste...
Allow inverter module to cool for 30 minutes. Reduce laundry load. Inspect aluminum...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Inverter DC bus undervoltage detected F48; rectified high-voltage DC rail drops below minimum threshold (< 200V DC).
On Bosch washers: Severe AC mains voltage dip, degraded DC bus bulk electrolytic...
Check mains voltage at wall socket under load (> 207V AC). Measure DC bus voltage across...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Inverter DC bus overvoltage detected F49; regenerated motor braking energy or AC mains surge exceeds safety limit (> 400V DC).
On Bosch washers: Heavy out-of-balance drum deceleration dumping excessive back-EMF, open...
Check mains line voltage. Measure braking dissipation circuit components on inverter board....
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: 3-phase BLDC motor drive hardware fault F50; inverter bridge reports phase current imbalance or shorted IGBT.
On Bosch washers: Shorted phase winding in permanent magnet brushless motor, damaged motor...
Disconnect motor plug. Measure 3-phase winding resistances between U-V, V-W, U-W (must be...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Inverter serial D-Bus communication lost F57; main control module loses serial data link to motor inverter module.
On Bosch washers: Broken or disconnected communication wiring harness between upper and...
Inspect 3-wire communication harness linking main PCB to inverter module. Verify 230V AC...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: 3D Hall acceleration sensor signal missing F59; tub motion sensor fails to report 3-axis vibration data during spin.
On Bosch washers: Loose or unplugged connector on 3D sensor mounted on outer tub, damaged...
Remove top lid. Inspect 3D sensor bolted to top edge of outer plastic tub. Verify 5V DC...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Flow sensor flow rate out of calibrated bounds F60; discrepancy between flowmeter pulse frequency and pressure rise.
On Bosch washers: Partially seized flow turbine wheel, partially blocked pressure switch...
Inspect inline flowmeter and clean turbine chamber. Clean pressure switch air trap and...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Abnormal door lock feedback signal F61; door interlock reports unexpected state changes during high-speed rotation.
On Bosch washers: Loose door hinge causing strike hook vibration, pitting on internal...
Tighten door hinge mounting screws on front panel. Check harness plug fit on door...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Functional safety processor watchdog trip F63; internal CPU self-test parity or RAM execution error detected on main PCB.
On Bosch washers: Electrostatic discharge (ESD), corrupted EEPROM memory registers,...
Power down machine at mains for 5 minutes. Inspect power module for ruptured electrolytic...
Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Configuration variant coding error F67; EEPROM variant data mismatch between user interface and power module.
On Bosch washers: Unprogrammed replacement control board installed, corrupted model variant...
Access service mode to enter exact variant coding number from machine rating plate (E-Nr)....
Serial data bus communication fault between the cooktop control unit and the display module.
Interrupted or corrupted serial communication between the hob power board and the user...
Disconnect mains power, inspect the communication harness between the hob control unit and...
After the flash fires, "H" appears on the display
Mains power was not reset after flashing. The device is in the factory test program.
1. Disconnect 230V mains power for 3 minutes. 2. Inspect wire harness and edge connectors...
Bosch RRR: Operational cycle fault detected during Oven / Microwave program execution.
An operating mode was active during a power interruption
Switch off the device and reset the function
Safety shutdown / Operating time limitation
Operating time limit reached for cooktops and oven
Allow to cool down, reset operation
Bosch Serie 6 / Serie 8 FlexInduction & PerfectFry Induction Cooktop: Severe connection wiring fault U1; 400V line-to-line voltage applied without neutral reference (missing neutral).
On Bosch hobs: Cooktop wired to 400V 3-phase supply with disconnected or loose blue neutral...
IMMEDIATELY switch off main breaker! Risk of PCB destruction. Verify terminal bridge...
Bosch Serie 6 / Serie 8 FlexInduction & PerfectFry Induction Cooktop: Phase imbalance voltage anomaly U2; differential voltage between L1 and L2 lines exceeds 40V under active cooking load.
On Bosch hobs: Unequal line drop on undersized distribution cable, defective phase selector...
Measure voltage of L1-N and L2-N simultaneously with cooktop running at power level 9 on...
Bosch Serie 6 / Serie 8 FlexInduction & PerfectFry Induction Cooktop: DC bus voltage ripple excessive U3; rectified DC link voltage exhibits ripple voltage > 15% under induction load.
On Bosch hobs: Dried out DC bus smoothing filter capacitors (electrolyte leakage) or...
Disconnect power. Discharge DC bus. Check ESR of 400V DC filter capacitors on power board....
U400 displayed statically, continuous loud signal
Incorrect connection of the cooktop to 400V instead of 230V, internal wiring error, or...
Immediately disconnect the cooktop from the mains, correct wiring. Ensure mains voltage...
Digital clock display flashing 00:00; oven heating functions locked.
Mains power interruption or first electrical installation cleared electronic clock time memory.
Set digital clock time. Press Clock/Timer button, adjust current hour and minutes with...
Error in the Aquasensor system (Error in Aquasensor system)
Displayed even if no sensor is present.
1. Disconnect 230V mains power for 3 minutes. 2. Inspect wire harness and edge connectors...
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