Access our premium database of error codes, common faults, and professional repair solutions for Bosch appliances.
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Pyrolytic door lock mechanism microswitch 2 high contact resistance E396; unlocked position contact signal degraded (> 1 Ω).
On Bosch ovens: Carbonized or pitted contacts on microswitch 2, grease ingress into switch...
Access door lock unit on top of cavity. Measure contact resistance across microswitch 2...
Bosch E397: Operational cycle fault detected during Oven / Microwave program execution.
1. Instantaneous DBus2 communication error due to an EMC error / 2. Bad mains connection...
Press the clock key / Check the DBus2 mains connection / Change the display board
Bosch E398: Operational cycle fault detected during Oven / Microwave program execution.
1. Instantaneous DBus2 communication error due to an EMC error / 2. Bad mains connection...
1. Press the clock button to reset or power cycle the appliance. 2. Disconnect power and...
Bosch E399: Operational cycle fault detected during Oven / Microwave program execution.
1. Instantaneous DBus2 communication error due to an EMC error / 2. Bad mains connection...
Press the clock key / Check the DBus2 mains connection / Change the display board
Bosch Serie 6 / Serie 8 FlexInduction & PerfectFry Induction Cooktop: Touch slider interface synchronization timeout E0513; capacitive UI fails handshake with master power module.
On Bosch hobs: Clock jitter on UI communication line, damaged noise suppression filter...
Check wiring loom between touch slider and power module for continuity and electromagnetic...
Core temperature probe (meat thermometer) circuit fault detected on the oven.
Corroded or loose plug connector, wire break in the harness, defective core temperature...
Disconnect mains power, inspect the plug socket and wiring harness between the probe jack...
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Combi-steam boiler water level optical sensor calibration failure E845; steam generator cannot verify boiler water level.
On Bosch ovens: Heavy lime scale coating optical refraction prism inside steam generator,...
Run automatic oven descaling program with recommended descaling liquid. Remove boiler unit...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Home Connect Wi-Fi communication bus timeout E3000; network communication module fails to handshake with main control board.
On Bosch dishwashers: Firmware update corruption on Wi-Fi module, intermittent ribbon cable...
Power cycle appliance at breaker for 2 minutes. Inspect internal ribbon harness linking...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Zeolith container NTC sensor open circuit E3100; electronic controller cannot monitor zeolite drying bed temperature.
On Bosch dishwashers: Broken lead wire to Zeolith container NTC sensor, corrosion on sensor...
Measure Zeolith NTC sensor resistance across terminals (nominal ~10 kΩ at 25°C). Inspect...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Zeolith regeneration heater auxiliary thermostat open E3200; secondary safety limit switch tripped on drying container.
On Bosch dishwashers: Air circulation blower failed while Zeolith heater was energized,...
Inspect Zeolith blower motor and verify free rotation. Test continuity of auxiliary thermal...
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Combi-microwave inverter magnetron heater open circuit E5116; magnetron filament open or high-voltage inverter output missing.
On Bosch ovens: Burned-out filament in 2M261 magnetron tube (nominal < 0.2 Ω), blown...
DANGER: Disconnect mains and discharge high-voltage capacitor. Measure magnetron filament...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Drain safety monitoring level anomaly E6101; electronic controller detects incorrect pressure signal during water evacuation.
On Bosch dishwashers: Clogged pressure chamber air hose in sump, non-return flap stuck...
Clean sump pressure transducer chamber using warm water syringe. Inspect rubber non-return...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Main inverter power module hardware fault E6900; internal DC bus voltage regulator or gate driver IC failure.
On Bosch dishwashers: Blown switch-mode power supply (SMPS) controller chip, failed DC bus...
Disconnect mains power. Remove and inspect power module located in lower base. Check for...
Bosch Serie 6 / Serie 8 FlexInduction & PerfectFry Induction Cooktop: FlexInduction zone bridging sensor array communication error E7015; Lin-bus packet drop across induction coil nodes.
On Bosch hobs: Interrupted Lin-bus data harness between left and right coil arrays,...
Disconnect power. Verify 12V supply and single-wire Lin-bus continuity (< 1 Ω) between all...
Bosch Serie 6 / Serie 8 FlexInduction & PerfectFry Induction Cooktop: Induction inverter IGBT desaturation fault E8207; power transistor over-current trip triggered within microseconds.
On Bosch hobs: Short circuit inside induction heating coil windings, damaged IGBT driver...
Isolate hob from mains. Measure coil winding resistance (~0.3–0.6 Ω, never 0.0 Ω). Test...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Low voltage DC power rail mismatch E9001; internal secondary DC voltage rails (+12V / +5V) outside allowable regulation window.
On Bosch dishwashers: Dried electrolytic filter capacitors in low-voltage section,...
Disconnect sensor connectors one by one to isolate shorted rail. Measure +5V DC and +12V DC...
Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Water hardness ion-exchanger optical sensor anomaly E9210; salt detection photodiode fails to calibrate transparency.
On Bosch dishwashers: Air bubbles or salt residue crust covering optical sensor lenses on...
Stir salt container with wooden spoon to dislodge salt bridges and air bubbles. Run a rinse...
Bosch EEEE: Operational cycle fault detected during Hob / Cooktop program execution.
Component fatigue, sensor feedback out of tolerance, wiring harness connector...
1. Disconnect 230V mains power for 3 minutes. 2. Inspect wire harness and edge connectors...
Incorrect module combination detected, no further operation possible.
The control and power module recognizes an incompatible variant of the operating and...
Install a compatible control and display module combination.
Temperature sensor interruption detected, oven does not heat, fans turn on.
Interruption of the temperature sensor PT500 (e.g., unplugged or cable break).
Check and reconnect the temperature sensor, or replace if broken. The error clears...
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Cavity PT1000 thermocouple sensor disconnected / open circuit Er1; heating program aborted immediately on safety interlock.
On Bosch ovens: Sensor harness unplugged from rear of cavity, damaged silicone wire...
Check sensor plug behind rear backplate. Measure PT1000 resistance (nominal 1000 Ω at 0°C,...
Incorrect mains connection, continuous buzzer tone, mains connection incorrect
Connection to voltages over 270 V
Correct mains connection, avoid voltages over 270 V
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Mains connection frequency / phase wiring inversion Er2; power input phase or neutral connection incorrect.
On Bosch ovens: Neutral and phase wire swapped at terminal block, missing copper jumper...
Verify wiring at rear terminal block with multimeter (L to N must be 230V AC; L to PE must...
Electronics overheated (> 100 °C), no heating, display darker, cooling fan on
Electronics overheated (> 100 °C)
Allow to cool down, cooling fan automatically activated
Temperature sensor short circuit detected, oven does not heat.
Short circuit of the temperature sensor PT500.
Check and replace the temperature sensor. The error clears automatically after repeated...
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Electronic module compartment overheating Er4; thermal sensor on control board detects ambient temperature > 80°C.
On Bosch ovens: Tangential cooling fan not operating, blocked ventilation slots above oven...
Allow oven to cool down with door open. Verify tangential cooling fan runs when power is...
No clock function, no function in program position 'P'
Connection X7 to program module interrupted
Check/repair connection X7 to program module
Oven door does not lock, pyrolysis operation is no longer possible.
The oven does not lock (e.g., defective locking unit) even after the specified number of...
Check, repair, or replace the locking unit.
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Pyrolytic door lock mechanism fault Er6; lock motor fails to lock or unlock door latch within 30-second timeout.
On Bosch ovens: Stripped drive gear inside lock motor, damaged microswitch contact lever,...
Inspect door latch assembly above cavity. Test 230V AC drive motor winding (~1.8–2.2 kΩ)....
The oven door fails to unlock and normal cooking operation is blocked.
The motorized door latch mechanism failed to release the lock after the maximum number of...
Allow the oven cavity to cool below 50°C, disconnect mains power, inspect the door latch...
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