Access our premium database of error codes, common faults, and professional repair solutions for Bosch appliances.
Bosch Serie 6 / Serie 8 / HomeProfessional AutoClean SelfCleaning Condenser: Compressor discharge temperature NTC sensor error E71; sensor resistance open, shorted, or out of calibration range.
On Bosch tumble dryers: Broken lead wire to compressor discharge line sensor, defective NTC...
Measure discharge NTC resistance (nominal ~20 kΩ at 25°C, ~6 kΩ at 50°C). Verify thermal...
Bosch Serie 6 / Serie 8 / HomeProfessional AutoClean SelfCleaning Condenser: Evaporator NTC defrost sensor failure E72; temperature sensor on heat pump evaporator coil open or shorted.
On Bosch tumble dryers: Corrosion from condensate moisture on sensor pins, pinched lead...
Measure evaporator NTC resistance (nominal ~10 kΩ at 25°C, ~28 kΩ at 0°C). Check wiring...
Bosch Serie 6 / Serie 8 / HomeProfessional AutoClean SelfCleaning Condenser: Condenser NTC sensor fault E73; temperature sensor on refrigerant condenser coil signal open or short-circuit.
On Bosch tumble dryers: Dislodged sensor clip on condenser copper bend, open lead wire in...
Measure condenser NTC sensor resistance (nominal ~10 kΩ at 25°C, ~3.6 kΩ at 50°C). Check...
Bosch Serie 6 / Serie 8 / HomeProfessional AutoClean SelfCleaning Condenser: Process air duct NTC sensor error E74; temperature thermistor in front air duct open or shorted.
On Bosch tumble dryers: Fluff accumulation insulating sensor tip, broken wire in door frame...
Remove front lint filter housing. Clean NTC sensor tip of lint. Measure resistance (nominal...
Bosch Serie 6 / Serie 8 / HomeProfessional AutoClean SelfCleaning Condenser: Ambient temperature thermistor out of range E75; room temperature sensor reads outside safe operating envelope (< 5°C or > 40°C).
On Bosch tumble dryers: Dryer located in unheated garage or winter porch (< 5°C), direct...
Ensure ambient room temperature is between 10°C and 35°C for heat pump operation. Measure...
Bosch Serie 6 / Serie 8 / HomeProfessional AutoClean SelfCleaning Condenser: Display UI to power module communication error E89; console display lost serial communication link with base power board.
On Bosch tumble dryers: Disconnected or pinched multiconductor ribbon cable, oxidised edge...
Remove top lid and front console. Re-seat ribbon cable connectors on both display and power...
Bosch Serie 6 / Serie 8 / HomeProfessional AutoClean SelfCleaning Condenser: Variant coding / configuration error E90; electronic control boards cannot reconcile programmed appliance variant parameters.
On Bosch tumble dryers: Replacement PCB installed without model coding, corrupted EEPROM...
Access service program to input correct variant code matching rating plate (E-Nr). If board...
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Cavity temperature sensor (PT1000) open circuit E101; main controller loses cavity temperature feedback, heating shuts down.
On Bosch ovens: Platinum PT1000 sensor wire snapped inside rear insulation blanket,...
Disconnect power. Remove rear cover panel. Measure PT1000 resistance across sensor plug...
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Multi-point core meat temperature probe fault E104; probe socket shorted or temperature sensing channels inconsistent.
On Bosch ovens: Grease/moisture ingress into side cavity jack socket, damaged multi-core...
Unplug core probe. Inspect internal cavity jack socket and clean with electrical solvent....
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Tangential cooling fan Hall sensor feedback missing E106; cooling blower fails to turn or tachometer feedback absent.
On Bosch ovens: Jammed tangential cross-flow blower wheel, open motor winding (~120–160 Ω),...
Disconnect mains. Remove top panel. Ensure cross-flow fan spins smoothly. Measure motor...
The door does not open because it is locked. The display shows "Oven not unlocked".
A door lock produced up to FD9103 had geometry that caused the hook to rub against the door...
Check if there is blocking of the lock and support of the lock; Motor lock: connection and...
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Cavity high-limit safety temperature trip E115; oven temperature exceeds maximum safety limit (> 350°C), heating disabled.
On Bosch ovens: Welded heating element relay on power PCB keeping elements continuously...
Allow oven to cool completely. Test power board relays for welded contacts when...
Inverter temperature (IGBT) is three times higher
Inverter overheating (T thermistor > 75°C); Insufficient cooling of the device;...
Consult program test 12 “inverter overheating”; Mount the appliance seal the installation /...
Microwave inverter IGBT power transistor over-temperature safety shutdown.
Inverter cooling fan blocked or inoperative, obstructed magnetron air ventilation duct,...
1. Isolate 230V power. 2. Clean air inlet vents and cooling duct around magnetron and...
Inverter “Connector Error” H 95
Fuse triggered / bad contact; Bad plug connection (contact corroded / loose); Door switch...
Check error F18; inspect the inverter wiring harness and power supply voltage; test the...
Invert “Fault in Control IC” H 96-1
1. Insufficient cooling of the appliance. 2. Raft fan does not work. 3. Magnetron fan does...
Install the appliance according to the installation instructions / Change the tangential...
Invert “Fault in Control IC” H 96-2
1. Insufficient cooling of the appliance. 2. Raft fan does not work. 3. Magnetron fan does...
Install the appliance according to the installation instructions / Change the tangential...
Inverter “Control Error” H 97
1. Insufficient cooling of the appliance. 2. Raft fan does not work. 3. Magnetron fan does...
Install the appliance according to the installation manual. Replace the rafter ventilation....
Bosch E142: Motor drive or inverter rotation anomaly in Oven / Microwave; drum/motor fails to spin at target RPM.
Insufficient cooling of the device; Refrigeration fan within the country; Magnetron fan...
Assemble the device according to the installation/assembly instructions; Refrigeration fan...
Pulses from the inverter H 99
1. Inverter fault / 2. Control board fault
Check / change the inverter / Check / change the control board
Plausibility check (Double ovens --> Oven cavity 1)
Parameter error in the control module
1. Disconnect 230V mains power for 3 minutes. 2. Inspect wire harness and edge connectors...
Plausibility check (Double ovens --> Oven cavity 2)
Parameter error in the control module
1. Disconnect 230V mains power for 3 minutes. 2. Inspect wire harness and edge connectors...
Unsatisfactory baking result or functions of the buttons do not correspond, appliance is in "Safety mode", buttons are not functioning, or the heating curve is no longer optimum. Also linked to steam/water/fumes entering electronics.
Incorrect version coding of the operating module software, which defines button functions...
Set the correct version code using the customer service test programme (Test 5). Switch the...
The control board temperature is too high
1. Insufficient cooling of the appliance. 2. Cooling fan does not work. 3. Magnetron fan...
Install the appliance according to the installation instructions / Change the tangential...
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Internal serial bus communication loss E305; display UI console loses data link to base power supply module.
On Bosch ovens: Disconnected multiconductor flat ribbon harness, oxidised connector...
Disconnect mains. Re-seat communication ribbon harness firmly between display board and...
Bosch E309: Operational cycle fault detected during Oven / Microwave program execution.
Internal failure of the control module
1. Disconnect 230V mains power for 3 minutes. 2. Inspect wire harness and edge connectors...
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Pyrolytic door lock mechanism microswitch 1 stuck open E310; door lock motor drives but fails to confirm locked position.
On Bosch ovens: Worn latch cam lever, broken internal spring in door lock mechanism, or...
Disconnect power. Remove top lid to access door lock motor above cavity. Test microswitch 1...
Bosch E312: NTC temperature sensor signal out of range (open or short circuit) in Oven / Microwave.
NTC south control module fault
1. Disconnect 230V mains power. 2. Unplug NTC thermistor harness connector. 3. Measure NTC...
Bosch E344: Operational cycle fault detected during Oven / Microwave program execution.
Control board parameter fault
Replace the control module and display module
Bosch Serie 6 / Serie 8 4D Hotair & EcoClean Direct Pyrolytic Oven: Pyrolytic door lock motor drive triac short-circuit E395; latch motor continually powered or stalled on mechanical stop.
On Bosch ovens: Shorted synchronous motor winding drawing excessive current, or SMD driver...
Measure pyrolytic lock motor winding resistance (nominal ~1.8–2.2 kΩ; shorted if < 100 Ω)....
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