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OEM VERIFIED BENCH
OFFICIAL FAULT CODEE140
Bosch
Bosch // OFFICIAL DIAGNOSTIC BENCH

Bosch E140

OvenDrive Motor, Inverter & Tachometer Sensor
Integrated luxury convection oven and induction cooktop with illuminated touch controls
Oven

Symptom / Description

FAULT

Invert “Fault in Control IC” H 96-2

TELEMETRY // LIVESIG: FAULT_DETECTED

Root Cause

ROOT CAUSE

1. Insufficient cooling of the appliance. 2. Raft fan does not work. 3. Magnetron fan does not work. 4. Fault in the inverter. 5. Fault in the magnetron. 6. Fault on the control module

CIRCUIT // SUBSYSTEMLOGIC: ROOT_ISOLATED

Repair Instructions

UNLOCKED
1Install the appliance according to the installation instructions / Change the tangential fan / Change the magnetron fan / Check / change the inverter / Check / change the magnetron / Check / change the control board
AI diagnostic workshop engine analyzing appliance circuit schematics and error telemetry in real time
AI WORKSHOP PROTOCOL ENGINE
Direct extraction from OEM factory manuals & wiring schematics

Field Actions

DISPATCH
Need Help? Call a Certified TechnicianWorldwide Bosch Parts Finder
Electrical & Safety Protocol

Always disconnect appliance from 230V/400V mains before opening panels. Use CAT III multimeter for circuit testing.

CALIBRATED BENCH PROTOCOL // CAT III 600V

Workshop Verification & Safety Checklist

WORKSHOP VERIFICATION PROTOCOLDrive Motor, Inverter & Tachometer SensorOven / Microwave
2. Multimeter & Electrical Bench Tests (Ω)
MODE: OHMMETER (Ω)AUTO-RANGE
Precision digital multimeter probes measuring electrical resistance in Ohms on an appliance control board
CALIBRATED METROLOGY RESISTANCE BENCH (CAT III)
Nominal Resistance (Ω)
3Ω–6Ω (BLDC phase U-V-W) / 60Ω–180Ω (Tacho coil) / 1.5Ω–3.5Ω (Universal stator)NOMINAL
0 Ω (SHORT)CALIBRATED BAND∞ OL (OPEN)
▲ NOMINAL OPERATING WINDOW
Target Component:3-Phase Motor Windings / Tacho Generator / Carbon Brushes
Test Pins & Connections
PROBE (+)
PROBE (-)
Across phase pins U-V, V-W, U-W on motor harness; across tacho pins
Tolerance & Diagnostic CriteriaBLDC phase winding values must be strictly balanced within ±0.3Ω. Hand rotation generates 1V–4V AC on tacho.
1. Pre-Intervention Electrical Safety Protocols
  • !High-Voltage Safety Protocol & DC Bus: Wait at least 5 minutes after power cutoff to allow inverter DC bus capacitors (380V DC) to bleed down.
  • !Verify 0V DC across inverter filter capacitors before unplugging motor harness connectors.
  • !Keep hands clear of drive belt and pulleys during any manual rotation tng.
3. Preliminary Mechanical & Visual Checks
  • Slip off drive belt and spin drum/motor shaft by hand to check for roaring or seized ball bearings.
  • For universal motors: verify carbon brushes have at least 10mm remaining length and smooth contact faces.
  • Inspect motor suspension rubber mounts and drive belt tension/groove profile.
Perform these diagnostic steps before triggering AI Deep Search or replacing boards.Certified Workshop Routine

Frequently Asked Questions: Bosch E140

FAQ TREE
What does error code E140 mean on a Bosch appliance?

Bosch error code E140 indicates: Invert “Fault in Control IC” H 96-2.

What is the root cause of Bosch error code E140?

The primary root cause for Bosch code E140 is: 1. Insufficient cooling of the appliance. 2. Raft fan does not work. 3. Magnetron fan does not work. 4. Fault in the inverter. 5. Fault in the magnetron. 6. Fault on the control module.

How do I fix or resolve Bosch error code E140?

To resolve error code E140: Install the appliance according to the installation instructions / Change the tangential fan / Change the magnetron fan / Check / change the inverter / Check / change the magnetron / Check / change the control board

Is it safe to clear Bosch error code E140 by resetting power?

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Bosch code E140 persists, the physical component causing 1. Insufficient cooling of the appliance. 2. Raft fan does not work. 3. Magnetron fan does not work. 4. Fault in the inverter. 5. Fault in the magnetron. 6. Fault on the control module must be inspected or replaced.

How do I test electrical resistance for Bosch code E140 using a multimeter?

Set a digital multimeter to ohms (Ω). Disconnect power and test 3-Phase Motor Windings / Tacho Generator / Carbon Brushes across Across phase pins U-V, V-W, U-W on motor harness; across tacho pins. Expected nominal reading is 3Ω–6Ω (BLDC phase U-V-W) / 60Ω–180Ω (Tacho coil) / 1.5Ω–3.5Ω (Universal stator). Tolerance: BLDC phase winding values must be strictly balanced within ±0.3Ω. Hand rotation generates 1V–4V AC on tacho..

What safety protocol must be followed before servicing Bosch code E140?

Standard electrical safety protocol: 1. Disconnect 230V mains power before opening panels. 2. Verify zero voltage at test points. 3. Allow hot water or heating elements to cool below 30°C before handling.

Community Verification

COMMUNITY

Did this solution resolve the issue?

SEMANTIC KNOWLEDGE GRAPH // BOSCH

Related Bosch Oven / Microwave Error Codes

Diagnostic Link Mesh14 OEM Cross-References

Cross-referenced diagnostic codes for technicians inspecting similar component subsystems.

E141Drive Motor, Inverter & Tachometer Sensor
Inverter “Control Error” H 97
Inspect Protocol
E142Drive Motor, Inverter & Tachometer Sensor
Bosch E142: Motor drive or inverter rotation anomaly in Oven / Microwave; drum/motor fails t...
Inspect Protocol
E143Drive Motor, Inverter & Tachometer Sensor
Pulses from the inverter H 99
Inspect Protocol
E144Electronic Control Board (PCB) & Bus Communications
Plausibility check (Double ovens --> Oven cavity 1)
Inspect Protocol
E244Electronic Control Board (PCB) & Bus Communications
Plausibility check (Double ovens --> Oven cavity 2)
Inspect Protocol
E300Electronic Control Board (PCB) & Bus Communications
Unsatisfactory baking result or functions of the buttons do not correspond, appliance is in ...
Inspect Protocol
E303Electronic Control Board (PCB) & Bus Communications
The control board temperature is too high
Inspect Protocol
E305Electronic Control Board (PCB) & Bus Communications
Oven light flashes or the operating module is without function. The display flickers, and di...
Inspect Protocol
E309Electronic Control Board (PCB) & Bus Communications
Bosch E309: Operational cycle fault detected during Oven / Microwave program execution.
Inspect Protocol
E310Electronic Control Board (PCB) & Bus Communications
Failure in data in memory
Inspect Protocol
E312NTC Temperature Sensor & Thermistor
Bosch E312: NTC temperature sensor signal out of range (open or short circuit) in Oven / Mic...
Inspect Protocol
E344Electronic Control Board (PCB) & Bus Communications
Bosch E344: Operational cycle fault detected during Oven / Microwave program execution.
Inspect Protocol
E395Electronic Control Board (PCB) & Bus Communications
Bosch E395: Operational cycle fault detected during Oven / Microwave program execution.
Inspect Protocol
E396Electronic Control Board (PCB) & Bus Communications
Electronic control board EEPROM non-volatile memory read communication error.
Inspect Protocol
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