OEM VERIFIED BENCH

OFFICIAL FAULT CODEE104

Bosch // OFFICIAL DIAGNOSTIC BENCH

Bosch E104

OvenNTC Temperature Sensor & Thermistor

Oven

Symptom / Description

FAULT

Short circuit oven – temperature sensor (PT 500)

TELEMETRY // LIVESIG: FAULT_DETECTED

Root Cause

ROOT CAUSE

1. Bad connection (corrosive/chipped contact). 2. Broken cable. 3. PT500 (NTC) is different. 4. Fault on the control module

CIRCUIT // SUBSYSTEMLOGIC: ROOT_ISOLATED

Repair Instructions

UNLOCKED

1PT500: Check connectors and cables. Replace the PT500 cavity. Replaces the PT500. Replace the control module

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 Technician Worldwide 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 PROTOCOLNTC Temperature Sensor & ThermistorOven / 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)

4.8kΩ–12kΩ (at 20°C–25°C)NOMINAL

0 Ω (SHORT)CALIBRATED BAND∞ OL (OPEN)

▲ NOMINAL OPERATING WINDOW

Target Component:NTC Temperature Sensor Probe (Thermistor)

Test Pins & Connections

PROBE (+)

PROBE (-)

Across sensor pins 1-2 (unplugged harness)

Tolerance & Diagnostic CriteriaNegative temperature coefficient: resistance drops smoothly when warmed with fingers. OL = open circuit.

1. Pre-Intervention Electrical Safety Protocols

!Electrical Safety Protocol: Disconnect 230V electrical mains power before removing appliance side or rear panels.
!Ensure tub water or heating chamber has cooled below 30°C before unclipping thermistor probe.
!Use CAT III 600V/1000V insulated test probes when tng at PCB edge connectors.

3. Preliminary Mechanical & Visual Checks

Inspect sensor immersion sleeve for calcification, limescale scale, or thermal paste degradation.
Check wiring harness for pinch points, chafing against chassis metal, and terminal pin oxidation.
Verify probe is firmly seated in its rubber grommet or bracket inside the water/air circuit.

Perform these diagnostic steps before triggering AI Deep Search or replacing boards.Certified Workshop Routine

Frequently Asked Questions: Bosch E104

FAQ TREE

What does error code E104 mean on a Bosch appliance?

Bosch error code E104 indicates: Short circuit oven – temperature sensor (PT 500).

What is the root cause of Bosch error code E104?

The primary root cause for Bosch code E104 is: 1. Bad connection (corrosive/chipped contact). 2. Broken cable. 3. PT500 (NTC) is different. 4. Fault on the control module.

How do I fix or resolve Bosch error code E104?

To resolve error code E104: PT500: Check connectors and cables. Replace the PT500 cavity. Replaces the PT500. Replace the control module

Is it safe to clear Bosch error code E104 by resetting power?

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Bosch code E104 persists, the physical component causing 1. Bad connection (corrosive/chipped contact). 2. Broken cable. 3. PT500 (NTC) is different. 4. Fault on the control module must be inspected or replaced.

How do I test electrical resistance for Bosch code E104 using a multimeter?

Set a digital multimeter to ohms (Ω). Disconnect power and test NTC Temperature Sensor Probe (Thermistor) across Across sensor pins 1-2 (unplugged harness). Expected nominal reading is 4.8kΩ–12kΩ (at 20°C–25°C). Tolerance: Negative temperature coefficient: resistance drops smoothly when warmed with fingers. OL = open circuit..

What safety protocol must be followed before servicing Bosch code E104?

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.

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OEM VERIFIED BENCH

OFFICIAL FAULT CODEE104

Bosch // OFFICIAL DIAGNOSTIC BENCH

Bosch E104

OvenNTC Temperature Sensor & Thermistor

Oven

Symptom / Description

FAULT

Short circuit oven – temperature sensor (PT 500)

TELEMETRY // LIVESIG: FAULT_DETECTED

Root Cause

ROOT CAUSE

1. Bad connection (corrosive/chipped contact). 2. Broken cable. 3. PT500 (NTC) is different. 4. Fault on the control module

CIRCUIT // SUBSYSTEMLOGIC: ROOT_ISOLATED

Repair Instructions

UNLOCKED

1PT500: Check connectors and cables. Replace the PT500 cavity. Replaces the PT500. Replace the control module

AI WORKSHOP PROTOCOL ENGINE

Direct extraction from OEM factory manuals & wiring schematics

Field Actions

DISPATCH

Need Help? Call a Certified Technician Worldwide 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 PROTOCOLNTC Temperature Sensor & ThermistorOven / Microwave

2. Multimeter & Electrical Bench Tests (Ω)

MODE: OHMMETER (Ω)AUTO-RANGE

CALIBRATED METROLOGY RESISTANCE BENCH (CAT III)

Nominal Resistance (Ω)

4.8kΩ–12kΩ (at 20°C–25°C)NOMINAL

0 Ω (SHORT)CALIBRATED BAND∞ OL (OPEN)

▲ NOMINAL OPERATING WINDOW

Target Component:NTC Temperature Sensor Probe (Thermistor)

Test Pins & Connections

PROBE (+)

PROBE (-)

Across sensor pins 1-2 (unplugged harness)

Tolerance & Diagnostic CriteriaNegative temperature coefficient: resistance drops smoothly when warmed with fingers. OL = open circuit.

1. Pre-Intervention Electrical Safety Protocols

!Electrical Safety Protocol: Disconnect 230V electrical mains power before removing appliance side or rear panels.
!Ensure tub water or heating chamber has cooled below 30°C before unclipping thermistor probe.
!Use CAT III 600V/1000V insulated test probes when tng at PCB edge connectors.

3. Preliminary Mechanical & Visual Checks

Inspect sensor immersion sleeve for calcification, limescale scale, or thermal paste degradation.
Check wiring harness for pinch points, chafing against chassis metal, and terminal pin oxidation.
Verify probe is firmly seated in its rubber grommet or bracket inside the water/air circuit.

Perform these diagnostic steps before triggering AI Deep Search or replacing boards.Certified Workshop Routine

Frequently Asked Questions: Bosch E104

FAQ TREE

What does error code E104 mean on a Bosch appliance?

Bosch error code E104 indicates: Short circuit oven – temperature sensor (PT 500).

What is the root cause of Bosch error code E104?

The primary root cause for Bosch code E104 is: 1. Bad connection (corrosive/chipped contact). 2. Broken cable. 3. PT500 (NTC) is different. 4. Fault on the control module.

How do I fix or resolve Bosch error code E104?

To resolve error code E104: PT500: Check connectors and cables. Replace the PT500 cavity. Replaces the PT500. Replace the control module

Is it safe to clear Bosch error code E104 by resetting power?

How do I test electrical resistance for Bosch code E104 using a multimeter?

What safety protocol must be followed before servicing Bosch code E104?

Community Verification

COMMUNITY

Did this solution resolve the issue?

Bosch E104

Symptom / Description

Root Cause

Repair Instructions

Field Actions

Workshop Verification & Safety Checklist

Frequently Asked Questions: Bosch E104

Community Verification

Related Bosch Oven / Microwave Error Codes

Bosch E104

Symptom / Description

Root Cause

Repair Instructions

Field Actions

Workshop Verification & Safety Checklist

Frequently Asked Questions: Bosch E104

Community Verification

Related Bosch Oven / Microwave Error Codes