OEM VERIFIED BENCH

OFFICIAL FAULT CODEE73

Bosch // OFFICIAL DIAGNOSTIC BENCH

Bosch E73

DryerNTC Temperature Sensor & Thermistor

Dryer

Other Brands Sharing Code E73:SiemensE73 ElectroluxE73 AEGE73 NeffE73 ZanussiE73 Arthur MartinE73 GaggenauE73 CastorE73 FaureE73 FrigidaireE73

Symptom / Description

FAULT

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.

TELEMETRY // LIVESIG: FAULT_DETECTED

Root Cause

ROOT CAUSE

On Bosch tumble dryers: Dislodged sensor clip on condenser copper bend, open lead wire in lower harness, or sensor drift due to thermal cycling.

CIRCUIT // SUBSYSTEMLOGIC: ROOT_ISOLATED

Repair Instructions

UNLOCKED

1Measure condenser NTC sensor resistance (nominal ~10 kΩ at 25°C, ~3.6 kΩ at 50°C). Check clip attachment to copper tube. Replace NTC if out of spec. Turn cycle selector to 6 o'clock, press and hold Start/Pause, rotate selector to 7 o'clock, release button, return to Off.

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 & ThermistorTumble Dryer

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 E73

FAQ TREE

What does error code E73 mean on a Bosch appliance?

Bosch error code E73 indicates: 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..

What is the root cause of Bosch error code E73?

The primary root cause for Bosch code E73 is: On Bosch tumble dryers: Dislodged sensor clip on condenser copper bend, open lead wire in lower harness, or sensor drift due to thermal cycling..

How do I fix or resolve Bosch error code E73?

To resolve error code E73: Measure condenser NTC sensor resistance (nominal ~10 kΩ at 25°C, ~3.6 kΩ at 50°C). Check clip attachment to copper tube. Replace NTC if out of spec. Turn cycle selector to 6 o'clock, press and hold Start/Pause, rotate selector to 7 o'clock, release button, return to Off.

Is it safe to clear Bosch error code E73 by resetting power?

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Bosch code E73 persists, the physical component causing On Bosch tumble dryers: Dislodged sensor clip on condenser copper bend, open lead wire in lower harness, or sensor drift due to thermal cycling. must be inspected or replaced.

How do I test electrical resistance for Bosch code E73 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 E73?

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 CODEE73

Bosch // OFFICIAL DIAGNOSTIC BENCH

Bosch E73

DryerNTC Temperature Sensor & Thermistor

Dryer

Other Brands Sharing Code E73:SiemensE73 ElectroluxE73 AEGE73 NeffE73 ZanussiE73 Arthur MartinE73 GaggenauE73 CastorE73 FaureE73 FrigidaireE73

Symptom / Description

FAULT

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.

TELEMETRY // LIVESIG: FAULT_DETECTED

Root Cause

ROOT CAUSE

On Bosch tumble dryers: Dislodged sensor clip on condenser copper bend, open lead wire in lower harness, or sensor drift due to thermal cycling.

CIRCUIT // SUBSYSTEMLOGIC: ROOT_ISOLATED

Repair Instructions

UNLOCKED

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 & ThermistorTumble Dryer

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 E73

FAQ TREE

What does error code E73 mean on a Bosch appliance?

What is the root cause of Bosch error code E73?

The primary root cause for Bosch code E73 is: On Bosch tumble dryers: Dislodged sensor clip on condenser copper bend, open lead wire in lower harness, or sensor drift due to thermal cycling..

How do I fix or resolve Bosch error code E73?

Is it safe to clear Bosch error code E73 by resetting power?

How do I test electrical resistance for Bosch code E73 using a multimeter?

What safety protocol must be followed before servicing Bosch code E73?

Community Verification

COMMUNITY

Did this solution resolve the issue?

Bosch E73

Symptom / Description

Root Cause

Repair Instructions

Field Actions

Workshop Verification & Safety Checklist

Frequently Asked Questions: Bosch E73

Community Verification

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Bosch E73

Symptom / Description

Root Cause

Repair Instructions

Field Actions

Workshop Verification & Safety Checklist

Frequently Asked Questions: Bosch E73

Community Verification

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