OEM VERIFIED BENCH

OFFICIAL FAULT CODEE03

Bosch // OFFICIAL DIAGNOSTIC BENCH

Bosch E03

DishwasherDrainage System & Drain Pump

Dishwasher

Select Appliance Type

0ms Instant Telemetry Switch

Other Brands Sharing Code E03:SiemensE03 ElectroluxE03 AEGE03 CandyE03 NeffE03 HooverE03 ZanussiE03 Arthur MartinE03 GaggenauE03 SchulthessE03

Symptom / Description

FAULT

Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Auxiliary heating relay circuit discrepancy E03; microprocessor detects inconsistent contact state across heating relays.

TELEMETRY // LIVESIG: FAULT_DETECTED

Root Cause

ROOT CAUSE

On Bosch dishwashers: Welded relay contacts, leakage current to ground on heating element (> 10 mA), or faulty voltage sensing resistors on PCB.

CIRCUIT // SUBSYSTEMLOGIC: ROOT_ISOLATED

Repair Instructions

UNLOCKED

1Measure heating element insulation resistance to ground (must be > 20 MΩ with 500V megohmmeter). Inspect PCB for burnt traces or replace power board. Hold Start/Reset key for 3 seconds until '0:01' appears, close door, allow 60s for drain completion, then power 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 PROTOCOLDrainage System & Drain PumpDishwasher

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)

160Ω–220Ω (Sync 230V) / 20Ω–45Ω (3-Phase BLDC)NOMINAL

0 Ω (SHORT)CALIBRATED BAND∞ OL (OPEN)

▲ NOMINAL OPERATING WINDOW

Target Component:Drain Pump Motor Stator Coils

Test Pins & Connections

PROBE (+)

PROBE (-)

Across pump motor spade terminals (L-N unclipped)

Tolerance & Diagnostic Criteria±10% balance. Insulation resistance between coil and motor chassis must exceed 20MΩ.

1. Pre-Intervention Electrical Safety Protocols

!Electrical Safety Protocol: Isolate 230V mains power before accessing the lower pump housing.
!Prepare a shallow basin and absorption towels: expect 3 to 10 liters of stagnant trapped water upon filter opening.
!Beware of sharp foreign objects (broken glass, needles, screws) trapped inside the impeller cavity.

3. Preliminary Mechanical & Visual Checks

Unscrew coin trap filter and clear all foreign debris (coins, hairpins, bra underwires).
Rotate pump impeller manually: synchronous magnetic rotors should snap cleanly in 90° intervals without jamming.
Check drain hose for kinks, blockages, or unpunched sink spigots; verify drain height is between 65cm and 100cm.

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

Frequently Asked Questions: Bosch E03

FAQ TREE

What does error code E03 mean on a Bosch appliance?

Bosch error code E03 indicates: Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Auxiliary heating relay circuit discrepancy E03; microprocessor detects inconsistent contact state across heating relays..

What is the root cause of Bosch error code E03?

The primary root cause for Bosch code E03 is: On Bosch dishwashers: Welded relay contacts, leakage current to ground on heating element (> 10 mA), or faulty voltage sensing resistors on PCB..

How do I fix or resolve Bosch error code E03?

To resolve error code E03: Measure heating element insulation resistance to ground (must be > 20 MΩ with 500V megohmmeter). Inspect PCB for burnt traces or replace power board. Hold Start/Reset key for 3 seconds until '0:01' appears, close door, allow 60s for drain completion, then power off.

Is it safe to clear Bosch error code E03 by resetting power?

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Bosch code E03 persists, the physical component causing On Bosch dishwashers: Welded relay contacts, leakage current to ground on heating element (> 10 mA), or faulty voltage sensing resistors on PCB. must be inspected or replaced.

How do I test electrical resistance for Bosch code E03 using a multimeter?

Set a digital multimeter to ohms (Ω). Disconnect power and test Drain Pump Motor Stator Coils across Across pump motor spade terminals (L-N unclipped). Expected nominal reading is 160Ω–220Ω (Sync 230V) / 20Ω–45Ω (3-Phase BLDC). Tolerance: ±10% balance. Insulation resistance between coil and motor chassis must exceed 20MΩ..

What safety protocol must be followed before servicing Bosch code E03?

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 CODEE03

Bosch // OFFICIAL DIAGNOSTIC BENCH

Bosch E03

DishwasherDrainage System & Drain Pump

Dishwasher

Select Appliance Type

0ms Instant Telemetry Switch

Other Brands Sharing Code E03:SiemensE03 ElectroluxE03 AEGE03 CandyE03 NeffE03 HooverE03 ZanussiE03 Arthur MartinE03 GaggenauE03 SchulthessE03

Symptom / Description

FAULT

Bosch Serie 4 / Serie 6 / Serie 8 ActiveWater & PerfectDry Zeolith: Auxiliary heating relay circuit discrepancy E03; microprocessor detects inconsistent contact state across heating relays.

TELEMETRY // LIVESIG: FAULT_DETECTED

Root Cause

ROOT CAUSE

On Bosch dishwashers: Welded relay contacts, leakage current to ground on heating element (> 10 mA), or faulty voltage sensing resistors on PCB.

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 PROTOCOLDrainage System & Drain PumpDishwasher

2. Multimeter & Electrical Bench Tests (Ω)

MODE: OHMMETER (Ω)AUTO-RANGE

CALIBRATED METROLOGY RESISTANCE BENCH (CAT III)

Nominal Resistance (Ω)

160Ω–220Ω (Sync 230V) / 20Ω–45Ω (3-Phase BLDC)NOMINAL

0 Ω (SHORT)CALIBRATED BAND∞ OL (OPEN)

▲ NOMINAL OPERATING WINDOW

Target Component:Drain Pump Motor Stator Coils

Test Pins & Connections

PROBE (+)

PROBE (-)

Across pump motor spade terminals (L-N unclipped)

Tolerance & Diagnostic Criteria±10% balance. Insulation resistance between coil and motor chassis must exceed 20MΩ.

1. Pre-Intervention Electrical Safety Protocols

!Electrical Safety Protocol: Isolate 230V mains power before accessing the lower pump housing.
!Prepare a shallow basin and absorption towels: expect 3 to 10 liters of stagnant trapped water upon filter opening.
!Beware of sharp foreign objects (broken glass, needles, screws) trapped inside the impeller cavity.

3. Preliminary Mechanical & Visual Checks

Unscrew coin trap filter and clear all foreign debris (coins, hairpins, bra underwires).
Rotate pump impeller manually: synchronous magnetic rotors should snap cleanly in 90° intervals without jamming.
Check drain hose for kinks, blockages, or unpunched sink spigots; verify drain height is between 65cm and 100cm.

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

Frequently Asked Questions: Bosch E03

FAQ TREE

What does error code E03 mean on a Bosch appliance?

What is the root cause of Bosch error code E03?

The primary root cause for Bosch code E03 is: On Bosch dishwashers: Welded relay contacts, leakage current to ground on heating element (> 10 mA), or faulty voltage sensing resistors on PCB..

How do I fix or resolve Bosch error code E03?

Is it safe to clear Bosch error code E03 by resetting power?

How do I test electrical resistance for Bosch code E03 using a multimeter?

What safety protocol must be followed before servicing Bosch code E03?

Community Verification

COMMUNITY

Did this solution resolve the issue?

Bosch E03

Symptom / Description

Root Cause

Repair Instructions

Field Actions

Workshop Verification & Safety Checklist

Frequently Asked Questions: Bosch E03

Community Verification

Related Bosch Dishwasher Error Codes

Bosch E03

Symptom / Description

Root Cause

Repair Instructions

Field Actions

Workshop Verification & Safety Checklist

Frequently Asked Questions: Bosch E03

Community Verification

Related Bosch Dishwasher Error Codes