- Appliances
- Dishwashers
E03
Bosch dishwasher E03: main-control relay fault
Evidence linked to this decision
View source: Bosch US dishwasher error codesRisk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
High
Quick answer
E03 means the main control detected a relay fault. Disconnect it once and request service if the code returns; do not open electrical covers.
Safety first
Stop and check this first
- Leave the dishwasher disconnected for heat, arcing, burning odour, repeated breaker trips or a damaged plug. Never probe an energised board.
Safe checks you can perform
- Perform one controlled power reset
- Inspect only the external supply
- Record the full code and E-number
Leave these tasks to a qualified professional
- Do not attempt this professional task: Separate supply and control faults
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Separate supply and control faults
What they doA qualified technician should test the incoming supply, protected input, harnesses and the code-specific control circuit.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Perform one controlled power reset
Switch off, isolate the dishwasher at its normal dry supply for 30 seconds and restore power only once.
Leave the dishwasher disconnected for heat, arcing, burning odour, repeated breaker trips or a damaged plug. Never probe an energised board.
Evidence: Bosch US dishwasher error codes
Inspect only the external supply
Remove extension leads and look for heat, damage or a tripped protection without opening the plug, outlet or appliance.
Leave the dishwasher disconnected for heat, arcing, burning odour, repeated breaker trips or a damaged plug. Never probe an energised board.
Evidence: Bosch US dishwasher error codes
Record the full code and E-number
Photograph the display and rating-plate E-number so service can select the correct circuit information.
Leave the dishwasher disconnected for heat, arcing, burning odour, repeated breaker trips or a damaged plug. Never probe an energised board.
Evidence: Bosch US dishwasher error codes
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Virtual technician
Does E03 still appear after these checks?
This guided flow uses the exact code and your answers to choose a test, an expected result and the next branch.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Appliances
- Brand
- Bosch
- Product type
- Dishwashers
Known code variants
- Bosch dishwasher E03
- Bosch dryer E03
- Bosch dryer E03 condensation drain hose
- Bosch E03
- Bosch E03 error
- Bosch E03 error tumble dryer
- Bosch E03 secadora
- código E03 lavavajillas Bosch
- E 03
- E03 Bosch dishwasher
- E3
- E:03
- Error 03
- error E03 lavavajillas Bosch
- error E03 secadora Bosch
- lavavajillas Bosch E03
- Philips brew group error
- Philips cafetera E03
- Philips E03
- Philips error 03
- secadora Bosch E03 desagüe condensación
What it means
Bosch's official United States dishwasher table associates E03 with a main-control-board relay fault. This page is restricted to Bosch dishwashers: the same code on a washer, dryer or another appliance can mean something else, and the exact E-number and manual decide compatibility.
Warnings and stop conditions
- Mediumsource verified
Leave the dishwasher disconnected for heat, arcing, burning odour, repeated breaker trips or a damaged plug. Never probe an energised board.
Evidence: Bosch US dishwasher error codes
Symptoms and causes
Probable causes · in order
- External supply or a transient interrupted controlConfirmed
A brief outage, unstable outlet or interrupted startup can leave the electronic self-test incomplete.
Evidence: Bosch US dishwasher error codes
- A board, relay, harness or protected input is faultyPossible
Internal power distribution and control feedback can produce the same display and require model-specific measurements.
Evidence: Bosch US dishwasher error codes
Sources and technical references
- 1
Bosch US dishwasher error codes
BSH Hausgeräte GmbH · 2026 · official_doc
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