- Appliances
- Dishwashers
E20
Bosch dishwasher E20: heat-pump heater 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
E20 means the internal heat-pump heater did not operate correctly. Let the appliance cool, isolate power and follow the model manual; most heating faults require service.
Safety first
Stop and check this first
- Stop for overheating, steam leakage, electrical smell, breaker trips or repeated heating codes. Never expose or energise a heater outside its housing.
Safe checks you can perform
- Allow a complete cool-down
- Use only the code-specific safe action
- Record heating and drying symptoms
Leave these tasks to a qualified professional
- Do not attempt this professional task: Diagnose the thermal and circulation system
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.
Diagnose the thermal and circulation system
What they doA technician should test circulation, enclosed heater, sensors, fan, mineral chamber and control against E-number data.
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.
Allow a complete cool-down
Stop the programme, keep the door closed until steam and hot water settle, then isolate power at a dry supply.
Stop for overheating, steam leakage, electrical smell, breaker trips or repeated heating codes. Never expose or energise a heater outside its housing.
Evidence: Bosch US dishwasher error codes
Use only the code-specific safe action
For E12 follow the model's approved descaling instructions; for airflow codes move dishes away from the visible vent after cooling.
Stop for overheating, steam leakage, electrical smell, breaker trips or repeated heating codes. Never expose or energise a heater outside its housing.
Evidence: Bosch US dishwasher error codes
Record heating and drying symptoms
Note whether water remained cold, drying stopped or unusual noise occurred, without opening the base or side panels.
Stop for overheating, steam leakage, electrical smell, breaker trips or repeated heating codes. Never expose or energise a heater outside its housing.
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 E20 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
- 20
- AEG E20 error
- AEG Fehler E20
- AEG lavadora C2
- AEG lavadora E20
- AEG lavadora E21
- AEG lavatrice C2
- AEG lavatrice E20
- AEG lavatrice E21
- AEG lave-linge C2
- AEG lave-linge E20
- AEG lave-linge E21
- AEG Waschmaschine C2
- AEG Waschmaschine E20
- AEG Waschmaschine E21
- AEG washer C2
- AEG washer E20
- AEG washer E21
- aerotermia Viessmann E20
- Baxi 20
- Baxi E 20
- Bosch dishwasher E20
- Bosch E20
- Bosch E20 error
- C2
- code erreur AEG E20
- E20
- E20 AEG lavadora
- E20 AEG lavatrice
- E20 AEG lave-linge
- E20 AEG Waschmaschine
- E20 AEG washer
- E20 Bosch dishwasher
- E20 lavavajillas Bosch
- E21
- E22
- E23
- E24
- E:20
- Electrolux dryer E20
- Electrolux dryer E20 drain
- Electrolux E20 error tumble dryer
- Electrolux E20 lavadora
- Electrolux E20 secadora
- Electrolux washer 2 beeps
- Electrolux washer error E20
- Electrolux washer not draining
- Electrolux washing machine E20
- Error 20 Baxi
- error AEG E20
- error E20 Bosch
- error E20 lavadora Electrolux
- error E20 lavadora Zanussi
- error E20 secadora Electrolux
- error E20 secadora Zanussi
- errore AEG E20
- lavadora Electrolux 2 pitidos
- lavadora Electrolux no desagua
- lavadora Zanussi E20 no desagua
- lavavajillas Bosch E20
- Neodens Plus 20
- secadora Electrolux E20 desagüe
- secadora Zanussi 2 pitidos
- Viessmann E20
- Viessmann Vitocal 100-AW E20
- Vitocal 100-AW AM2V E20
- Vitocal E20
- Vitocal exhaust temperature overprotection
- Vitocal temperatura descarga E20
- Zanussi dryer 2 beeps
- Zanussi dryer C2
- Zanussi dryer E20
- Zanussi E20 error washer
- Zanussi E20 lavadora
- Zanussi secadora C2
- Zanussi secadora E20
- Zanussi tumble dryer error E20
- Zanussi washer E20 not draining
- Zanussi washing machine E20
What it means
Bosch's official United States dishwasher table associates E20 with an internal heater fault in the heat pump. 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
Stop for overheating, steam leakage, electrical smell, breaker trips or repeated heating codes. Never expose or energise a heater outside its housing.
Evidence: Bosch US dishwasher error codes
Symptoms and causes
Probable causes · in order
- Heat, circulation or drying airflow is restrictedConfirmed
Scale, a blocked hydraulic path, obstructed air opening or abnormal circulation can prevent the expected temperature or drying response.
Evidence: Bosch US dishwasher error codes
- A heater, pump, fan, sensor or control circuit is faultyPossible
Several installed components share the thermal process, so the display does not identify one replaceable part.
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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