- Appliances
- Dishwashers
E21
Bosch dishwasher E21: blocked heat pump
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
E21 means the heat-pump hydraulic path was detected as blocked. 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 E21 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 E21
- Bosch E21
- Bosch E21 error
- Bosch Geschirrspüler Fehler E21
- E21
- E21 Bosch dishwasher
- E21 lavavajillas Bosch
- E:21
- error E21 Bosch
- error E21 lavadora Teka
- error E21 lavavajillas Haier
- F21
- F:21
- Fehlercode E21 Bosch
- Haier dishwasher E21
- Haier dishwasher error E21
- Haier dishwasher solenoid valve open E21
- Haier dishwasher water keeps filling
- Haier lavavajillas E21
- lavadora Teka TKD E21 no desagua
- lavavajillas Bosch E21
- lavavajillas Haier electroválvula abierta E21
- lavavajillas Haier entra agua sin parar
- microondas Whirlpool E21 sensor térmico
- Teka E21 error washer
- Teka E21 lavadora
- Teka TKD washer E21 not draining
- Teka washing machine E21
- Whirlpool E21 over the range
- Whirlpool microondas E21
- Whirlpool microwave E21
- Whirlpool microwave E21 thermal sensor
- Whirlpool over the range E21
What it means
Bosch's official United States dishwasher table associates E21 with a blocked 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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