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Appliance Fix Guide

Bosch Dishwasher error code

Bosch Dishwasher Error E21

Blocked heat pump.

Blocked heat pump.

Updated Aug 18, 2026
Diagnose before buying a part
Bosch dishwasher repair guide for error E21
Error codeE21Dishwasher

Try these first

Start here before buying a part or taking the appliance apart.

  1. 1
    Check 1

    Reset Power: Disconnect the dishwasher from power for about ten seconds to clear any minor electrical faults.

  2. 2
    Check 2

    Check for Blockages: Inspect the heat pump for any debris or blockages that could be obstructing its function.

  3. 3
    Check 3

    Inspect the Impeller: Ensure the pump's impeller can spin freely.

A quick explanation

What does E21 mean?

Blocked heat pump.

The answer you came for

How to fix Bosch dishwasher error E21

Start with the safest checks and work from simple to technical.

  1. 1

    Step 1

    1. Cut all power to the dishwasher by switching off the corresponding circuit breaker.

  2. 2

    Step 2

    2. Turn off the hot water supply valve under the sink.

  3. 3

    Step 3

    3. Gently slide the dishwasher out from its installed position. It's best to place it on its back on a soft blanket or cardboard to access the underside.

  4. 4

    Step 4

    4. Identify the circulation pump, which is a large motor and housing assembly near the center.

  5. 5

    Step 5

    5. Disconnect the electrical wires leading to the pump and detach the inlet and outlet hoses. Have a shallow pan and towels ready for water that will drain out.

  6. 6

    Step 6

    6. Remove the screws or release the tabs that mount the pump to the dishwasher's sump assembly and remove the old pump.

  7. 7

    Step 7

    7. Mount the new circulation pump, reattach the hoses and wiring, and carefully return the dishwasher to its upright position before reinstalling and testing.

Read the additional checks from the current guide

How to Fix E21 Error (Step-by-Step) Cut all power to the dishwasher by switching off the corresponding circuit breaker. Turn off the hot water supply valve under the sink. Gently slide the dishwasher out from its installed position. It’s best to place it on its back on a soft blanket or cardboard to access the underside. Identify the circulation pump, which is a large motor and housing assembly near the center. Disconnect the electrical wires leading to the pump and detach the inlet and outlet hoses. Have a shallow pan and towels ready for water that will drain out. Remove the screws or release the tabs that mount the pump to the dishwasher’s sump assembly and remove the old pump. Mount the new circulation pump, reattach the hoses and wiring, and carefully return the dishwasher to its upright position before reinstalling and testing. Turn the appliance off, wait about 2 minutes, then turn it back on.

What to Check Next on This Bosch Dishwasher E21: E21 is a wash/circulation path on many Bosch dishwasher fault lists. Look for blocked movement before replacing the pump. Remove and clean the filter, then inspect the sump for glass, labels, or debris that could block the impeller area. Check that spray arms spin freely and are not clogged, then run a short cycle and listen for strong circulation. If circulation is weak after cleaning, inspect the circulation pump, capacitor where used, wiring, and control feed. If the symptom returns after these checks, use the full Bosch model number from the door tag before ordering any part. The same display message can point to different parts depending on the exact model and what the dishwasher does during fill, wash, drain, or dry. Recommended Parts to Check No exact official OEM part number is listed here because the correct Bosch dishwasher part can vary by complete model number. These are targeted part-category searches, not universal fit claims. Bosch dishwasher water inlet valve Common replacement category: Water inlet valve Fit note: Exact OEM part number varies by full Bosch dishwasher model number. Confirm compatibility before buying. Confidence: MediumThis category can be relevant for fill and water-supply faults after the tap, hose, and inlet screen are checked. Search Amazon for Bosch dishwasher water inlet valve Bosch dishwasher drain pump Common replacement category: Drain pump Fit note: Exact OEM part number varies by full Bosch dishwasher model number. Confirm compatibility before buying. Confidence: MediumThis category can be relevant for drain and standing-water symptoms after the filter, sump, and hose are checked. Search Amazon for Bosch dishwasher drain pump Bosch dishwasher circulation pump Common replacement category: Circulation pump / wash motor Fit note: Exact OEM part number varies by full Bosch dishwasher model number. Confirm compatibility before buying. Confidence: MediumThis category can be relevant for wash, spray-arm, and circulation symptoms after filters and spray arms are checked. Search Amazon for Bosch dishwasher circulation pump Before ordering: match the part to the complete Bosch dishwasher model number on the appliance tag. Still Not Working? If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure. Ask a Technician Online – Get Answer in Minutes Find a Local Repair Pro Near You

If the code comes back

Do not keep replacing parts based only on the code. Repeat the safe checks above. If the fault remains, stop and arrange qualified service rather than ordering from the code alone.

What may be causing it?

  • Blocked or faulty heat pump/circulation pump
  • Obstructed pump impeller

These are possibilities to investigate, not proof that one part has failed.

Recommended part

Recommended part for this error code

Replacement part

OEM candidate: 12008381

Price noted in the current guide: $100-$200

Why this part is shown: It is associated with Bosch Dishwasher error E21 in the current guide. The error code alone does not prove this part has failed.

Compatibility varies by model. Confirm that the Amazon listing includes your complete dishwasher model number before ordering.

Amazon part link View recommended part on Amazon

You can open the recommendation now. Check model compatibility on the Amazon page before purchasing.

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Replacement options

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If repairing this dishwasher no longer feels worthwhile, compare three replacement paths below.

Why shop your replacement on Amazon?

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  • Installation help

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Delivery and service options, fees, and availability vary by item, seller, and delivery ZIP code. Confirm available services at Amazon checkout.

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Make the money decision

Repair or replace calculator

Use the age and total repair estimate to get a simple comparison. This is guidance, not a guarantee.

Safety first

Disconnect power before opening panels or touching internal parts.

When to stop
  • Stop if you see burned wiring, melted connectors, water near electrical parts, or a gas smell.
  • Do not perform live-voltage testing unless you are trained and equipped for it.
  • Use the exact model manual or service information before replacing electronic controls.

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