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Appliance Fix Guide

Bosch Refrigerator error code

Bosch Refrigerator Error E21

Communication error between the display control module and the ice and water dispenser control module.

Communication error between the display control module and the ice and water dispenser control module.

Updated Aug 18, 2026
informationalno_parts
Bosch refrigerator repair guide for error E21
Error codeE21Refrigerator

Try these first

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

  1. 1
    Check 1

    Disconnect the refrigerator from power for several minutes, then reconnect.

  2. 2
    Check 2

    Check the wire harness connections between the display control module and the ice/water dispenser control module for any loose or damaged wires.

  3. 3
    Check 3

    Look for any visible signs of damage, such as burn marks, on both control modules.

A quick explanation

What does E21 mean?

Communication error between the display control module and the ice and water dispenser control module.

The answer you came for

How to fix Bosch refrigerator error E21

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

  1. 1

    Step 1

    1. Unplug the refrigerator from the wall outlet to ensure your safety.

  2. 2

    Step 2

    2. Attempt a system reset by leaving the refrigerator unplugged for 10-15 minutes to allow the internal electronics to discharge, then plug it back in. If the error persists, proceed to the next step.

  3. 3

    Step 3

    3. Access the display control module, which is typically located behind the main user interface on the exterior of the refrigerator door. This may require carefully prying off a plastic cover or removing a few screws.

  4. 4

    Step 4

    4. Locate the ice and water dispenser control module, usually found inside the dispenser housing itself. You will likely need to remove the dispenser drip tray and front panel to access it.

  5. 5

    Step 5

    5. Carefully inspect the wiring harness that connects the display module to the dispenser module. Look for any pinched, frayed, or disconnected wires. Securely reconnect any loose plugs you find.

  6. 6

    Step 6

    6. If the wiring appears intact, one of the control modules has likely failed. It is recommended to replace the dispenser control module first. Disconnect the wire connectors from the old module, remove it from its mounting, and install the new one in its place.

  7. 7

    Step 7

    7. If the error code still appears after replacing the dispenser module, you will need to replace the main display control module by following a similar process of disconnecting its wiring and swapping the old board for the new one.

Read the additional checks from the current guide

How to Fix E21 Error (Step-by-Step) Unplug the refrigerator from the wall outlet to ensure your safety.Attempt a system reset by leaving the refrigerator unplugged for 10-15 minutes to allow the internal electronics to discharge, then plug it back in. If the error persists, proceed to the next step.Access the display control module, which is typically located behind the main user interface on the exterior of the refrigerator door. This may require carefully prying off a plastic cover or removing a few screws.Locate the ice and water dispenser control module, usually found inside the dispenser housing itself. You will likely need to remove the dispenser drip tray and front panel to access it.Carefully inspect the wiring harness that connects the display module to the dispenser module. Look for any pinched, frayed, or disconnected wires. Securely reconnect any loose plugs you find.If the wiring appears intact, one of the control modules has likely failed. It is recommended to replace the dispenser control module first. Disconnect the wire connectors from the old module, remove it from its mounting, and install the new one in its place.Turn the appliance off, wait about 2 minutes, then turn it back on. Parts Availability Note: For this Electrolux/Frigidaire error code, exact OEM part numbers can vary by model revision and serial range. We’ve listed the most likely component(s), but confirm compatibility using your full model number before ordering. If no exact SKU is shown, use this guide for diagnosis first, then verify the matching OEM part on RepairClinic or PartSelect. Recommended Parts to Check No exact official OEM part number is listed here because the correct Bosch refrigerator part can vary by complete model number. These are targeted part-category searches, not universal fit claims. Bosch refrigerator temperature sensor Common replacement category: Temperature sensor / thermistor Fit note: Exact OEM part number varies by full Bosch refrigerator model number. Confirm compatibility before buying. Confidence: MediumThis category can be relevant for temperature, alarm, and cooling-sensor faults after the door seal, vents, and settings are checked. Search Amazon for Bosch refrigerator temperature sensor Bosch refrigerator evaporator fan motor Common replacement category: Evaporator fan motor Fit note: Exact OEM part number varies by full Bosch refrigerator model number. Confirm compatibility before buying. Confidence: MediumThis category can be relevant for airflow, fan, and uneven-cooling symptoms after ice buildup and obstructions are ruled out. Search Amazon for Bosch refrigerator evaporator fan motor Bosch refrigerator electronic control board Common replacement category: Main electronic control board Fit note: Exact OEM part number varies by full Bosch refrigerator model number. Confirm compatibility before buying. Confidence: MediumThis category can be relevant for repeated electronic, display, or cooling-control faults after connectors and power are checked. Search Amazon for Bosch refrigerator electronic control board Before ordering: match the part to the complete Bosch refrigerator 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.

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?

  • Communication error between the display control module and the ice/water dispenser control module
  • Faulty display control module
  • Faulty ice and water dispenser control module
  • Damaged or loose wire harness

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

Recommended part

Recommended part for this error code

Display Control Module

Price noted in the current guide: $250-$400

Why this part is shown: It is associated with Bosch Refrigerator 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 refrigerator 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

Ready to replace your refrigerator?

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

Why shop your replacement on Amazon?

  • Fast, free delivery

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  • Convenient delivery options

    Select large appliances may offer scheduled or Room of Choice delivery.

  • Haul-away options

    Haul-away may be available for select appliances and delivery areas.

  • Installation help

    Installation or assembly may be available on select items.

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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