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Bosch Dishwasher error code

Bosch Dishwasher Error E30

Bosch dishwasher code E30 indicates voltage is too high. Audited diagnosis findings: power surge; damaged or loose wiring; incorrect voltage from the outlet.

Bosch dishwasher code E30 indicates voltage is too high. Audited diagnosis findings: power surge; damaged or loose wiring; incorrect voltage from the outlet.

Updated Aug 18, 2026
Diagnose before buying a part
Bosch dishwasher repair guide for error E30
Error codeE30Dishwasher

Try these first

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

  1. 1
    Check 1

    Check for Power Surges: Try resetting the dishwasher by turning it off for 10-20 minutes.

  2. 2
    Check 2

    Inspect Wiring: Unplug the dishwasher and check for any damaged or loose wiring connections.

  3. 3
    Check 3

    Verify Voltage: Ensure the dishwasher is connected to a dedicated outlet and not an extension cord. Use a multimeter to check if the outlet's voltage is within the recommended range for the appliance.

A quick explanation

What does E30 mean?

Bosch dishwasher code E30 indicates voltage is too high. Audited diagnosis findings: power surge; damaged or loose wiring; incorrect voltage from the outlet.

The answer you came for

How to fix Bosch dishwasher error E30

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

  1. 1

    Step 1

    1. Turn off the circuit breaker for the dishwasher to completely cut off the power.

  2. 2

    Step 2

    2. Slide the dishwasher out from its installation spot to get to the control board, usually located in the door panel or at the base.

  3. 3

    Step 3

    3. Take a clear picture of the wire connections before you start, for easy reference.

  4. 4

    Step 4

    4. Carefully unplug all the wires connected to the control board.

  5. 5

    Step 5

    5. Remove the screws that are holding the control board in place and take out the old board.

  6. 6

    Step 6

    6. Put the new control board in the same spot and secure it with the screws.

  7. 7

    Step 7

    7. Reconnect all the wires by looking at the picture you took, put the dishwasher back, and turn the power on.

Read the additional checks from the current guide

How to Fix E30 Error (Step-by-Step) Turn off the circuit breaker for the dishwasher to completely cut off the power. Slide the dishwasher out from its installation spot to get to the control board, usually located in the door panel or at the base. Take a clear picture of the wire connections before you start, for easy reference. Carefully unplug all the wires connected to the control board. Remove the screws that are holding the control board in place and take out the old board. Put the new control board in the same spot and secure it with the screws. Reconnect all the wires by looking at the picture you took, put the dishwasher back, and turn the power on. Turn the appliance off, wait about 2 minutes, then turn it back on. Next Steps and Parts Verified Compatible Alternatives: 00438026 00622058 10028963 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.

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?

  • Power surge
  • Damaged or loose wiring
  • Incorrect voltage from the outlet
  • Faulty water inlet valve

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

Recommended part

Recommended part for this error code

Replacement part

OEM candidate: 00622058

Price noted in the current guide: $22-$83

Why this part is shown: It is associated with Bosch Dishwasher error E30 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

Ready to replace your dishwasher?

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

Why shop your replacement on Amazon?

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    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.

Free quick sheet

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Reviewed by the Appliance Fix Guide Editorial Team

Last reviewed and updated Jun 19, 2026 · Educational repair guidance, not a professional diagnosis

  • Researched against manufacturer documentation and service literature where available.
  • Safety-first structure: every guide starts with the safest first action and states when to stop and call a professional.
  • Part compatibility is treated cautiously: fitment must be confirmed against the exact model number before purchase.