Bosch Dishwasher Error E18

⚡ Quick Answer: The Bosch dishwasher E18 error indicates a drainage issue caused by insufficient water supply. Symptoms include the error code displayed on the panel,... ✅ DIY Fixable

What Does Error E18 Mean?

The Bosch dishwasher E18 error indicates a drainage issue caused by insufficient water supply. Symptoms include the error code displayed on the panel, the dishwasher stopping early, or low water entering the appliance at the start of a cycle. Common causes include clogged filters, a blocked AquaStop hose, or low household water pressure. Addressing these issues promptly can help restore normal operation.

Common Symptoms:

  • Error E18 displayed on dishwasher panel
  • Dishwasher stops early or does not fill with water
  • Low or no water entering dishwasher at start of cycle

Possible Causes

  • Insufficient water supply to the dishwasher (high)
  • Clogged filters in the water supply or AquaStop hose (high)
  • Low household water pressure or blocked tap (medium)

How to Fix Error E18

DIY Fix Check and restore water supply

  1. Turn off the dishwasher and water supply
  2. Ensure the water tap supplying the dishwasher is fully open
  3. Check that water flows at sufficient rate (~10 L/min) from the tap by using a bucket and timing flow
  4. Turn water supply back on and restart dishwasher

DIY Fix Inspect inlet hose and filters

  1. Turn off water and power to dishwasher
  2. Inspect inlet/supply hose for kinks, bends, or damage and straighten/replace if needed
  3. Remove and clean filters in the water connection or AquaStop hose using a small brush
  4. Reconnect hose securely and check for leaks

Technician Only Evaluate water pressure and plumbing to dishwasher

  1. Measure actual water pressure at dishwasher feed point
  2. Inspect household plumbing taps/valves for blockages or scale buildup
  3. If water pressure remains inadequate, adjust or repair plumbing supply system

Parts needed: pressure gauge, replacement supply valves or hoses if damaged

🛑 When to Call a Pro:
  • If cleaning filters and checking hoses doesn’t resolve the error
  • If visible damage to inlet components is found
  • If water pressure is adequate but dishwasher still displays E18

Next step

Choose the next step for E18

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Check during diagnosis

Most relevant component to inspect

Drain Pump

Pumps waste water out of the appliance during the drain cycle.

Typical part-only price
$35 - $80
DIY difficulty
Easy
Estimated time
15-30 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

Also check
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Other parts options

Check related components first; use model search as a fallback.

Possible related component

Drain Hose

Carries waste water from the drain pump to your home's standpipe or sink drain.

$15 - $30 · Easy · 15-30 mins

Check fit & price
Model number required

Model-compatible Dishwasher parts

Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.

Find a part that fits my model

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Optional routine care

Maintenance supplies

These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.

Maintenance supply

Dishwasher Cleaner and Descaler

Supports routine removal of mineral scale, grease, and odor. It is maintenance, not a repair for a failed pump, valve, or control.

View maintenance supply
Maintenance supply

Braided Dishwasher Inlet Hose

For replacement of an externally damaged supply hose. Verify connection size, length, and appliance installation requirements before ordering.

View maintenance supply

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.

Technical Specifications

wattage 50W
component Drain Pump
resistance 10-30 ohms
part_number Bosch 00420312
voltage_rating 120V AC

Common Questions

What does E18 error mean on bosch dishwasher?

E18 indicates a drainage issue due to insufficient water supply, causing the dishwasher to stop early or fill poorly.

Can I fix bosch dishwasher E18 error myself?

Yes, you can check and restore the water supply, inspect the inlet hose for damage, and clean filters.

How much does it cost to fix E18 error?

Repair costs range from $50 to $200, depending on necessary plumbing adjustments.

When should I call a technician for E18?

Call a technician if cleaning filters and hoses doesn't resolve the issue or if there's visible damage to components.

Sources & References

Data last verified: 2026-07-25

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