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

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: 2026-01-16

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