Bosch Dishwasher: water supply error, program interruption, error code E30-00, poor cleaning performance

Professional Repair Guide

What is this symptom?

Experiencing a Bosch dishwasher water supply error with code E30-00? This issue often results in program interruptions and poor cleaning performance. Your dishwasher may stop mid-cycle, indicate a leak safety problem, or refuse to start. Understanding the common causes can help you troubleshoot effectively.

Urgency: High

Important Tips for Bosch Models

  • Bosch documentation does not explicitly list E30‑00 in consumer manuals, but community consensus associates it with flood safety activation and water in base issues.

Possible Causes

Leak detection / water in base triggering flood safety

How to Identify: Error appears mid‑or post‑wash; water detected under unit; E30‑00 shown; machine halts; sometimes water present if tray removed.

Part: Anti‑flood sensor / base pan / AquaStop system

Drainage blockage leading to water backing up into base sensor

How to Identify: Water not draining, standing water, poor cleaning, gurgling sounds, visible debris in filter, E30 or related codes during drainage phase.

Part: Drain hose / drain pump / filter

Water inlet issue / low supply pressure or kinked hose causing incomplete cycles

How to Identify: Dishwasher struggles to fill, long fill times, poor cleaning results, low pressure symptoms, E16/E18 codes sometimes accompany supply issues.

Part: Water inlet hose / valve / pressure

Electronic glitch requiring reset

How to Identify: Error appears sporadically without visible water issues; resets clear code temporarily.

Part: Control electronics / software

DIY Solutions

Dry out base tray and reset dishwasher

Moderate 30–60 minutes
Tools Needed: Towels, sponge, flashlight, bucket
  1. Turn off dishwasher power at breaker and shut off water supply.
  2. Remove lower kickplate and tilt unit slightly forward to drain any trapped water into a pan or towel.
  3. Soak up residual water from base tray and allow to air dry if possible.
  4. Check for obvious leaks in hoses or seals.
  5. Restore power and water, then run a short cycle to see if error persists.
⚠️ Safety First: Ensure power and water are disconnected before tilting or working beneath unit.

Clean drain filter and inspect drain hose

Moderate 15–30 minutes
Tools Needed: Screwdriver (if needed), Bucket, Gloves
  1. Turn off dishwasher and open bottom rack to access filter assembly.
  2. Remove and wash out filter screen and inspect for debris.
  3. Check drain hose at back of dishwasher for kinks/blockages; straighten or clear if needed.
  4. Reassemble filter, restore power, and run a rinse.
⚠️ Safety First: Ensure spilled water doesn’t contact electrical components.

Check water supply hose and valve

Easy 10–20 minutes
Tools Needed: Wrench (optional)
  1. Turn off water supply and inspect inlet hose for kinks or bends.
  2. Ensure water supply valve is fully open and supplying adequate pressure.
  3. Reconnect hose securely and restore water, then test machine.
⚠️ Safety First: Do not overtighten fittings, avoid leaks.

Power cycle the dishwasher

Easy 5–10 minutes
  1. Turn off the dishwasher using the control panel or breaker.
  2. Wait 1–2 minutes.
  3. Restore power and try a short wash cycle to clear transient errors.

Next step

Choose the next step for water supply error, program interruption, error code E30-00, poor cleaning performance

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

Float Switch

Detects the maximum water level to prevent overflow and potential flooding.

Typical part-only price
$15 - $40
DIY difficulty
Easy
Estimated time
10-20 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.

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
Possible related component

Drain Pump

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

$35 - $80 · Easy · 15-30 mins

Check fit & price
Possible related component

Water Supply Hose

Connects your home water valves to the water inlet valve on the appliance.

$15 - $35 · Easy · 10-15 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

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.

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.

Professional Repairs

Replace flood sensor / anti‑flood assembly

Estimated Cost: $150 - $300

Drain pump or control board inspection/replacement

Estimated Cost: $200 - $500

When to Call a Professional

Error persists after draining out water and clearing filters/hose
Visible leak from internal hoses or components
Dishwasher repeatedly shuts off mid‑cycle with E30‑00
Drain pump hums without clearing water

Preventive Maintenance

  • Clean filters and drain parts: Drainage blockage and water backup that can trigger safety errors
    Frequency: monthly
  • Inspect hoses for kinks or wear: Low water supply issues and leaks
    Frequency: quarterly

Frequently Asked Questions

Why is my Bosch Dishwasher Water supply error; program interruption; error code E30-00; poor cleaning performance?
Common causes include leak detection, drainage blockage, low water supply, or electronic glitches.
How do I fix Bosch Dishwasher Water supply error; program interruption; error code E30-00; poor cleaning performance myself?
Try drying the base, cleaning the drain filter, checking the water supply hose, or power cycling the dishwasher.
How much does it cost to fix Water supply error; program interruption; error code E30-00; poor cleaning performance?
Professional repairs can cost between $150 and $500 depending on the issue.
When should I call a technician for Water supply error; program interruption; error code E30-00; poor cleaning performance?
Call a technician if DIY fixes fail or if you encounter complex issues.

References & Sources

Community Analytical Insights

Guidance from available sources; statistical claims are shown only for samples of at least 10 discussions

Common Issues Reported by Users

  • Clogged or kinked water supply hose
  • Faulty water inlet valve
  • Blocked filter or spray arms

User Suggested Solutions

  1. Inspect the water supply hose for kinks or clogs. Disconnect the hose and check for blockages. Reconnect securely.

  2. Test the water inlet valve for continuity using a multimeter. Replace if faulty.

  3. Remove and clean the filter and spray arms to ensure proper water flow. Reassemble and test the dishwasher.

Limited-source guidance; percentages and success-rate claims are not shown
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. Bosch dishwasher - Water tap error

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