Bosch · Dishwasher

E4

Water Intake Timeout

Severity

High

If your Bosch Dishwasher is displaying the error code E4, the control board has detected a fault identified as "Water Intake Timeout". Understanding the root cause helps you avoid an unnecessary service call.

Owner's Summary

The dishwasher started its cycle but water never arrived. Check under your sink — the water valve may be partially closed or the Aquastop safety hose may have triggered due to a previous small leak.

Symptoms

Bosch dishwasher not filling with water, stops after a few minutes, E4 displayed

Common Causes

Water supply valve under sink closed
Aquastop safety hose triggered
Kinked or blocked water inlet hose
Faulty water inlet valve

How to Fix

1 Open water supply valve fully under the sink
2 Inspect Aquastop hose indicator window — replace if red
3 Straighten and inspect inlet hose
4 Replace water inlet valve if valve does not open when energized

Tools You'll Need

Pliers Towels / Bucket Flashlight

Most of these fixes need only basic hand tools. If your repair requires opening electrical housings or testing live components, a multimeter and basic electrical safety knowledge are essential — when in doubt, call a technician.

Technical Explanation

The Bosch EGO module monitors fill rate via a Hall-effect flow meter or pressure switch. A target water volume not achieved within the fill window results in E4 with simultaneous de-energizing of the inlet valve solenoid.

Is It Safe to Keep Using?

No immediate risk. Resolve within a day.

Technician's Pro Tip

Bosch Aquastop hoses are a safety device — if the indicator window is red, there was a real water leak somewhere. Before replacing the Aquastop hose, trace where the leak originated to prevent the new hose from triggering again.

Related Codes

E1 — Bosch Washing Machine

Water Intake Fault

High

E18 — Bosch Washing Machine

Drain Fault — Water Not Pumping Out

High

E17 — Bosch Washing Machine

Water Intake Too Slow

Medium

Frequently Asked Questions

What does error code E4 mean on a Bosch Dishwasher?

Code E4 on a Bosch Dishwasher indicates "Water Intake Timeout." In practice, the most common trigger is water supply valve under sink closed. Severity is rated high, and typical repair costs range from $0 to $150.

Can I fix E4 myself, or do I need a technician?

Many cases of E4 can be resolved without a technician. The first step to try: open water supply valve fully under the sink. If that doesn't clear the code, work through the remaining steps in the "How to Fix" section above before assuming a part needs replacing.

Is it safe to keep using my dishwasher with code E4 showing?

No immediate risk. Resolve within a day.

How much does it cost to repair E4 on a Bosch Dishwasher?

Repair costs for code E4 typically range from $0 to $150. Tap and hose check: $0; Aquastop hose: $30–$70; Inlet valve: $50–$150. Costs on the low end usually reflect a DIY fix with no parts required, while the high end reflects a part replacement plus professional labor.

Estimated Repair Cost USD

$0 – $150

Tap and hose check: $0; Aquastop hose: $30–$70; Inlet valve: $50–$150