Bosch Dishwasher Error E04

⚡ Quick Answer: The Bosch dishwasher error E04 indicates a fault with the heater electronics, which can lead to mid-cycle stoppage and poor cleaning performance. This... ✅ DIY Fixable

What Does Error E04 Mean?

The Bosch dishwasher error E04 indicates a fault with the heater electronics, which can lead to mid-cycle stoppage and poor cleaning performance. This issue may be accompanied by a humming sound and a water level warning on the display. Common causes include faulty heater components, clogged spray arms, or malfunctioning water flow sensors. To resolve this, users should first perform basic troubleshooting by cleaning filters and spray arms, and resetting the appliance. If the issue persists, professional diagnosis and repairs may be necessary.

Common Symptoms:

  • Dishwasher stops mid‑cycle and displays E04
  • Poor cleaning performance
  • Possible lack of heating or disturbed water circulation

Possible Causes

  • Faulty heater electronics or heater relay/safety circuit (high)
  • Clogged spray arms or water flow obstruction (medium)
  • Malfunctioning water flow sensor / flow meter (medium)

How to Fix Error E04

DIY Fix Basic troubleshooting and maintenance

  1. Turn off and unplug the dishwasher. Wait 5–10 minutes, then reconnect to attempt to reset the error.
  2. Remove and thoroughly clean spray arms to clear any debris or limescale.
  3. Clean filters and ensure no large debris is blocking water flow inside the dishwasher.

Technician Only Diagnose heater circuitry and flow components

  1. Use a multimeter to test the heater element and associated relays for continuity.
  2. Inspect and test the water flow sensor or flow meter for correct operation.
  3. Check wiring and connectors to the heater circuit and control board for continuity and damage.

Parts needed: Heater element, Water flow sensor / flow meter, Associated wiring and relays

🛑 When to Call a Pro:
  • If E04 persists after basic cleaning and reset attempts
  • If electrical diagnostics of heater circuit show fault
  • If you are uncomfortable performing internal component checks

Technical Specifications

wattage 50W
component Drain Pump
resistance 10-30 ohms
part_number 00420258
voltage_rating 120V AC

Common Questions

What does E04 error mean on Bosch dishwasher?

E04 indicates a heater electronics fault, causing mid-cycle stoppage and poor cleaning.

Can I fix Bosch dishwasher E04 error myself?

Yes, you can attempt basic troubleshooting like cleaning filters and spray arms, and resetting the dishwasher.

How much does it cost to fix E04 error?

The estimated repair cost ranges from $120 to $350+, depending on the diagnosis and parts needed.

When should I call a technician for E04?

Call a technician if E04 persists after basic checks, or if you're uncomfortable performing internal diagnostics.

Sources & References

Data last verified: 2026-01-16

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