Bosch Dishwasher Error E03

⚡ Quick Answer: The Bosch dishwasher error E03 indicates a malfunction in the auxiliary heater relay on the main control board. This issue can cause the dishwasher to... ✅ DIY Fixable

What Does Error E03 Mean?

The Bosch dishwasher error E03 indicates a malfunction in the auxiliary heater relay on the main control board. This issue can cause the dishwasher to stop mid-cycle, fail to heat properly, and in some models, not fill with water. Unusual noises may also accompany this error, signaling a need for further inspection and repair.

Common Symptoms:

  • Dishwasher stops mid‑cycle and displays E03
  • Dishwasher fails to heat properly
  • Dishwasher may fail to fill with water in some models

Possible Causes

  • Main control board relay fault (auxiliary heater relay) (high)
  • Faulty water inlet valve preventing proper water fill (model dependent) (medium)

How to Fix Error E03

DIY Fix Basic checks and reset

  1. Turn off the dishwasher and cut power at the breaker for 30 seconds, then restore power to see if error clears.
  2. Ensure the water supply is turned on and hoses are not kinked or blocked.
  3. Check and clean any accessible filters that might restrict water flow.

Technician Only Control board and component diagnosis

  1. Disconnect power and access the dishwasher’s control board.
  2. Inspect the auxiliary heater relay on the main control board for signs of failure.
  3. Test the water inlet valve for continuity and proper operation.
  4. Replace the faulty control board relay or water inlet valve as appropriate.

Parts needed: Control board (with auxiliary heater relay), Water inlet valve

🛑 When to Call a Pro:
  • If error persists after basic user checks and reset
  • If internal components like the control board or inlet valve need testing or replacement

Technical Specifications

wattage 40W
component Drain Pump
resistance 10-30 ohms
part_number Bosch 00410300
voltage_rating 120V AC

Common Questions

What does E03 error mean on Bosch dishwasher?

E03 indicates a fault in the auxiliary heater relay on the main control board, affecting heating and operation.

Can I fix Bosch dishwasher E03 error myself?

Yes, you can perform basic checks like resetting the dishwasher and ensuring the water supply is on.

How much does it cost to fix E03 error?

Estimated repair costs range from $150 to $500+, depending on parts and service rates.

When should I call a technician for E03?

Call a technician if the error persists after troubleshooting or if internal components need testing or replacement.

Sources & References

Data last verified: 2026-01-16

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