e03
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Bosch · Dishwashers
Auxiliary heater relay fault / water fill issue
Quick Answer
Error code E03 on your Bosch Dishwashers means: Auxiliary heater relay fault / water fill issue. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Turn off the dishwasher and unplug it for 30 seconds, then restart.
2
Check if the dishwasher is filling with water. If not, inspect the water inlet valve.
3
Test the water inlet valve with a multimeter for continuity.
4
Contact a Bosch-certified technician for control board diagnosis and replacement.
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Parts You May Need
Water inlet valve
Main control board
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