Bosch · Dishwasher error code

E03Control board relay fault

Cross-checked Power off, standard tools

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Related diagnostic guides

Guide · Dishwasher

Dishwasher not heating water

Confirm the supply water is hot first, then test the heater (or Bosch heat pump heater), the high-limit and the thermistor. If all test good, suspect the heater relay on the control.

5 steps ~60 minmoderate

Component test · Dishwasher

How to test a dishwasher heating element

Many US dishwashers have a hidden or visible loop element under the tub. A good one reads in the tens of ohms. A leak to the tub trips the GFCI even when the resistance looks fine, so always check to ground.

5 steps ~20 mineasy

Component test · Dishwasher

How to test a dishwasher circulation (wash) pump motor

The wash motor pushes water to the spray arms. Older units use an AC induction motor; many newer ones use a brushless DC motor driven by the board. Rule out a jam and a filter clog before testing, and use the tech sheet for winding values.

6 steps ~45 minmoderate

More Bosch dishwasher codes

Bosch · Dishwasher

E01 / E0100

Control board fault (pump/heater circuit)

Cross-checked

Bosch · Dishwasher

E02 / E0103

Control board relay fault

Cross-checked

Bosch · Dishwasher

E04 / E0105

Heating electronics fault

Cross-checked

Bosch · Dishwasher

E05 / E0106

Diverter circuit fault (per Bosch)

Single source

Bosch · Dishwasher

E06 / E8000

Door sensor circuit fault

Cross-checked

Bosch · Dishwasher

E07 / E2130

Drying fan fault

Cross-checked