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Bosch·Dishwasherhigh severity
Bosch Dishwasher Error Code E04
Heater electronics error
Common Causes
- 1Heater control circuit failure
- 2Triac fault
- 3Board damage
Triac failure can cause heater to run continuously. Disconnect power immediately if water is overheating or steaming excessively.
Step-by-Step Troubleshooting
- 1
Disconnect power and access the control board
- 2
Measure heater element resistance (expect 10-20 ohms)
- 3
Check triac on control board for short circuit
- 4
Verify wiring between board and heater element for damage
Pro Diagnostic Tip
E04 is a heater-electronics fault: the triac that switches the flow-through heater has shorted or the board can no longer control it. Sacramento hard water accelerates scale on the inline heater, raising current draw until the triac fails, so descale before condemning the board — a scaled heater will just take out the replacement triac too. Unlike E09 (an open heating element), E04 is the control side of heating, which is why it can leave the heater stuck ON and steaming rather than cold.
You Might Also Notice
- •Water not heating during the cycle
- •Cycle stuck in the wash phase
- •Burning or hot-electronics smell from the base
- •Excessive steam or an over-hot door
- •Dishes come out cool and greasy
Parts, Cost & Difficulty
Repair Difficulty
Hard — Advanced Skills RequiredEstimated Repair Cost
$280–$450
Parts + labor. Free diagnosis with repair.
Parts That May Need Replacement
12-005-668-001 (main control board)12-014-872-001 (heater element assembly)
Do You Have the Right Tools?
Bearing puller set ($120), drum spider wrench ($85), multimeter ($85), and diagnostic software. Our technician arrives with $3,000+ in professional tools — your diagnostic is free.
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High-voltage components and pressurized water lines create flood and shock risk. A single loose fitting can cause thousands in water damage. Our techs are licensed and insured — let them handle the risk.
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Get Professional Help Now
Error code E04 is a high-severity issue that can cause further damage to your dishwasher if left unresolved. A licensed technician can diagnose and fix it the same day.
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Frequently Asked Questions
What does Bosch error code E04 mean?
Bosch error code E04 indicates: Heater electronics error. This is a high-severity issue affecting your dishwasher.
How do I fix Bosch error code E04?
Disconnect power and access the control board Then, Measure heater element resistance (expect 10-20 ohms) Then, Check triac on control board for short circuit There are 1 more steps — see the full troubleshooting guide above. This repair typically requires professional tools and expertise.
How do I know if my dishwasher has error E04?
Besides the error code on the display, common signs include: Water not heating during the cycle; Cycle stuck in the wash phase; Burning or hot-electronics smell from the base. If you notice any of these symptoms, check your dishwasher's display panel for error code E04.
How much does it cost to fix Bosch E04?
Repair costs for Bosch E04 typically range from $280 to $450 depending on the specific cause and parts needed. EasyBear offers free diagnosis when you proceed with the repair. Call (415) 795-7300 for a same-day appointment.
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