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Thermador·Dishwasherhigh severity
Thermador Dishwasher Error Code E04
Heater electronics / triac fault
Common Causes
- 1Heater triac shorted on the board
- 2Flow-through heater drawing excess current
- 3Wiring fault between board and heater
A shorted triac can energize the heater continuously. If the tub is steaming or water is scalding, kill power immediately and do not restart until the board is replaced.
Step-by-Step Troubleshooting
- 1
Disconnect power and reach the inline flow-through heater that sits in the circulation loop below the Thermador tub
- 2
Read the heater element resistance at its terminals — expect roughly ten to twenty ohms, and treat an open reading as a failed element
- 3
Inspect the heater triac on the control board for a shorted junction, which lets the heater run without command
- 4
Trace the harness from board to heater for chafed insulation or a discolored connector caused by sustained overcurrent
Pro Diagnostic Tip
Sacramento-area hard water scales the inline heater and raises its current draw until the board triac fails. Descale the machine and confirm the element resistance is in-band, or a fresh board will fail the same way within months.
You Might Also Notice
- •Water never heats through the cycle
- •Program stalls in the wash phase
- •Burning smell near the base
- •Steam or overheating during the heated phase
Parts, Cost & Difficulty
Repair Difficulty
Hard — Advanced Skills RequiredEstimated Repair Cost
$280–$520
Parts + labor. Free diagnosis with repair.
Parts That May Need Replacement
Main control boardFlow-through heater 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 Thermador error code E04 mean?
Thermador error code E04 indicates: Heater electronics / triac fault. This is a high-severity issue affecting your dishwasher.
How do I fix Thermador error code E04?
Disconnect power and reach the inline flow-through heater that sits in the circulation loop below the Thermador tub Then, Read the heater element resistance at its terminals — expect roughly ten to twenty ohms, and treat an open reading as a failed element Then, Inspect the heater triac on the control board for a shorted junction, which lets the heater run without command 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 never heats through the cycle; Program stalls in the wash phase; Burning smell near 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 Thermador E04?
Repair costs for Thermador E04 typically range from $280 to $520 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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