🍽️Dishwasher

E03

Thermador · DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi

Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi E03 Error Fix: Door Lock Switch Fault

The dishwasher’s door lock switch is not engaging or signaling properly, preventing the dishwasher from starting the cycle. This error ensures the dishwasher will not operate if the door is not securely closed.

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error E03 on the Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi means: Door Lock Switch Fault. The top-ranked community fix is “Replace Door Lock Assembly” (medium difficulty, ~30 min, DIY cost: $30-$45). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · dishwasher

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

Root Cause Analysis

Sensor Malfunction → Door Switch FaultyPrimary

When to Call a Professional

While many dishwasher repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $110-$160.

Other Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi Error Codes

E01

Water Inlet Valve Failure

2 fixes

E02

Drain Pump Malfunction

2 fixes

E04

Heating Element Failure

Float Switch Stuck

Control Board Failure

2 fixes

E07

Temperature Sensor Error

Water Leak Detected

Detergent Dispenser Fault

2 fixes

People Also Ask About Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi Error E03

What does error code E03 mean on a Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi?

Error code E03 on the Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi means: Door Lock Switch Fault. The dishwasher’s door lock switch is not engaging or signaling properly, preventing the dishwasher from starting the cycle. This error ensures the dishwasher will not operate if the door is not securely closed.

How do I fix error code E03 on my Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi?

The most successful fix is "Replace Door Lock Assembly" (medium difficulty, ~30 minutes). Estimated DIY cost: $30-$45. HomeMD has 2 community-ranked fixes for this error.

Is error code E03 on a Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi error E03 myself?

Yes — the top-ranked community fix ("Replace Door Lock Assembly") is rated medium difficulty and takes about 30 minutes. Tools needed: Phillips screwdriver, Needle-nose pliers.

How much does it cost to repair Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi error E03?

DIY cost: $30-$45. Professional repair typically costs $110-$160. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi have?

The Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi has 8 other known error codes, including: E01 (Water Inlet Valve Failure), E02 (Drain Pump Malfunction), E04 (Heating Element Failure), E05 (Float Switch Stuck), E06 (Control Board Failure), and 3 more.

What other error codes does the Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi have?

The Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi has 8 other known error codes:

E01 — Water Inlet Valve Failure (2 fixes)
E02 — Drain Pump Malfunction (2 fixes)
E04 — Heating Element Failure (2 fixes)
E05 — Float Switch Stuck (2 fixes)
E06 — Control Board Failure (2 fixes)
E07 — Temperature Sensor Error (2 fixes)
E08 — Water Leak Detected (2 fixes)
E09 — Detergent Dispenser Fault (2 fixes)

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