🍽️Dishwasher

E20

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 E20 Error Fix: Firmware Corruption Detected

The dishwasher's control board firmware is corrupted, causing erratic operation or failure to start. Firmware corruption can result from power surges or failed updates.

critical2 fixes available✨ Free fix available

Quick Answer

Error E20 on the Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi means: Firmware Corruption Detected. The top-ranked community fix is “Replace Control Board” (hard difficulty, ~90 min, DIY cost: $160-$220). 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

Control Board Failure → Firmware CorruptionPrimary

Control Board Failure

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: $300-$450.

Other Thermador Models with Error E20

ME302WS Masterpiece Wall Oven

oven · 2 fixes

T18IF905SP 18 in Column Freezer with 5.1 cu ft Capacity and LED Lighting

refrigerator · 2 fixes

T36BB925SS 36 in 20.9 cu ft Freedom® Collection Built-In French Door Refrigerator with ThermaFresh System

refrigerator · 2 fixes

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

E03

Door Lock Switch Fault

2 fixes

E04

Heating Element Failure

Float Switch Stuck

Control Board Failure

2 fixes

E07

Temperature Sensor Error

2 fixes

E08

Water Leak Detected

2 fixes

People Also Ask About Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi Error E20

What does error code E20 mean on a Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi?

Error code E20 on the Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi means: Firmware Corruption Detected. The dishwasher's control board firmware is corrupted, causing erratic operation or failure to start. Firmware corruption can result from power surges or failed updates.

How do I fix error code E20 on my Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi?

The most successful fix is "Replace Control Board" (hard difficulty, ~90 minutes). Estimated DIY cost: $160-$220. HomeMD has 2 community-ranked fixes for this error.

Is error code E20 on a Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi serious?

This error is rated critical severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Can I fix Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi error E20 myself?

Yes — the top-ranked community fix ("Replace Control Board") is rated hard difficulty and takes about 90 minutes. Tools needed: Phillips screwdriver, Torx screwdriver.

How much does it cost to repair Thermador DWHD770WFP 24 in 39 dBA Emerald Series Dishwasher with Steam Cleaning and WiFi error E20?

DIY cost: $160-$220. Professional repair typically costs $300-$450. 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), E03 (Door Lock Switch Fault), E04 (Heating Element Failure), E05 (Float Switch Stuck), and 3 more.

Which other Thermador models have the E20 error?

Error code E20 also appears on 3 other Thermador models: ME302WS Masterpiece Wall Oven, T18IF905SP 18 in Column Freezer with 5.1 cu ft Capacity and LED Lighting, T36BB925SS 36 in 20.9 cu ft Freedom® Collection Built-In French Door Refrigerator with ThermaFresh System. The fix may vary by model, so check each model's specific page for tailored repair steps.

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)
E03 — Door Lock Switch Fault (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)

Which other Thermador models have the E20 error?

Error code E20 also appears on 3 other Thermador models:

ME302WS Masterpiece Wall Oven (oven) · 2 fixes
T18IF905SP 18 in Column Freezer with 5.1 cu ft Capacity and LED Lighting (refrigerator) · 2 fixes
T36BB925SS 36 in 20.9 cu ft Freedom® Collection Built-In French Door Refrigerator with ThermaFresh System (refrigerator) · 2 fixes

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