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Thermador · DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity

Thermador DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity E1 Error Fix: Water Inlet Valve Error

This error indicates that the dishwasher is not filling with water properly. It is triggered when the inlet valve does not open or water flow is insufficient, causing the cycle to pause or stop.

High severity2 fixes available

Quick Answer

Error E1 on the Thermador DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity means: Water Inlet Valve Error. The top-ranked community fix is “Replace Water Inlet Valve” (hard difficulty, ~45 min, DIY cost: $45-$60). 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

Water Supply IssuePrimary

When to Call a Professional

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

This is a high severity error — continued use may cause damage or a safety hazard
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: $150-$220.

Other Thermador Models with Error E1

ME302WS Masterpiece Wall Oven

oven · 1 fix

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

refrigerator · 2 fixes

T30IR905SP 30 in Column Refrigerator with 15.5 cu ft Capacity, WiFi, and ThermaFresh System

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 DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity Error Codes

Drain Pump Failure

2 fixes

Door Lock Failure

2 fixes

Heater Element Failure

2 fixes

Water Temperature Sensor Fault

2 fixes

Control Board Communication Error

2 fixes

Overflow Water Detected

2 fixes

Water Level Sensor Malfunction

2 fixes

Spray Arm Motor Fault

2 fixes

People Also Ask About Thermador DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity Error E1

What does error code E1 mean on a Thermador DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity?

Error code E1 on the Thermador DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity means: Water Inlet Valve Error. This error indicates that the dishwasher is not filling with water properly. It is triggered when the inlet valve does not open or water flow is insufficient, causing the cycle to pause or stop.

How do I fix error code E1 on my Thermador DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity?

The most successful fix is "Replace Water Inlet Valve" (hard difficulty, ~45 minutes). Estimated DIY cost: $45-$60. HomeMD has 2 community-ranked fixes for this error.

Is error code E1 on a Thermador DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity serious?

This error is rated high severity. You should address it promptly — continued use could cause damage or safety concerns.

Can I fix Thermador DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity error E1 myself?

Yes — the top-ranked community fix ("Replace Water Inlet Valve") is rated hard difficulty and takes about 45 minutes. Tools needed: Phillips screwdriver, Pliers, Multimeter.

How much does it cost to repair Thermador DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity error E1?

DIY cost: $45-$60. Professional repair typically costs $150-$220. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Thermador DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity have?

The Thermador DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity has 8 other known error codes, including: E2 (Drain Pump Failure), E3 (Door Lock Failure), E4 (Heater Element Failure), E5 (Water Temperature Sensor Fault), E6 (Control Board Communication Error), and 3 more.

Which other Thermador models have the E1 error?

Error code E1 also appears on 4 other Thermador models: ME302WS Masterpiece Wall Oven, T18IF905SP 18 in Column Freezer with 5.1 cu ft Capacity and LED Lighting, T30IR905SP 30 in Column Refrigerator with 15.5 cu ft Capacity, WiFi, and ThermaFresh System, 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 DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity have?

The Thermador DWHD660WFM 24 in 42 dBA Sapphire Series Dishwasher with Star Dry and WiFi Connectivity has 8 other known error codes:

E2 — Drain Pump Failure (2 fixes)
E3 — Door Lock Failure (2 fixes)
E4 — Heater Element Failure (2 fixes)
E5 — Water Temperature Sensor Fault (2 fixes)
E6 — Control Board Communication Error (2 fixes)
E7 — Overflow Water Detected (2 fixes)
E8 — Water Level Sensor Malfunction (2 fixes)
E9 — Spray Arm Motor Fault (2 fixes)

Which other Thermador models have the E1 error?

Error code E1 also appears on 4 other Thermador models:

ME302WS Masterpiece Wall Oven (oven) · 1 fix
T18IF905SP 18 in Column Freezer with 5.1 cu ft Capacity and LED Lighting (refrigerator) · 2 fixes
T30IR905SP 30 in Column Refrigerator with 15.5 cu ft Capacity, WiFi, and ThermaFresh System (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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