🌀Dryer

E:01

Bosch · WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump

Bosch WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump E:01 Error Fix: Restricted Exhaust Vent

The dryer is overheating due to a clogged or restricted exhaust air path. This is the most common dryer error. Clean the lint filter. Disconnect and thoroughly clean the entire exhaust vent run from the dryer to the outside wall cap. Check the outside vent cap for obstructions (lint, bird nests, debris). Ensure the vent duct is not crushed or kinked behind the dryer. Maximum recommended vent length is 25 feet with no elbows. Each 90° elbow reduces effective length by 5 feet.

High severity2 fixes available✨ Free fix available

Quick Answer

Error E:01 on the Bosch WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump means: Restricted Exhaust Vent. The top-ranked community fix is “Thoroughly Clean and Replace Dryer Vent Duct if Needed” (medium difficulty, ~60 min, DIY cost: $10-$30). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · dryer

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.

When to Call a Professional

While many dryer 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: $120-$180.

Other Bosch Models with Error E:01

WTG86401UC 4.0 cu ft 300 Series Condensation Dryer

dryer · 2 fixes

WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer

dryer · 2 fixes

WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer

dryer · 2 fixes

Other Bosch WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump Error Codes

E:03

Maximum Drying Time Exceeded

2 fixes

E:04

Heater Relay Stuck Open

2 fixes

E:07

Drum Motor Not Rotating

2 fixes

E:11

Restricted Exhaust — Secondary Alert

2 fixes

E:12

Restricted Exhaust — Tertiary Alert

2 fixes

E:13

Maximum Drying Time Exceeded — Repeated

2 fixes

E:17

Lint Screen Temperature Sensor Error

2 fixes

E:18

Heater Temperature Sensor Error

2 fixes

People Also Ask About Bosch WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump Error E:01

What does error code E:01 mean on a Bosch WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump?

Error code E:01 on the Bosch WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump means: Restricted Exhaust Vent. The dryer is overheating due to a clogged or restricted exhaust air path. This is the most common dryer error. Clean the lint filter. Disconnect and thoroughly clean the entire exhaust vent run from the dryer to the outside wall cap. Check the outside vent cap for obstructions (lint, bird nests, debris). Ensure the vent duct is not crushed or kinked behind the dryer. Maximum recommended vent length is 25 feet with no elbows. Each 90° elbow reduces effective length by 5 feet.

How do I fix error code E:01 on my Bosch WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump?

The most successful fix is "Thoroughly Clean and Replace Dryer Vent Duct if Needed" (medium difficulty, ~60 minutes). Estimated DIY cost: $10-$30. HomeMD has 2 community-ranked fixes for this error.

Is error code E:01 on a Bosch WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump serious?

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

Can I fix Bosch WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump error E:01 myself?

Yes — the top-ranked community fix ("Thoroughly Clean and Replace Dryer Vent Duct if Needed") is rated medium difficulty and takes about 60 minutes. Tools needed: Vacuum cleaner, Long vent cleaning brush, Screwdriver, Utility knife.

How much does it cost to repair Bosch WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump error E:01?

DIY cost: $10-$30. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Bosch WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump have?

The Bosch WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump has 8 other known error codes, including: E:03 (Maximum Drying Time Exceeded), E:04 (Heater Relay Stuck Open), E:07 (Drum Motor Not Rotating), E:11 (Restricted Exhaust — Secondary Alert), E:12 (Restricted Exhaust — Tertiary Alert), and 3 more.

Which other Bosch models have the E:01 error?

Error code E:01 also appears on 3 other Bosch models: WTG86401UC 4.0 cu ft 300 Series Condensation Dryer, WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer, WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Bosch WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump have?

The Bosch WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump has 8 other known error codes:

E:03 — Maximum Drying Time Exceeded (2 fixes)
E:04 — Heater Relay Stuck Open (2 fixes)
E:07 — Drum Motor Not Rotating (2 fixes)
E:11 — Restricted Exhaust — Secondary Alert (2 fixes)
E:12 — Restricted Exhaust — Tertiary Alert (2 fixes)
E:13 — Maximum Drying Time Exceeded — Repeated (2 fixes)
E:17 — Lint Screen Temperature Sensor Error (2 fixes)
E:18 — Heater Temperature Sensor Error (2 fixes)

Which other Bosch models have the E:01 error?

Error code E:01 also appears on 3 other Bosch models:

WTG86401UC 4.0 cu ft 300 Series Condensation Dryer (dryer) · 2 fixes
WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer (dryer) · 2 fixes
WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer (dryer) · 2 fixes

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