🌀Dryer

E:18

Bosch · WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer

Bosch WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer E:18 Error Fix: Heater Temperature Sensor Error

The temperature sensor near the heating element is reading incorrectly. This sensor monitors the air temperature at the heater to prevent overheating. Check wire harness connections. Measure sensor resistance. Replace if out of specification. A failed heater sensor can cause no-heat or overheating conditions, as the control cannot properly regulate the heating element.

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error E:18 on the Bosch WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer means: Heater Temperature Sensor Error. The top-ranked community fix is “Test and Replace Heater Temperature Sensor” (medium difficulty, ~60 min, DIY cost: $15-$25). 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:

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: $130-$200.

Other Bosch Models with Error E:18

WTG86401UC 4.0 cu ft 300 Series Condensation Dryer

dryer · 2 fixes

WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer

dryer · 2 fixes

WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump

dryer · 2 fixes

Other Bosch WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer Error Codes

E:01

Restricted Exhaust Vent

2 fixes

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

People Also Ask About Bosch WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer Error E:18

What does error code E:18 mean on a Bosch WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer?

Error code E:18 on the Bosch WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer means: Heater Temperature Sensor Error. The temperature sensor near the heating element is reading incorrectly. This sensor monitors the air temperature at the heater to prevent overheating. Check wire harness connections. Measure sensor resistance. Replace if out of specification. A failed heater sensor can cause no-heat or overheating conditions, as the control cannot properly regulate the heating element.

How do I fix error code E:18 on my Bosch WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer?

The most successful fix is "Test and Replace Heater Temperature Sensor" (medium difficulty, ~60 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

Is error code E:18 on a Bosch WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer 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 Bosch WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer error E:18 myself?

Yes — the top-ranked community fix ("Test and Replace Heater Temperature Sensor") is rated medium difficulty and takes about 60 minutes. Tools needed: T20 Torx screwdriver, Digital multimeter.

How much does it cost to repair Bosch WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer error E:18?

DIY cost: $15-$25. Professional repair typically costs $130-$200. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Bosch WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer have?

The Bosch WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer has 8 other known error codes, including: E:01 (Restricted Exhaust Vent), E:03 (Maximum Drying Time Exceeded), E:04 (Heater Relay Stuck Open), E:07 (Drum Motor Not Rotating), E:11 (Restricted Exhaust — Secondary Alert), and 3 more.

Which other Bosch models have the E:18 error?

Error code E:18 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, WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Bosch WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer have?

The Bosch WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer has 8 other known error codes:

E:01 — Restricted Exhaust Vent (2 fixes)
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)

Which other Bosch models have the E:18 error?

Error code E:18 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
WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump (dryer) · 2 fixes

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