🌀Dryer

E:28

Bosch · WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer

Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer E:28 Error Fix: Moisture Sensor Fault

The moisture sensor bars inside the drum are not reading correctly. The sensor bars detect the moisture level in the laundry to determine when the load is dry. Clean the sensor bars (two metal strips on the inside of the drum near the lint filter) with fine sandpaper or rubbing alcohol — fabric softener and dryer sheet residue coats the bars and reduces accuracy. If cleaning does not help, check the wiring from the sensor bars to the control board. Replace the sensor assembly if defective.

Medium severity2 fixes available

Quick Answer

Error E:28 on the Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer means: Moisture Sensor Fault. The top-ranked community fix is “Test and Replace Moisture Sensor Assembly” (medium difficulty, ~45 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: $150-$220.

Other Bosch Models with Error E:28

WTG86401UC 4.0 cu ft 300 Series Condensation Dryer

dryer · 2 fixes

WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer

dryer · 2 fixes

WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump

dryer · 2 fixes

Other Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation 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 WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer Error E:28

What does error code E:28 mean on a Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer?

Error code E:28 on the Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer means: Moisture Sensor Fault. The moisture sensor bars inside the drum are not reading correctly. The sensor bars detect the moisture level in the laundry to determine when the load is dry. Clean the sensor bars (two metal strips on the inside of the drum near the lint filter) with fine sandpaper or rubbing alcohol — fabric softener and dryer sheet residue coats the bars and reduces accuracy. If cleaning does not help, check the wiring from the sensor bars to the control board. Replace the sensor assembly if defective.

How do I fix error code E:28 on my Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer?

The most successful fix is "Test and Replace Moisture Sensor Assembly" (medium difficulty, ~45 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

Is error code E:28 on a Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation 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 WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer error E:28 myself?

Yes — the top-ranked community fix ("Test and Replace Moisture Sensor Assembly") is rated medium difficulty and takes about 45 minutes. Tools needed: Phillips screwdriver, Multimeter.

How much does it cost to repair Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer error E:28?

DIY cost: $15-$25. Professional repair typically costs $150-$220. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer have?

The Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation 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:28 error?

Error code E:28 also appears on 3 other Bosch models: WTG86401UC 4.0 cu ft 300 Series Condensation Dryer, WTW87NH1UC 4.0 cu ft 800 Series Heat Pump 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 WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer have?

The Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation 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:28 error?

Error code E:28 also appears on 3 other Bosch models:

WTG86401UC 4.0 cu ft 300 Series Condensation Dryer (dryer) · 2 fixes
WTW87NH1UC 4.0 cu ft 800 Series Heat Pump Dryer (dryer) · 2 fixes
WTW87NH2UC 4.0 cu ft 800 Series Smart Heat Pump (dryer) · 2 fixes

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