🌀Dryer

E:12

Bosch · WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer

Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer E:12 Error Fix: Restricted Exhaust — Tertiary Alert

Same as E:01 and E:11 — continued overheating due to restricted airflow. At this third alert level, the dryer may lock out and refuse to start until the vent issue is resolved. Completely clean the exhaust system. Consider having the vent professionally cleaned if you cannot access the full duct run. Inspect for crushed or disconnected ductwork in the wall.

High severity2 fixes available✨ Free fix available

Quick Answer

Error E:12 on the Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer means: Restricted Exhaust — Tertiary Alert. The top-ranked community fix is “Professional Exhaust Duct Inspection and Repair” (hard difficulty, ~90 min, DIY cost: $15-$20). 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: $150-$250.

Other Bosch Models with Error E:12

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: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 WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer Error E:12

What does error code E:12 mean on a Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer?

Error code E:12 on the Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer means: Restricted Exhaust — Tertiary Alert. Same as E:01 and E:11 — continued overheating due to restricted airflow. At this third alert level, the dryer may lock out and refuse to start until the vent issue is resolved. Completely clean the exhaust system. Consider having the vent professionally cleaned if you cannot access the full duct run. Inspect for crushed or disconnected ductwork in the wall.

How do I fix error code E:12 on my Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer?

The most successful fix is "Professional Exhaust Duct Inspection and Repair" (hard difficulty, ~90 minutes). Estimated DIY cost: $15-$20. HomeMD has 2 community-ranked fixes for this error.

Is error code E:12 on a Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer serious?

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

Can I fix Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer error E:12 myself?

Yes — the top-ranked community fix ("Professional Exhaust Duct Inspection and Repair") is rated hard difficulty and takes about 90 minutes. Tools needed: T20 Torx screwdriver, Flashlight, Professional vent cleaning brush, Vacuum cleaner with hose.

How much does it cost to repair Bosch WTG865H4UC 4.0 cu ft 800 Series Condensation Dryer error E:12?

DIY cost: $15-$20. Professional repair typically costs $150-$250. 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:12 error?

Error code E:12 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: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:12 error?

Error code E:12 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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