Clothes dryer with its vent duct in a small laundry closet
6 components covered

Field manual · Dryer

Whirlpool HybridCare heat-pump dryer (27-inch, ventless): field service manual

Covers: Whirlpool HybridCare full-size ventless heat-pump dryers (WHD-series, about 2015 onward). Series names only.

Single sourceBrands: Whirlpool6 components

A full-size 27-inch ventless dryer that dries with a heat pump and drains condensate through a pump to a standpipe or sink. It has a lint screen in the door opening plus a HybridCare filter in a lower cabinet, and a permanent metal screen in front of the evaporator. Lint that gets past the filters onto the coils is the main long-term problem.

Safety first

  • Unplug before service.
  • Sealed system: EPA 608-certified technician only.
  • Fins are sharp.

How it works

Air loop: air leaves the drum through the door lint screen, then the HybridCare filter in the bottom cabinet and a fixed metal screen, then passes the evaporator (moisture condenses) and the condenser (air reheats) before returning to the drum. Whirlpool describes it as recycling the same air through a refrigeration system.

Water: condensate collects in a reservoir and a dedicated drain pump sends it to a standpipe, laundry tub or washer drain. A float in that reservoir can be fouled by lint.

Cooling: a cooling fan screen at the lower right rear lets the heat pump reject heat into the room; it must be vacuumed and kept clear.

Service access: thorough coil cleaning requires disassembly (top, front, belt, blower, drain pump and reed lint switch per Whirlpool's job aid); owners report several hours for the job. The owner's manual says coil lint removal is a servicer task, about every two years or more often.

Components & tests

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Official manufacturer documentation

Always confirm values against the tech sheet for the exact model.

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): Clothes dryer with its vent duct in a small laundry closet by Introspectivedsgn, Pexels License

Diagnostic guides for this appliance

Guide · Dryer

Ventless dryer not drying: cleaning the filters, condenser and heat exchanger

Ventless dryers depend on clean air passages. Lint that gets past the door filter settles on the condenser or heat exchanger and drying time climbs. Clean every filter stage first, then the condenser or exchanger, then check the water path.

8 steps ~40 mineasy
Guide · Dryer

Dryer squeaks, squeals or thumps: drum rollers, idler pulley, glides and rear bearing

Drum noise usually comes from four wear parts: the drum support rollers (thump, squeak), the idler pulley (squeal or whine), the front glides or bearing slides (scraping) and, on some designs, a rear drum bearing (squeal, drum moves front to back). Take the belt off and turn the drum by hand to find which one it is. Replace rollers as a set.

9 steps ~75 minmoderate
Guide · Dryer

Replacing a broken or slipping dryer drum belt

A broken belt leaves the motor spinning with no drum movement. Open the cabinet, put the new belt around the drum with the ribbed side against the drum, then route it through the idler and onto the motor pulley. Inspect the idler and rollers while you are in there.

7 steps ~50 minmoderate

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Miele T1 compact heat-pump dryers sold in the US (TWI180WP and related T1 WP models). Series names only.

6 components5 common failuresMiele
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Bosch 300/500/800 compact 24-inch dryer (condensation and heat pump): field service manual

Bosch 24-inch compact ventless dryers sold in the US: 300 Series condensation (WTG86-series) and 500/800 Series heat-pump (WQB- and WTW-series). Series names only.

7 components5 common failuresBosch
Manual · Dryer

Gas dryer ignition system, electrical side (Whirlpool/Maytag and GE): field service manual

Residential gas dryers with a hot-surface (glow-bar) igniter, a radiant flame sensor and a two-coil gas valve: Whirlpool-built 29-inch and GE-built gas dryers. Electrical diagnosis only.

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Whirlpool HybridCare heat-pump dryer (27-inch, ventless): field service manual · OnCall Tech