Ceiling-mounted chain-drive garage door opener with its rail
9 components covered

Field manual · Trash Compactor

KitchenAid / Whirlpool 15-in built-in trash compactors (KTTS505E, KTTP515T and older Whirlpool GC900-class): quick sheet

Covers: Whirlpool-built 15-in undercounter compactors: KitchenAid KTTS505E (stainless / panel-ready) and the newer KTTP515T with built-in odor management, plus older Whirlpool GC900 / GX900-class and KUCS-family units that share the two-power-screw, chain-drive layout. Read the model and serial from the label inside the drawer opening.

Single sourceBrands: KitchenAid, Whirlpool, Maytag, Jenn-Air, Kenmore (Whirlpool-built)9 components

The only full-size compactor line still widely installed in US kitchens. A motor in the bottom of the cabinet turns two vertical power screws through a chain and sprockets; nuts on the ram ride the screws down to compact and back up to park. Start logic runs through a key knob, a drawer safety switch, a tilt switch on the bin and a top-limit / directional switch, so most no-start and won't-stop calls are switch calls. Retail listings disagree on the compaction ratio (4:1 vs 5:1) and on the circuit rating, so read the install sheet for the exact model.

Safety first

  • Unplug or switch off the breaker before any test; built-in units often hide the outlet behind the cabinet.
  • Keep hands out from under the ram; never bypass the drawer or tilt switch.

How it works

Turning the key knob to start (with the drawer fully closed) energises the motor through the drawer safety switch and the start circuit. The ram travels down on the two power screws until trash resistance slows the motor.

Reversal is mechanical and electrical: when load slows the motor, the motor's centrifugal switch and the directional switch reverse the motor so the ram climbs back up. At the top, the top-limit / directional switch opens and the cycle ends.

A tilt switch on the bin reverses the ram and sends it home if the bin tilts during compaction (the bin on these units tilts out sideways for bag removal).

Odor control is a small fan with a charcoal filter on newer units, switched separately from the compaction circuit. 'Solid Pack' is a marketing name for the packing mode; listings quote up to about 80% volume reduction.

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): Ceiling-mounted chain-drive garage door opener with its rail by Dave Dugdale, CC BY-SA 2.0

Diagnostic guides for this appliance

Guide · Trash Compactor

Trash compactor won't stop: ram keeps cycling or runs past the top

A compactor stops when the ram returns to the top and trips the top-limit/directional switch, which also tells the motor which way to run. If the ram never stops, suspect that switch or its actuator, a start/run or push-button switch stuck closed, or a motor centrifugal/reversing switch problem. Unplug before any check.

7 steps ~60 minmoderate
Guide · Trash Compactor

Trash compactor doesn't compact well (ram goes down but trash stays loose)

Weak compaction on a power-screw compactor usually means the ram isn't getting full force: worn or stripped power nuts, a slipping or broken drive gear or sprocket chain, or worn screws. Running the unit nearly empty is a common cause of gear damage. Inspect from below with the unit unplugged and pulled out.

7 steps ~90 minmoderate
Guide · Trash Compactor

Trash compactor won't start: test the key, drawer, tilt and top-limit switches

A compactor start circuit is a chain of switches in series. Prove the outlet first, then continuity-test each switch with the power off: on-off / key switch, momentary start, drawer safety, tilt and top-limit / directional. If every switch passes, the motor's centrifugal switch, the motor or the wiring is next.

8 steps ~60 minmoderate

Other trash compactors manuals

Manual · Trash Compactor

Broan Elite 15-in trash compactors (15WH / 15BL / 15SS / 15WT / 15TT and 15XE series): quick sheet

Broan Elite 15-in built-in / convertible compactors covered by the 15WT-family owner's manual (15WH, 15BL, 15SS, 15WT, 15TT) and the 15XE-family manual (15XEWH, 15XEBL, 15XESS, 15XESSA, 15XEWT, 15XETT). Many of these are discontinued; parts availability is limited.

6 components5 common failuresBroan, Broan-NuTone
Manual · Trash Compactor

Power-screw / chain-drive trash compactors: field service manual

15-in built-in and freestanding compactors with a motor driving two power screws through a chain and gears, key-knob or push-button controls. Own summary.

7 components4 common failuresWhirlpool, KitchenAid, GE, Broan
KitchenAid / Whirlpool 15-in built-in trash compactors (KTTS505E, KTTP515T and older Whirlpool GC900-class): quick sheet · OnCall Tech