Basement laundry area with a top-load washer and dryer next to utility equipment
8 components covered

Field manual · Washer

Whirlpool WTW4816F / WTW4955H-series top-load washer: quick sheet

Covers: Whirlpool WTW4816FW (3.5 cu ft, dual-action spiral agitator) and WTW4955HW (3.8 cu ft, two-way wash agitator), with their engineering revisions. Years not confirmed by our sources; the F and H letters are Whirlpool introduction-year letters, so the H model is the later of the two. WTW4816FW is listed as discontinued.

Single sourceBrands: Whirlpool8 components

Budget agitator top-loaders with knob consoles, aimed at customers who want a traditional agitator. Same family of electronic drive, shifter and lid-lock logic as other Whirlpool HE top-loads of the period, so the F-code list and diagnostic approach carry over. Deep diagnostics: see the Whirlpool / Maytag top-load washer field service manual.

Safety first

  • Unplug the washer and shut both water valves before opening the cabinet or console.
  • Live-voltage checks in diagnostic mode only with insulated probes and one hand clear; never reach into the basket while the drive is commanded.
  • Drain the tub (or bail it) before tipping the washer or pulling the drive; a full tub is very heavy and floods the floor.

How it works

The control locks the lid, senses the load and fills to a level set by the pressure sensor (deeper-water options exist on these agitator models).

WTW4816F uses a dual-action spiral agitator; WTW4955H uses a two-way wash action in which agitator and basket turn opposite ways. Both rely on the shifter to switch between agitate and spin.

Spin is checked through the rotor position sensor; drive faults land in the F7 family and lid faults in the F5 family.

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): Basement laundry area with a top-load washer and dryer next to utility equipment by Đỗ Huy Hoàng, Pexels License

Diagnostic guides for this appliance

Component test · Washer

How to test a drain pump (washer and dishwasher)

Most drain pumps are small synchronous motors. Clear the filter and impeller first, then test the winding and the voltage. Published resistance values vary a lot by brand, so use the tech sheet for the number.

6 steps ~40 minmoderate
Component test · Washer

How to test a universal (brushed) motor and its carbon brushes

Universal motors run on AC or DC through carbon brushes that rub on a commutator. Brushes wear out and are the most common failure. Check brush length and the commutator, then test the field and armature with a meter.

6 steps ~60 minmoderate
Component test · Washer

How to test a top-load washer lid switch / lid lock

Older top-loaders use a simple lid switch; most newer ones use a lid lock with a switch and a locking solenoid or motor. Test the switch contacts with the lid open and closed, and check the lock coil if there is one.

6 steps ~20 minmoderate

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Manual · Washer

Fisher & Paykel SmartDrive top-load washer: field service manual

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6 components3 common failuresFisher & Paykel
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Electrolux premium appliances: what differs from Frigidaire

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Compact & budget portable washers: field service manual

Portable and compact top-load washers (about 1.6-2.0 cu ft) that connect to a sink with a quick-connect adapter, plus simple twin-tub units.

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Whirlpool WTW4816F / WTW4955H-series top-load washer: quick sheet · OnCall Tech