How to Install Control Knob WP3957796 on a Whirlpool Washer
Part and Repair Overview
Control Knob WP3957796 is used on select Whirlpool washer models. The compatible models supplied for this article are:
- 110.28892790
- BYCWD6274W0
- BYCWD6274W1
- BYCWD6274W2
- BYCWD6274W3
Check your full model number before you buy or install the part. Washer model numbers often look close, but small changes can affect fit. You can usually find the model tag under the washer lid, around the cabinet opening, or on the rear panel.
The main symptom listed for this repair is:
- Washer not working properly
That symptom is broad. A bad knob is more likely when the washer still has power, but you cannot select a setting well. The knob may spin without control, feel loose, wobble, or fail to line up with cycle marks. If the washer has no power at all, a knob may not be the root cause.
For official product help and manual lookup, use Whirlpool’s Product Help Library or Service & Support manual search. Use those resources to confirm model-specific panel access and safety notes.
When the Control Knob Is the Likely Problem
A washer control knob fails in a few common ways. The plastic inside the knob can wear down. The grip area can crack. The pointer mark can become loose or misaligned. Sometimes the knob feels fine until you pull or turn it.
Look for these signs before you replace it:
- The knob spins, but the setting does not change.
- The knob pulls off too easily.
- The knob feels loose on the shaft.
- The pointer does not match the selected setting.
- You see cracks around the back of the knob.
- The washer works only when you press or hold the knob a certain way.
Do not assume the knob is bad just because the washer acts strange. If the control shaft behind the knob is broken, a new knob may not fix the washer. If the timer or control itself has failed, the knob may only be the part you notice first.
A good test is simple. Remove the knob and inspect the back. If the socket area is rounded, split, or stripped, the knob is suspect. Then inspect the shaft on the washer. It should look intact and hold its shape. If the shaft is damaged, stop and identify the control part before replacing only the knob.
Tools and Supplies You May Need
The exact tools can vary by washer design. Since no model-specific tool list was supplied, use a basic repair setup.
You may need:
- Work gloves
- A flashlight
- A small flat blade screwdriver
- A Phillips screwdriver
- Needle-nose pliers
- Painter’s tape
- A phone camera
- A towel or small tray for loose parts
Do not pry hard against the console face. Plastic panels can crack, especially on older washers. If the knob does not release with gentle force, stop and check whether a clip, retainer, or hidden fastener holds it.
Take a clear photo before you remove anything. The photo gives you a reference for knob position and cycle alignment. It also helps if you step away and come back later.
Safety Steps Before You Start
Unplug the washer before you work on the controls. Even though you are replacing an exterior knob, the control area connects to electrical parts inside the console. You should not work around live controls.
Move the washer only if you need better access. Do not pull hard on hoses or the power cord. If you must move the washer, keep the floor dry and watch the water lines.
Follow these safety steps:
- Turn the washer off.
- Unplug the power cord from the wall outlet.
- Make sure your hands are dry.
- Clear items from the washer top.
- Keep screws and clips away from the basket.
- Work in good light.
- Do not force the control shaft.
If your washer is in a tight laundry closet, give yourself room first. A rushed repair leads to broken plastic, dropped parts, and wrong alignment.
Confirm the Knob Before Removal
Before you remove the old knob, set it to a known position. Pick a clear mark on the console, such as off or a cycle label. Do not use a vague position between settings.
Place a strip of painter’s tape under the knob pointer. Mark the pointer location on the tape. This gives you a quick alignment check for the new knob.
Now touch the knob. Check how it feels:
- Does it push in and pull out?
- Does it turn with normal resistance?
- Does it wobble?
- Does it scrape the panel?
- Does it stop at normal points?
These checks matter because a knob problem can hide a control problem. If the control shaft moves in and out in a strange way, or if it feels broken behind the panel, the washer may need more than a knob.
A control knob should sit straight and turn the shaft cleanly. It should not grind against the console. It should not need side pressure to work.
How to Install Control Knob WP3957796
Original Repair Decision Matrix
Use this quick matrix before you decide whether to keep going, stop, or inspect deeper.
| What You See | What It Usually Means | What You Should Do |
|---|---|---|
| Knob is cracked on the back | Knob may not grip the shaft | Replace the knob |
| Knob spins freely | Socket may be stripped | Inspect knob and shaft |
| Shaft looks broken | Control part may be damaged | Stop and diagnose further |
| Knob rubs the panel | Knob may be misaligned | Remove and reseat it |
| Washer has no power | Problem may not be the knob | Check power and controls |
| Pointer does not match setting | Knob may be installed off-position | Realign before testing |
This table keeps the repair honest. A knob replacement is a good fix only when the knob is the failed part. If the control behind it has failed, a new knob cannot make that part healthy again.
Common Mistakes That Damage the Repair
Small washer parts often fail because someone uses too much force. Control knobs are no different. Treat the part as a fitted control piece, not a handle you can yank.
Avoid these mistakes:
- Pulling the knob at an angle
- Prying against bare console plastic
- Using pliers on the front of the knob
- Installing the knob without checking shaft damage
- Forcing a misaligned knob onto the shaft
- Testing the washer with the knob half-seated
- Losing the old knob before comparing it
Do not guess at compatibility. The supplied compatible models are listed earlier. If your model number is different, verify fit before you buy or install the part.
Also avoid cleaning the shaft with harsh chemicals. A dry cloth is usually enough. Liquid cleaners can run into the control area and cause new problems.
How the Washer Should Feel After Installation
After the new knob is installed, the control should feel stable. The knob should turn with the same type of resistance you felt when the washer worked well. It should not tilt or slide off in your hand.
The pointer should line up with the console markings. If the pointer lands between marks when it should not, remove the knob and check alignment. A knob installed one position off can confuse cycle selection.
During the test, listen and watch. Do not walk away right away. Confirm that the washer responds to the selected setting. If the washer fills, agitates, drains, or spins depends on the cycle and washer design. Do not invent a test result based only on the knob.
If the washer still acts wrong, write down what happens. Good notes help you avoid replacing random parts.
Troubleshooting After the New Knob Is Installed
A new knob should fix a loose, cracked, or stripped knob. It will not fix every control problem. If the washer is still not working properly, use a step-by-step check.
Start with power. Make sure the outlet works. Confirm the washer is plugged in. Check whether the control responds at all.
Next, check the knob fit. Pull the knob off and inspect the socket again. Make sure it did not crack during installation. Then inspect the shaft. If the shaft turns without normal resistance, the control behind it may need attention.
Look for signs that point away from the knob:
- No lights or response
- Burning smell
- Repeated breaker trips
- Water not entering
- Tub not moving
- Washer stopping mid-cycle
- Control shaft loose inside the panel
These symptoms can involve parts beyond the knob. Do not keep replacing knobs if the new one fits well but the washer still fails. You need diagnosis, not more force.
Model Number Check Before Ordering
Your model number matters. Whirlpool washers can share a brand name and still use different control parts. The supplied models for this part are limited to the list in this article.
Use the full model number from the washer tag. Do not use the sales name from a receipt. Do not use a partial number from the owner’s manual cover. The tag on the washer is the best source.
Check these areas:
- Under the washer lid
- Around the cabinet opening
- On the back panel
- Near the control area
- Around the door or frame on some designs
Write the number down exactly. Include dots, letters, and numbers. A missing character can lead to the wrong part.
If your washer is one of the supplied compatible models, Control Knob WP3957796 may match your repair need. If your model is not listed here, confirm fit before you continue.
Care Tips for the New Control Knob
A control knob lasts longer when you use it with steady pressure. Do not use it as a grab handle. Do not hang items from it. Do not turn it hard past its normal stop.
Use these care habits:
- Turn the knob with your fingertips.
- Keep the console dry.
- Wipe detergent residue from the panel.
- Do not spray cleaner into the knob area.
- Stop if the knob starts to bind.
- Fix a loose knob before it strips further.
Laundry rooms can be damp. Moisture and detergent film can make controls sticky. Clean the panel with a damp cloth, then dry it. Keep liquid away from the shaft area.
If the knob ever feels loose again, inspect it early. A small crack can grow into a stripped socket.
What to Do Next
Need help finding the right part for your Whirlpool washer?
FAQ
Final Repair Checklist
Use this checklist before you call the repair complete:
- You unplugged the washer before starting.
- You checked the full model number.
- You marked or photographed the knob position.
- You removed the old knob without side force.
- You inspected the old knob for cracks or stripping.
- You checked the control shaft for visible damage.
- You aligned the new knob before pressing it on.
- You seated the knob evenly.
- You tested knob movement before restoring power.
- You confirmed the washer responds after installation.
A Whirlpool washer control knob repair works best when you slow down and inspect each contact point. The knob, shaft, and console must all line up. If they do, the new knob should feel firm and predictable. If they do not, stop and diagnose the control area before you damage the new part.