Roper Dryer RED4 — Timer Knob Broken Off: What Part Fixes It?
Need the replacement part? Search your model number at for guaranteed fit and fast free shipping.
Understanding the Problem
If the knob on the timer of your Roper RED4 dryer has snapped off, the dryer may still have a functional control shaft or the underlying timer mechanism may be damaged. In many cases the external plastic knob or the small plastic insert inside the knob breaks free — that’s an easy, inexpensive fix. In other cases the metal or plastic timer shaft is stripped or broken and the entire timer assembly must be replaced. Before ordering parts, inspect what’s left behind on the timer shaft. If the shaft is intact and undamaged (you can still see the D-flat or splined profile), a replacement push-on knob or an adapter insert will restore function. If the shaft is rounded, bent, or the timer won’t advance when turned, you’ll need a replacement timer/control assembly.
Common Symptoms
Knob missing or snapped off; timer won't respond to knob; difficulty selecting cycles; timer won’t advance or turn smoothly; dryer won’t start or stops mid-cycle if the control is damaged.
Common Causes
- Plastic knob or internal plastic adapter insert has cracked from normal wear or from being pulled/tugged
- Timer shaft is stripped, rounded, or broken due to over-torque or previous forced removal
- Internal timer mechanism failed so the shaft no longer engages the timer gears
Popular Parts That Fix This Problem
These are the most common replacement parts that fix this problem. When you're ready to order, click below to find the right part at PartsDiscount.com — just search by your appliance model number for a guaranteed fit.
Helpful Repair Tip
Pull the dryer away from the wall, unplug it, and remove the control panel trim to inspect the timer shaft. Measure the shaft profile (flat/diameter or splined) and note if the shaft turns the timer mechanism — that determines whether you need just a knob or the whole timer.
Frequently Asked Questions
Can I just push a new knob on myself?
Yes — if the metal or plastic timer shaft is intact and shows its original profile (flat or splined) you can usually push on a replacement knob or use a small adapter/insert. Make sure to match the knob to the shaft diameter/profile. Unplug the dryer before attempting any work.
Do I need to replace the entire timer or is the knob replacement cheaper?
Replacing only the knob or adapter is the least expensive solution and works when the shaft and internal timer are undamaged. If the shaft is rounded, bent, or the timer won’t advance, the whole timer control assembly must be replaced; that costs more and requires removing the control panel and wiring. Always confirm by inspecting the exposed shaft before ordering parts.
Real DIY Repair Stories
Be the first to share your repair story!
Share Your Repair Story
Your experience helps other homeowners fix their appliances. Tell us how it went!
Can't Fix It Yourself? Find a Local Technician
It's perfectly okay to call a professional. Some repairs require specialized tools, deep teardowns, or dealing with complex systems that are better left to the pros.
Find the Right Part for Your Appliance
Don't guess — search your exact appliance model number at PartsDiscount.com to find the correct OEM compatible replacement part. They offer fast free shipping, guaranteed fit, and thousands of parts in stock.
Your Free Parts Videos
Whether your dishwasher won't drain, your dryer stopped heating, or your fridge isn't cold, we've created simple repair guides for the most common appliance problems homeowners face. Each guide explains what's going wrong, the most likely causes, and which replacement parts fix the issue. When you're ready to order, we link directly to PartsDiscount.com where you can search by model number and get the right part shipped fast.