Roper RED4516 Dryer — Timer Knob Broken Off (How to Fix)
Need the replacement part? Search your model number at for guaranteed fit and fast free shipping.
Understanding the Problem
If the timer knob has broken off your Roper RED4516 dryer, it may be a simple cosmetic/operational issue (a replacement knob will restore control) or a sign of deeper damage to the timer shaft or timer mechanism. Often the plastic knob snaps off while the internal splines on the timer shaft remain intact — in that case you only need a replacement knob or a compatible universal knob. If the shaft splines are stripped or the timer won’t turn smoothly, the timer assembly itself may need replacement. Before ordering parts, it’s important to determine whether the problem is limited to the plastic knob or involves the timer switch/shaft. A correctly fitting knob will slide onto the timer shaft (splined or D-shaped) and restore function quickly. If the shaft is damaged or the timer binding, replacing the entire timer or timer switch is the reliable fix to restore safe, functional control of cycles and timing.
Common Symptoms
Missing or broken plastic knob; timer won’t turn by hand or won’t advance; dryer stuck on a single cycle or won’t start; knob turns but cycle doesn’t change (slipping).
Common Causes
- Plastic knob snapped off from normal use, impact, or cold/aged plastic
- Stripped or damaged splines on the timer shaft so a knob can’t engage
- Internal timer/timer switch wear or damage causing binding or slipping
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 remaining plastic off the shaft (use pliers if needed), then try turning the bare timer shaft with pliers. If the shaft turns smoothly and cycles register, you only need a replacement knob; if it’s loose, slips, or doesn’t advance, replace the timer assembly.
Frequently Asked Questions
How do I remove the broken knob and check the timer shaft?
Unplug the dryer first. If plastic pieces remain, carefully pull them off the timer shaft with pliers or needle-nose pliers. Some knobs have a small set screw behind a cap — check and remove that if present. Once exposed, try to turn the bare shaft with pliers: a healthy shaft will turn and click through detents. If it turns smoothly and the shaft splines look intact, a replacement knob will likely fix it. If the shaft is rounded or slips, you’ll need the timer assembly replaced.
Can I use a universal knob or do I need an OEM part?
You can use a universal knob if it matches the shaft profile (common options are splined or D-shaped shafts). Measure the shaft type and diameter before buying. Universal knobs are inexpensive and often work fine. However, if the timer shaft is damaged or the timer itself is faulty, buying only a knob will not fix the underlying issue — in that case replace the OEM timer assembly for reliable operation.
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.