Roper Dryer Timer Knob Broken — What Part Fixes It?
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Understanding the Problem
If the knob on your Roper dryer has snapped off the timer, the dryer control may still function but is difficult or impossible to operate. The visible plastic knob often fails before the underlying timer because knobs are thin molded plastic that wear or crack after repeated use. In many cases the knob itself or the small plastic adapter that mates the knob to the timer shaft is the failed component and is a simple, inexpensive fix. However, a broken knob can also indicate a damaged timer shaft (stripped spline), a missing or broken retaining clip, or internal timer damage. If the knob simply slipped off or the adapter is stripped, replacing the knob or adapter will restore operation. If the timer shaft is damaged or the timer is not responding properly (cycles incorrectly, no continuity), you may need to replace the entire timer assembly.
Common Symptoms
Knob falls off or spins freely; inability to change timer settings; intermittent or no timer response; loose or missing retaining clip behind knob.
Common Causes
- Plastic knob snapped or internal adapter stripped from repeated use or impact
- Retaining clip, washer, or boss that holds the knob in place is broken or missing
- Timer shaft spline is rounded/stripped or the timer mechanism is internally damaged
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
Confirm whether the plastic knob or the metal/plastic shaft is damaged by removing the control panel and inspecting the timer shaft; measure the spline shape (D, square, or flatted) or take a clear photo to match the replacement.
Frequently Asked Questions
How do I remove the broken knob and check what's actually damaged?
Unplug the dryer and pull it away from the wall. Access the control by removing the control panel or console screws (locations vary by model); you may need to tip the console forward. Once open, you can see the timer shaft. If any stump of the plastic knob remains, gently pry it off. Inspect the shaft for a dishwasher-shaped or D-shaped spline, cracked plastic adapter, or missing retaining clip. If the shaft spline is intact and only the knob or adapter is damaged, replace that smaller part. If the spline is rounded or the timer doesn’t make contact, replace the timer assembly.
Can I use a universal knob replacement and how much does it cost?
Yes — universal dryer knobs are available cheaply (typically $5–$20) but you must match the spline shape (D, square, round with flat) and diameter. Universal kits sometimes include multiple adapters. If internal timer damage exists, a replacement timer is more expensive (commonly $50–$200 depending on model). Always confirm your dryer model number (on the tag inside the door or on the back) before ordering a part.
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