Roper Dryer Knob Broken Off Timer – What Part Fixes This Problem?
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Understanding the Problem
When a timer knob breaks off on a Roper dryer you may still see the metal timer shaft but cannot turn it by hand, or the shaft itself may be rounded or damaged so a new knob won't fit. The failure can be limited to the plastic knob (cheap and easy to replace) or it can indicate damage to the timer shaft or the internal timer assembly (requires more work and a model-specific part). Fixing the right component depends on whether the splined shaft is intact and whether the timer still functions electrically.
Common Symptoms
Missing or snapped plastic knob; knob spins without turning the timer; timer shaft shows stripped or broken splines; dryer won't start, won't change cycles, or timer won’t advance.
Common Causes
- Plastic knob fatigue or impact break — common with age and repeated use
- Stripped or broken timer shaft splines so knob cannot engage
- Internal timer/mechanical failure causing shaft to separate or seize
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
Before ordering parts, check the dryer model tag (usually inside the door opening or on the back) and measure the shaft: note shaft diameter and whether it has a flat or splines. If the metal shaft splines look rounded or stripped, you’ll need the timer or a replacement shaft/adapter — not just a knob.
Frequently Asked Questions
Can I glue the broken knob back on?
Gluing is only a temporary fix and rarely reliable. Epoxy or superglue may hold the plastic to the shaft briefly, but it won’t restore proper engagement with splines and can fail under normal use. If the shaft is intact, replace the knob with a correct-fit replacement. If the shaft is damaged, replace the adapter or the timer assembly.
Is this a DIY repair or should I call a technician?
Replacing a plastic knob is an easy DIY job: unplug the dryer, pull the old knob off (or remove remaining pieces), and push on the new knob. Replacing a knob adapter or the timer assembly is intermediate: you’ll need basic hand tools, to remove the dryer console/control panel, and to disconnect wiring. If you’re not comfortable working near live wiring or removing the control panel, or if the timer needs electrical testing/replacement, call a qualified appliance technician. Always unplug the dryer before working on controls.
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