Roper RED45 Dryer — Timer Knob Broken Off — What Part Fixes This?
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Understanding the Problem
A broken or missing timer knob on a Roper RED45 dryer usually means either the plastic knob itself failed or there is damage to the timer shaft or shaft adapter. In many cases the knob simply snapped off due to age, impact, or repeated force. If the internal splines of the knob or shaft are stripped, the knob will spin freely and the timer won't advance or the dryer may not start on selected cycles. Sometimes the visible knob is the only part that needs replacement — a direct-fit replacement knob restores control if the timer shaft is undamaged. If the shaft is bent, the splines are worn, or an internal retaining clip/adapter is broken, you'll need the shaft adapter or the entire timer/control assembly. Always disconnect power before inspecting and be prepared to order the correct part using the dryer model and serial tag information to ensure compatibility.
Common Symptoms
Knob missing or spins freely; timer won’t advance or cycle; dryer won’t start or stops mid-cycle; visible broken plastic on the control shaft.
Common Causes
- Plastic knob cracked or snapped from impact, age, or excessive force
- Stripped or damaged splines on the timer shaft or adapter
- Broken/loose shaft adapter or retaining clip inside the control assembly
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
Unplug the dryer, pop off the old knob (pull straight out) and inspect the exposed shaft: if the metal/plastic splines on the shaft are intact you only need a replacement knob; if the shaft splines are rounded, broken, or the shaft wobbles you’ll need the shaft adapter or full timer assembly.
Frequently Asked Questions
Can I glue the broken knob back on as a temporary fix?
You can use glue as a very short-term emergency fix only if the shaft and splines are undamaged and you just need to turn the control gently. Glue will not restore stripped splines or a broken adapter and will fail with repeated use. For a reliable repair, replace the knob or the damaged adapter/timer assembly.
How do I order the correct replacement knob or timer for my RED45?
Locate the model and serial tag (usually behind the dryer door or on the back). Take a clear photo of the control shaft after removing the broken knob so you can see splines or shaft shape (D-shaft or spline). Use the model/serial with the shaft photo when ordering parts from appliance parts suppliers to ensure you get the correct knob, adapter, or timer assembly.
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