Why Is My August Smart Lock Pro Jammed?

Problem Description

Your August Home August Smart Lock Pro is not locking or unlocking reliably when commanded. A smart lock that does not respond correctly creates a security concern and undermines the convenience of keyless entry that the August Smart Lock Pro is designed to provide. Specifically, the issue involves jammed. The steps below walk you through diagnosing the root cause and applying proven fixes so your August Smart Lock Pro works reliably again.

Why This Happens in Real Homes

Like other August locks, a Smart Lock Pro jam is the deadbolt binding rather than a bad motor — the Pro turns your existing thumbturn, so a misaligned strike, a swollen door, or a stiff bolt stops it partway and triggers a jam alert. It has plenty of torque when the bolt moves freely.

Check the deadbolt throws smoothly by hand into an aligned strike with the door closed; fix the strike alignment, address a sagging door, and lubricate a dry mechanism. Confirm the adapter grips the thumbturn firmly and fit fresh AA batteries, then recalibrate so the lock relearns the free travel. Once the bolt moves without resistance, the jams stop.

Symptoms

• Pro motor jams
• Bolt won't fully throw
• Grinds/strains
• Stops partway
• Jams locking or unlocking
• Reports a jam
• Intermittent jamming
• Struggles then stops

Recognize these? Here's what usually causes it.

Common Causes

• Deadbolt binding against a misaligned strike
• Door swollen or sagging
• Adapter slipping on the thumbturn
• Low batteries (low torque)
• Stiff/dry deadbolt
• Lock mounted off-square
• Calibration off
• Obstruction in the bolt path

Tools & Requirements

Step-by-Step Solution

1

Check for deadbolt misalignment

The Smart Lock Pro motor stalls when the deadbolt meets resistance. Close the door and try turning the deadbolt by hand using the thumb turn (with the lock removed or by reaching behind it). If the bolt is stiff, the strike plate is not aligned with the bolt. Loosen the strike plate screws, shift it until the bolt slides in with no resistance, and retighten. This is the cause in the majority of jammed lock cases.

2

Replace the batteries

The Smart Lock Pro uses four AA batteries. When voltage drops, the motor loses torque and jams under normal deadbolt resistance that it handled fine with fresh batteries. Replace all four batteries at once with quality alkaline batteries. In cold weather, batteries output less power — if the lock is on an exterior door exposed to freezing temperatures, lithium AA batteries maintain voltage better than alkaline in the cold.

Needed for this step

Duracell Coppertop Double AA Batteries with Pow...

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$19.47

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3

Lubricate the deadbolt mechanism

Insert graphite powder lubricant into the deadbolt keyhole and work it in by turning the key back and forth several times. Also apply graphite to the bolt itself where it slides into the door edge. Do not use WD-40, oil, or silicone spray — liquid lubricants attract dust and create a paste that eventually makes the jam worse. Graphite is dry and stays effective for months. You can buy it at any hardware store for a few dollars.

Needed for this step

Hillman 703185 Graphite Tube 3G, White Key Lock...

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$5.97

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4

Check the adapter connection

The Smart Lock Pro connects to the deadbolt thumb turn via a metal adapter. If the adapter is loose or worn, the motor turns but the bolt does not move — it sounds like a jam but is actually a slipping adapter. Remove the lock and check the adapter. It should grip the thumb turn firmly. If it is loose, try a different adapter from the included set, or wrap a small piece of tape around the thumb turn post to increase the grip surface.

5

Recalibrate after fixing the mechanical issue

After addressing alignment, lubrication, or adapter fit, recalibrate the lock in the August app: Lock Settings > Calibrate Lock. The motor needs to re-learn the exact rotation range for the now-properly-functioning deadbolt. Without recalibration, the motor may overshoot or undershoot, causing it to jam again even though the mechanical issue is fixed. Test the lock 5 times after calibration to confirm smooth operation.

Quick Solutions

Still having issues? This is usually the deeper cause below.

Need More Help? August Home Support

Note: The contact information below connects you directly to August Home's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.

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