How Does the SimpliSafe Extended Range Entry Sensor Work?
- Gap exceeds even the extended range
- Magnet and sensor misaligned
- Sensor out of base range
Problem Description
Your SimpliSafe Entry Sensor is not detecting or reporting sensor readings accurately. Inaccurate readings from the Entry Sensor can trigger false automations, miss important events, or provide misleading data about your home environment. Specifically, the issue involves extended. The steps below walk you through diagnosing the root cause and applying proven fixes so your Entry Sensor works reliably again.
Why This Happens in Real Homes
The Extended Entry Sensor exists for doors and windows where the sensor and magnet sit farther apart than the standard sensor allows — it tolerates a bigger gap. So if it's reading wrong, first confirm the gap is still within even the extended limit, and that the two halves are aligned.
Start by lining up the marked edges of the sensor and magnet and checking the closed gap is within spec, then confirm it's in base range with a good battery. Mounting on a part of the frame that flexes when the door moves is a subtle cause of intermittent open/close reports.
Symptoms
- Sensor reads open when closed
- Does not detect at the expected gap
- Inaccurate open/close
- Magnet too far
- False open alerts
- Will not pair
- Gap larger than standard
- Intermittent detection
Recognize these? Here's what usually causes it.
Common Causes
- Gap exceeds even the extended range
- Magnet and sensor misaligned
- Sensor out of base range
- Mounted on a flexing part
- Battery low
- Marked edges not aligned
- Wrong sensor type for the gap
- Interference
Most fixes happen in the first 3 steps.
Always notify your monitoring provider before performing system tests to prevent dispatching emergency services unnecessarily. Never disable your security system for extended periods. If you smell gas or suspect a real emergency call 911 directly rather than relying on your smart system.
Tools & Requirements
These tools will help you complete this fix.
Ethernet cable
Jadaol Cat 6 Ethernet Cable 25 ft, 10Gbps Support Ca...
Replacement batteries
Duracell Coppertop Double AA Batteries with Power Bo...
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Step-by-Step Solution
Understand the entry sensor extended version
The SimpliSafe Entry Sensor Extended has a longer magnet separation distance than the standard entry sensor — up to 2 inches instead of about 1 inch. This makes it better for doors and windows with wider gaps, recessed frames, or non-standard trim. If your standard entry sensors keep showing as open when the door is closed, the extended version solves the gap problem.
Install the sensor and magnet
Peel the adhesive backing and attach the sensor body to the door or window frame. Attach the magnet to the moving part (the door or window itself). The magnet and sensor must be aligned — the SimpliSafe logo on both pieces should face the same direction. The extended sensor tolerates more misalignment than the standard, but proper alignment still gives the most reliable detection.
Test the sensor after installation
In the SimpliSafe app or on the keypad, check the sensor status. Open and close the door or window. The app should show the sensor changing between open and closed in real time. If it stays showing open when the door is closed, the magnet is too far from the sensor. Reposition the magnet closer. If it shows closed when the door is open, the sensor and magnet are too close together or aligned incorrectly.
Handle doors that warp or shift
Wooden doors expand and contract with humidity and temperature changes. A sensor that works perfectly in summer may have too wide a gap in winter (or vice versa). The extended sensor handles this better due to its wider detection range, but extreme warping can still exceed even the extended range. If the gap changes by more than half an inch seasonally, consider adjusting the magnet position for the worst-case gap.
Use for non-standard installations
The extended entry sensor works on sliding doors, garage service doors, and windows with deep frames. For sliding doors, mount the sensor on the frame and the magnet on the sliding panel. For deep window frames, mount the sensor on the inner frame and the magnet on the window sash. The extended range handles the larger gaps these installations create.
Quick Solutions
Still having issues? This is usually the deeper cause below.
If this comes back after following these steps, check whether a recent app or firmware update reset a default setting — the fix works, but the setting gets reverted silently.
Set up geofencing so your system arms automatically when everyone leaves home and disarms when the first person returns. This eliminates the chance of forgetting to arm the system and provides seamless daily security. **Product Intelligence:** - CR-2032 battery (2-3yr) - Magnet gap: up to 1 inch
This issue almost always looks more complex than it is — the majority of cases trace back to a single setting, a stale credential, or a default that shipped wrong.
- Gap exceeds even the extended range
- Magnet and sensor misaligned
- Sensor out of base range
- Mounted on a flexing part
- Battery low
Before you go — try one of these (they fix most cases).
Most popular upgrades chosen by SimpliSafe Entry Sensor owners.
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Official Manufacturer Manual
SimpliSafe provides official product documentation through their online manual rather than downloadable PDF. Access setup guides, troubleshooting steps, and product specifications for your SimpliSafe Entry Sensor.
Source: simplisafe.com
Need More Help? SimpliSafe Support
Note: The contact information below connects you directly to SimpliSafe's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.
How Does SimpliSafe Compare?
Before replacing your SimpliSafe device, see how it stacks up against alternatives in our full comparison guides.
Accessories owners commonly pair with SimpliSafe Entry Sensor.
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